/
saturating-add-sub.ll
1699 lines (1542 loc) · 58.4 KB
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saturating-add-sub.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -instcombine-infinite-loop-threshold=2 -S | FileCheck %s
;
; Saturating addition.
;
declare i8 @llvm.uadd.sat.i8(i8, i8)
declare i8 @llvm.sadd.sat.i8(i8, i8)
declare <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8>, <2 x i8>)
declare <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8>, <2 x i8>)
; Constant uadd argument is canonicalized to the right.
define i8 @test_scalar_uadd_canonical(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_canonical(
; CHECK-NEXT: [[X:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[A:%.*]], i8 10)
; CHECK-NEXT: ret i8 [[X]]
;
%x = call i8 @llvm.uadd.sat.i8(i8 10, i8 %a)
ret i8 %x
}
define <2 x i8> @test_vector_uadd_canonical(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_canonical(
; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 10, i8 20>)
; CHECK-NEXT: ret <2 x i8> [[X]]
;
%x = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> <i8 10, i8 20>, <2 x i8> %a)
ret <2 x i8> %x
}
; Constant sadd argument is canonicalized to the right.
define i8 @test_scalar_sadd_canonical(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_canonical(
; CHECK-NEXT: [[X:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 -10)
; CHECK-NEXT: ret i8 [[X]]
;
%x = call i8 @llvm.sadd.sat.i8(i8 -10, i8 %a)
ret i8 %x
}
define <2 x i8> @test_vector_sadd_canonical(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_canonical(
; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 10, i8 -20>)
; CHECK-NEXT: ret <2 x i8> [[X]]
;
%x = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> <i8 10, i8 -20>, <2 x i8> %a)
ret <2 x i8> %x
}
; Can combine uadds with constant operands.
define i8 @test_scalar_uadd_combine(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_combine(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[A:%.*]], i8 30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%x1 = call i8 @llvm.uadd.sat.i8(i8 %a, i8 10)
%x2 = call i8 @llvm.uadd.sat.i8(i8 %x1, i8 20)
ret i8 %x2
}
define <2 x i8> @test_vector_uadd_combine(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_combine(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 30, i8 30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%x1 = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 10>)
%x2 = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %x1, <2 x i8> <i8 20, i8 20>)
ret <2 x i8> %x2
}
; This could simplify, but currently doesn't.
define <2 x i8> @test_vector_uadd_combine_non_splat(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_combine_non_splat(
; CHECK-NEXT: [[X1:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 10, i8 20>)
; CHECK-NEXT: [[X2:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[X1]], <2 x i8> <i8 30, i8 40>)
; CHECK-NEXT: ret <2 x i8> [[X2]]
;
%x1 = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 20>)
%x2 = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %x1, <2 x i8> <i8 30, i8 40>)
ret <2 x i8> %x2
}
; Can combine uadds even if they overflow.
define i8 @test_scalar_uadd_overflow(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_overflow(
; CHECK-NEXT: ret i8 -1
;
%y1 = call i8 @llvm.uadd.sat.i8(i8 %a, i8 100)
%y2 = call i8 @llvm.uadd.sat.i8(i8 %y1, i8 200)
ret i8 %y2
}
define <2 x i8> @test_vector_uadd_overflow(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_overflow(
; CHECK-NEXT: ret <2 x i8> <i8 -1, i8 -1>
;
%y1 = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 100, i8 100>)
%y2 = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %y1, <2 x i8> <i8 200, i8 200>)
ret <2 x i8> %y2
}
; Can combine sadds if sign matches.
define i8 @test_scalar_sadd_both_positive(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_both_positive(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%z1 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 10)
%z2 = call i8 @llvm.sadd.sat.i8(i8 %z1, i8 20)
ret i8 %z2
}
define <2 x i8> @test_vector_sadd_both_positive(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_both_positive(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 30, i8 30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%z1 = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 10>)
%z2 = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %z1, <2 x i8> <i8 20, i8 20>)
ret <2 x i8> %z2
}
define i8 @test_scalar_sadd_both_negative(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_both_negative(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 -30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%u1 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 -10)
%u2 = call i8 @llvm.sadd.sat.i8(i8 %u1, i8 -20)
ret i8 %u2
}
define <2 x i8> @test_vector_sadd_both_negative(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_both_negative(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -30, i8 -30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%u1 = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 -10, i8 -10>)
%u2 = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %u1, <2 x i8> <i8 -20, i8 -20>)
ret <2 x i8> %u2
}
; Can't combine sadds if constants have different sign.
define i8 @test_scalar_sadd_different_sign(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_different_sign(
; CHECK-NEXT: [[V1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 10)
; CHECK-NEXT: [[V2:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[V1]], i8 -20)
; CHECK-NEXT: ret i8 [[V2]]
;
%v1 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 10)
%v2 = call i8 @llvm.sadd.sat.i8(i8 %v1, i8 -20)
ret i8 %v2
}
; Can't combine sadds if they overflow.
define i8 @test_scalar_sadd_overflow(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_overflow(
; CHECK-NEXT: [[W1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 100)
; CHECK-NEXT: [[W2:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[W1]], i8 100)
; CHECK-NEXT: ret i8 [[W2]]
;
%w1 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 100)
%w2 = call i8 @llvm.sadd.sat.i8(i8 %w1, i8 100)
ret i8 %w2
}
; neg uadd neg always overflows.
define i8 @test_scalar_uadd_neg_neg(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_neg_neg(
; CHECK-NEXT: ret i8 -1
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.uadd.sat.i8(i8 %a_neg, i8 -10)
ret i8 %r
}
define <2 x i8> @test_vector_uadd_neg_neg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_neg_neg(
; CHECK-NEXT: ret <2 x i8> <i8 -1, i8 -1>
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 -10, i8 -20>)
ret <2 x i8> %r
}
; nneg uadd nneg never overflows.
define i8 @test_scalar_uadd_nneg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_nneg_nneg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and i8 [[A:%.*]], 127
; CHECK-NEXT: [[R:%.*]] = add nuw i8 [[A_NNEG]], 10
; CHECK-NEXT: ret i8 [[R]]
;
%a_nneg = and i8 %a, 127
%r = call i8 @llvm.uadd.sat.i8(i8 %a_nneg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_uadd_nneg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_nneg_nneg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and <2 x i8> [[A:%.*]], <i8 127, i8 127>
; CHECK-NEXT: [[R:%.*]] = add nuw <2 x i8> [[A_NNEG]], <i8 10, i8 20>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_nneg = and <2 x i8> %a, <i8 127, i8 127>
%r = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a_nneg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
; neg uadd nneg might overflow.
define i8 @test_scalar_uadd_neg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or i8 [[A:%.*]], -128
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[A_NEG]], i8 10)
; CHECK-NEXT: ret i8 [[R]]
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.uadd.sat.i8(i8 %a_neg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_uadd_neg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or <2 x i8> [[A:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[A_NEG]], <2 x i8> <i8 10, i8 20>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
define i8 @test_scalar_uadd_never_overflows(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_never_overflows(
; CHECK-NEXT: [[A_MASKED:%.*]] = and i8 [[A:%.*]], -127
; CHECK-NEXT: [[R:%.*]] = add nuw nsw i8 [[A_MASKED]], 1
; CHECK-NEXT: ret i8 [[R]]
;
%a_masked = and i8 %a, 129
%r = call i8 @llvm.uadd.sat.i8(i8 %a_masked, i8 1)
ret i8 %r
}
define <2 x i8> @test_vector_uadd_never_overflows(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_never_overflows(
; CHECK-NEXT: [[A_MASKED:%.*]] = and <2 x i8> [[A:%.*]], <i8 -127, i8 -127>
; CHECK-NEXT: [[R:%.*]] = add nuw nsw <2 x i8> [[A_MASKED]], <i8 1, i8 1>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_masked = and <2 x i8> %a, <i8 129, i8 129>
%r = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a_masked, <2 x i8> <i8 1, i8 1>)
ret <2 x i8> %r
}
define i8 @test_scalar_uadd_always_overflows(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_always_overflows(
; CHECK-NEXT: ret i8 -1
;
%a_masked = or i8 %a, 192
%r = call i8 @llvm.uadd.sat.i8(i8 %a_masked, i8 64)
ret i8 %r
}
define <2 x i8> @test_vector_uadd_always_overflows(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_uadd_always_overflows(
; CHECK-NEXT: ret <2 x i8> <i8 -1, i8 -1>
;
%a_masked = or <2 x i8> %a, <i8 192, i8 192>
%r = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a_masked, <2 x i8> <i8 64, i8 64>)
ret <2 x i8> %r
}
; neg sadd nneg never overflows.
define i8 @test_scalar_sadd_neg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or i8 [[A:%.*]], -128
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[A_NEG]], 10
; CHECK-NEXT: ret i8 [[R]]
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.sadd.sat.i8(i8 %a_neg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_sadd_neg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or <2 x i8> [[A:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[R:%.*]] = add nsw <2 x i8> [[A_NEG]], <i8 10, i8 20>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
; nneg sadd neg never overflows.
define i8 @test_scalar_sadd_nneg_neg(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_nneg_neg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and i8 [[A:%.*]], 127
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[A_NNEG]], -10
; CHECK-NEXT: ret i8 [[R]]
;
%a_nneg = and i8 %a, 127
%r = call i8 @llvm.sadd.sat.i8(i8 %a_nneg, i8 -10)
ret i8 %r
}
define <2 x i8> @test_vector_sadd_nneg_neg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_nneg_neg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and <2 x i8> [[A:%.*]], <i8 127, i8 127>
; CHECK-NEXT: [[R:%.*]] = add nsw <2 x i8> [[A_NNEG]], <i8 -10, i8 -20>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_nneg = and <2 x i8> %a, <i8 127, i8 127>
%r = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a_nneg, <2 x i8> <i8 -10, i8 -20>)
ret <2 x i8> %r
}
; neg sadd neg might overflow.
define i8 @test_scalar_sadd_neg_neg(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_neg_neg(
; CHECK-NEXT: [[A_NEG:%.*]] = or i8 [[A:%.*]], -128
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A_NEG]], i8 -10)
; CHECK-NEXT: ret i8 [[R]]
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.sadd.sat.i8(i8 %a_neg, i8 -10)
ret i8 %r
}
define <2 x i8> @test_vector_sadd_neg_neg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_neg_neg(
; CHECK-NEXT: [[A_NEG:%.*]] = or <2 x i8> [[A:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A_NEG]], <2 x i8> <i8 -10, i8 -20>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 -10, i8 -20>)
ret <2 x i8> %r
}
define i8 @test_scalar_sadd_always_overflows_low(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_always_overflows_low(
; CHECK-NEXT: ret i8 -128
;
%cmp = icmp slt i8 %a, -120
%min = select i1 %cmp, i8 %a, i8 -120
%r = call i8 @llvm.sadd.sat.i8(i8 %min, i8 -10)
ret i8 %r
}
define i8 @test_scalar_sadd_always_overflows_high(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_always_overflows_high(
; CHECK-NEXT: ret i8 127
;
%cmp = icmp sgt i8 %a, 120
%max = select i1 %cmp, i8 %a, i8 120
%r = call i8 @llvm.sadd.sat.i8(i8 %max, i8 10)
ret i8 %r
}
; While this is a no-overflow condition, the nuw flag gets lost due to
; canonicalization and we can no longer determine this
define i8 @test_scalar_uadd_sub_nuw_lost_no_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_sub_nuw_lost_no_ov(
; CHECK-NEXT: [[B:%.*]] = add i8 [[A:%.*]], -10
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[B]], i8 9)
; CHECK-NEXT: ret i8 [[R]]
;
%b = sub nuw i8 %a, 10
%r = call i8 @llvm.uadd.sat.i8(i8 %b, i8 9)
ret i8 %r
}
define i8 @test_scalar_uadd_urem_no_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_urem_no_ov(
; CHECK-NEXT: [[B:%.*]] = urem i8 [[A:%.*]], 100
; CHECK-NEXT: [[R:%.*]] = add nuw nsw i8 [[B]], -100
; CHECK-NEXT: ret i8 [[R]]
;
%b = urem i8 %a, 100
%r = call i8 @llvm.uadd.sat.i8(i8 %b, i8 156)
ret i8 %r
}
define i8 @test_scalar_uadd_urem_may_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_uadd_urem_may_ov(
; CHECK-NEXT: [[B:%.*]] = urem i8 [[A:%.*]], 100
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[B]], i8 -99)
; CHECK-NEXT: ret i8 [[R]]
;
%b = urem i8 %a, 100
%r = call i8 @llvm.uadd.sat.i8(i8 %b, i8 157)
ret i8 %r
}
; We have a constant range for the LHS, but only known bits for the RHS
define i8 @test_scalar_uadd_udiv_known_bits(i8 %a, i8 %b) {
; CHECK-LABEL: @test_scalar_uadd_udiv_known_bits(
; CHECK-NEXT: [[AA:%.*]] = udiv i8 -66, [[A:%.*]]
; CHECK-NEXT: [[BB:%.*]] = and i8 [[B:%.*]], 63
; CHECK-NEXT: [[R:%.*]] = add nuw i8 [[AA]], [[BB]]
; CHECK-NEXT: ret i8 [[R]]
;
%aa = udiv i8 190, %a
%bb = and i8 %b, 63
%r = call i8 @llvm.uadd.sat.i8(i8 %aa, i8 %bb)
ret i8 %r
}
define i8 @test_scalar_sadd_srem_no_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_srem_no_ov(
; CHECK-NEXT: [[B:%.*]] = srem i8 [[A:%.*]], 100
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[B]], 28
; CHECK-NEXT: ret i8 [[R]]
;
%b = srem i8 %a, 100
%r = call i8 @llvm.sadd.sat.i8(i8 %b, i8 28)
ret i8 %r
}
define i8 @test_scalar_sadd_srem_may_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_srem_may_ov(
; CHECK-NEXT: [[B:%.*]] = srem i8 [[A:%.*]], 100
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[B]], i8 29)
; CHECK-NEXT: ret i8 [[R]]
;
%b = srem i8 %a, 100
%r = call i8 @llvm.sadd.sat.i8(i8 %b, i8 29)
ret i8 %r
}
define i8 @test_scalar_sadd_srem_and_no_ov(i8 %a, i8 %b) {
; CHECK-LABEL: @test_scalar_sadd_srem_and_no_ov(
; CHECK-NEXT: [[AA:%.*]] = srem i8 [[A:%.*]], 100
; CHECK-NEXT: [[BB:%.*]] = and i8 [[B:%.*]], 15
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[AA]], [[BB]]
; CHECK-NEXT: ret i8 [[R]]
;
%aa = srem i8 %a, 100
%bb = and i8 %b, 15
%r = call i8 @llvm.sadd.sat.i8(i8 %aa, i8 %bb)
ret i8 %r
}
;
; Saturating subtraction.
;
declare i8 @llvm.usub.sat.i8(i8, i8)
declare i8 @llvm.ssub.sat.i8(i8, i8)
declare <2 x i8> @llvm.usub.sat.v2i8(<2 x i8>, <2 x i8>)
declare <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8>, <2 x i8>)
; Cannot canonicalize usub to uadd.
define i8 @test_scalar_usub_canonical(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_canonical(
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 10)
; CHECK-NEXT: ret i8 [[R]]
;
%r = call i8 @llvm.usub.sat.i8(i8 %a, i8 10)
ret i8 %r
}
; Canonicalize ssub to sadd.
define i8 @test_scalar_ssub_canonical(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_canonical(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 -10)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%r = call i8 @llvm.ssub.sat.i8(i8 %a, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_ssub_canonical(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_canonical(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -10, i8 -10>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%r = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 10>)
ret <2 x i8> %r
}
define <2 x i8> @test_vector_ssub_canonical_min_non_splat(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_canonical_min_non_splat(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -10, i8 10>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%r = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 -10>)
ret <2 x i8> %r
}
; Cannot canonicalize signed min.
define i8 @test_scalar_ssub_canonical_min(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_canonical_min(
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[A:%.*]], i8 -128)
; CHECK-NEXT: ret i8 [[R]]
;
%r = call i8 @llvm.ssub.sat.i8(i8 %a, i8 -128)
ret i8 %r
}
define <2 x i8> @test_vector_ssub_canonical_min(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_canonical_min(
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -128, i8 -10>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%r = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 -128, i8 -10>)
ret <2 x i8> %r
}
; Can combine usubs with constant operands.
define i8 @test_scalar_usub_combine(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_combine(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%x1 = call i8 @llvm.usub.sat.i8(i8 %a, i8 10)
%x2 = call i8 @llvm.usub.sat.i8(i8 %x1, i8 20)
ret i8 %x2
}
define <2 x i8> @test_vector_usub_combine(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_combine(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 30, i8 30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%x1 = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 10>)
%x2 = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %x1, <2 x i8> <i8 20, i8 20>)
ret <2 x i8> %x2
}
; This could simplify, but currently doesn't.
define <2 x i8> @test_vector_usub_combine_non_splat(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_combine_non_splat(
; CHECK-NEXT: [[X1:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 10, i8 20>)
; CHECK-NEXT: [[X2:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[X1]], <2 x i8> <i8 30, i8 40>)
; CHECK-NEXT: ret <2 x i8> [[X2]]
;
%x1 = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 20>)
%x2 = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %x1, <2 x i8> <i8 30, i8 40>)
ret <2 x i8> %x2
}
; Can combine usubs even if they overflow.
define i8 @test_scalar_usub_overflow(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_overflow(
; CHECK-NEXT: ret i8 0
;
%y1 = call i8 @llvm.usub.sat.i8(i8 %a, i8 100)
%y2 = call i8 @llvm.usub.sat.i8(i8 %y1, i8 200)
ret i8 %y2
}
define <2 x i8> @test_vector_usub_overflow(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_overflow(
; CHECK-NEXT: ret <2 x i8> zeroinitializer
;
%y1 = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 100, i8 100>)
%y2 = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %y1, <2 x i8> <i8 200, i8 200>)
ret <2 x i8> %y2
}
; Can combine ssubs if sign matches.
define i8 @test_scalar_ssub_both_positive(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_both_positive(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 -30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%z1 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 10)
%z2 = call i8 @llvm.ssub.sat.i8(i8 %z1, i8 20)
ret i8 %z2
}
define <2 x i8> @test_vector_ssub_both_positive(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_both_positive(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -30, i8 -30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%z1 = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 10, i8 10>)
%z2 = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %z1, <2 x i8> <i8 20, i8 20>)
ret <2 x i8> %z2
}
define i8 @test_scalar_ssub_both_negative(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_both_negative(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%u1 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 -10)
%u2 = call i8 @llvm.ssub.sat.i8(i8 %u1, i8 -20)
ret i8 %u2
}
define <2 x i8> @test_vector_ssub_both_negative(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_both_negative(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 30, i8 30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%u1 = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 -10, i8 -10>)
%u2 = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %u1, <2 x i8> <i8 -20, i8 -20>)
ret <2 x i8> %u2
}
; Can't combine ssubs if constants have different sign.
define i8 @test_scalar_ssub_different_sign(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_different_sign(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 -10)
; CHECK-NEXT: [[TMP2:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[TMP1]], i8 20)
; CHECK-NEXT: ret i8 [[TMP2]]
;
%v1 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 10)
%v2 = call i8 @llvm.ssub.sat.i8(i8 %v1, i8 -20)
ret i8 %v2
}
; Can combine sadd and ssub with appropriate signs.
define i8 @test_scalar_sadd_ssub(i8 %a) {
; CHECK-LABEL: @test_scalar_sadd_ssub(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 30)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%v1 = call i8 @llvm.sadd.sat.i8(i8 10, i8 %a)
%v2 = call i8 @llvm.ssub.sat.i8(i8 %v1, i8 -20)
ret i8 %v2
}
define <2 x i8> @test_vector_sadd_ssub(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_sadd_ssub(
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -30, i8 -30>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%v1 = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> <i8 -10, i8 -10>, <2 x i8> %a)
%v2 = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %v1, <2 x i8> <i8 20, i8 20>)
ret <2 x i8> %v2
}
; Can't combine ssubs if they overflow.
define i8 @test_scalar_ssub_overflow(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_overflow(
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 -100)
; CHECK-NEXT: [[TMP2:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[TMP1]], i8 -100)
; CHECK-NEXT: ret i8 [[TMP2]]
;
%w1 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 100)
%w2 = call i8 @llvm.ssub.sat.i8(i8 %w1, i8 100)
ret i8 %w2
}
; nneg usub neg always overflows.
define i8 @test_scalar_usub_nneg_neg(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_nneg_neg(
; CHECK-NEXT: ret i8 0
;
%a_nneg = and i8 %a, 127
%r = call i8 @llvm.usub.sat.i8(i8 %a_nneg, i8 -10)
ret i8 %r
}
define <2 x i8> @test_vector_usub_nneg_neg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_nneg_neg(
; CHECK-NEXT: ret <2 x i8> zeroinitializer
;
%a_nneg = and <2 x i8> %a, <i8 127, i8 127>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a_nneg, <2 x i8> <i8 -10, i8 -20>)
ret <2 x i8> %r
}
; neg usub nneg never overflows.
define i8 @test_scalar_usub_neg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or i8 [[A:%.*]], -128
; CHECK-NEXT: [[R:%.*]] = add i8 [[A_NEG]], -10
; CHECK-NEXT: ret i8 [[R]]
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.usub.sat.i8(i8 %a_neg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_usub_neg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or <2 x i8> [[A:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[R:%.*]] = add <2 x i8> [[A_NEG]], <i8 -10, i8 -20>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
; nneg usub nneg never may overflow.
define i8 @test_scalar_usub_nneg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_nneg_nneg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and i8 [[A:%.*]], 127
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A_NNEG]], i8 10)
; CHECK-NEXT: ret i8 [[R]]
;
%a_nneg = and i8 %a, 127
%r = call i8 @llvm.usub.sat.i8(i8 %a_nneg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_usub_nneg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_nneg_nneg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and <2 x i8> [[A:%.*]], <i8 127, i8 127>
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A_NNEG]], <2 x i8> <i8 10, i8 20>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_nneg = and <2 x i8> %a, <i8 127, i8 127>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a_nneg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
define i8 @test_scalar_usub_never_overflows(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_never_overflows(
; CHECK-NEXT: [[A_MASKED:%.*]] = or i8 [[A:%.*]], 64
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[A_MASKED]], -10
; CHECK-NEXT: ret i8 [[R]]
;
%a_masked = or i8 %a, 64
%r = call i8 @llvm.usub.sat.i8(i8 %a_masked, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_usub_never_overflows(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_never_overflows(
; CHECK-NEXT: [[A_MASKED:%.*]] = or <2 x i8> [[A:%.*]], <i8 64, i8 64>
; CHECK-NEXT: [[R:%.*]] = add nsw <2 x i8> [[A_MASKED]], <i8 -10, i8 -10>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_masked = or <2 x i8> %a, <i8 64, i8 64>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a_masked, <2 x i8> <i8 10, i8 10>)
ret <2 x i8> %r
}
define i8 @test_scalar_usub_always_overflows(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_always_overflows(
; CHECK-NEXT: ret i8 0
;
%a_masked = and i8 %a, 64
%r = call i8 @llvm.usub.sat.i8(i8 %a_masked, i8 100)
ret i8 %r
}
define <2 x i8> @test_vector_usub_always_overflows(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_always_overflows(
; CHECK-NEXT: ret <2 x i8> zeroinitializer
;
%a_masked = and <2 x i8> %a, <i8 64, i8 64>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a_masked, <2 x i8> <i8 100, i8 100>)
ret <2 x i8> %r
}
; neg ssub neg never overflows.
define i8 @test_scalar_ssub_neg_neg(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_neg_neg(
; CHECK-NEXT: [[A_NEG:%.*]] = or i8 [[A:%.*]], -128
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[A_NEG]], 10
; CHECK-NEXT: ret i8 [[R]]
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.ssub.sat.i8(i8 %a_neg, i8 -10)
ret i8 %r
}
define <2 x i8> @test_vector_ssub_neg_neg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_neg_neg(
; CHECK-NEXT: [[A_NEG:%.*]] = or <2 x i8> [[A:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[R:%.*]] = add nsw <2 x i8> [[A_NEG]], <i8 10, i8 20>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 -10, i8 -20>)
ret <2 x i8> %r
}
; nneg ssub nneg never overflows.
define i8 @test_scalar_ssub_nneg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_nneg_nneg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and i8 [[A:%.*]], 127
; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[A_NNEG]], -10
; CHECK-NEXT: ret i8 [[R]]
;
%a_nneg = and i8 %a, 127
%r = call i8 @llvm.ssub.sat.i8(i8 %a_nneg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_ssub_nneg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_nneg_nneg(
; CHECK-NEXT: [[A_NNEG:%.*]] = and <2 x i8> [[A:%.*]], <i8 127, i8 127>
; CHECK-NEXT: [[R:%.*]] = add nsw <2 x i8> [[A_NNEG]], <i8 -10, i8 -20>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%a_nneg = and <2 x i8> %a, <i8 127, i8 127>
%r = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a_nneg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
; neg ssub nneg may overflow.
define i8 @test_scalar_ssub_neg_nneg(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or i8 [[A:%.*]], -128
; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A_NEG]], i8 -10)
; CHECK-NEXT: ret i8 [[TMP1]]
;
%a_neg = or i8 %a, -128
%r = call i8 @llvm.ssub.sat.i8(i8 %a_neg, i8 10)
ret i8 %r
}
define <2 x i8> @test_vector_ssub_neg_nneg(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_ssub_neg_nneg(
; CHECK-NEXT: [[A_NEG:%.*]] = or <2 x i8> [[A:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[TMP1:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A_NEG]], <2 x i8> <i8 -10, i8 -20>)
; CHECK-NEXT: ret <2 x i8> [[TMP1]]
;
%a_neg = or <2 x i8> %a, <i8 -128, i8 -128>
%r = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a_neg, <2 x i8> <i8 10, i8 20>)
ret <2 x i8> %r
}
define i8 @test_scalar_ssub_always_overflows_low(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_always_overflows_low(
; CHECK-NEXT: ret i8 -128
;
%cmp = icmp sgt i8 %a, 120
%max = select i1 %cmp, i8 %a, i8 120
%r = call i8 @llvm.ssub.sat.i8(i8 -10, i8 %max)
ret i8 %r
}
define i8 @test_scalar_ssub_always_overflows_high(i8 %a) {
; CHECK-LABEL: @test_scalar_ssub_always_overflows_high(
; CHECK-NEXT: ret i8 127
;
%cmp = icmp slt i8 %a, -120
%min = select i1 %cmp, i8 %a, i8 -120
%r = call i8 @llvm.ssub.sat.i8(i8 10, i8 %min)
ret i8 %r
}
define i8 @test_scalar_usub_add_nuw_no_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_add_nuw_no_ov(
; CHECK-NEXT: [[R:%.*]] = add i8 [[A:%.*]], 1
; CHECK-NEXT: ret i8 [[R]]
;
%b = add nuw i8 %a, 10
%r = call i8 @llvm.usub.sat.i8(i8 %b, i8 9)
ret i8 %r
}
define i8 @test_scalar_usub_add_nuw_eq(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_add_nuw_eq(
; CHECK-NEXT: ret i8 [[A:%.*]]
;
%b = add nuw i8 %a, 10
%r = call i8 @llvm.usub.sat.i8(i8 %b, i8 10)
ret i8 %r
}
define i8 @test_scalar_usub_add_nuw_may_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_add_nuw_may_ov(
; CHECK-NEXT: [[B:%.*]] = add nuw i8 [[A:%.*]], 10
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[B]], i8 11)
; CHECK-NEXT: ret i8 [[R]]
;
%b = add nuw i8 %a, 10
%r = call i8 @llvm.usub.sat.i8(i8 %b, i8 11)
ret i8 %r
}
define i8 @test_scalar_usub_urem_must_ov(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_urem_must_ov(
; CHECK-NEXT: ret i8 0
;
%b = urem i8 %a, 10
%r = call i8 @llvm.usub.sat.i8(i8 %b, i8 10)
ret i8 %r
}
; Like the previous case, the result is always zero here. However, as there's
; no actual overflow, we won't know about it.
define i8 @test_scalar_usub_urem_must_zero(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_urem_must_zero(
; CHECK-NEXT: [[B:%.*]] = urem i8 [[A:%.*]], 10
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[B]], i8 9)
; CHECK-NEXT: ret i8 [[R]]
;
%b = urem i8 %a, 10
%r = call i8 @llvm.usub.sat.i8(i8 %b, i8 9)
ret i8 %r
}
; We have a constant range for the LHS, but only known bits for the RHS
define i8 @test_scalar_usub_add_nuw_known_bits(i8 %a, i8 %b) {
; CHECK-LABEL: @test_scalar_usub_add_nuw_known_bits(
; CHECK-NEXT: [[AA:%.*]] = add nuw i8 [[A:%.*]], 10
; CHECK-NEXT: [[BB:%.*]] = and i8 [[B:%.*]], 7
; CHECK-NEXT: [[R:%.*]] = sub nuw i8 [[AA]], [[BB]]
; CHECK-NEXT: ret i8 [[R]]
;
%aa = add nuw i8 %a, 10
%bb = and i8 %b, 7
%r = call i8 @llvm.usub.sat.i8(i8 %aa, i8 %bb)
ret i8 %r
}
define i8 @test_scalar_usub_add_nuw_inferred(i8 %a) {
; CHECK-LABEL: @test_scalar_usub_add_nuw_inferred(
; CHECK-NEXT: [[B:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 10)
; CHECK-NEXT: [[R:%.*]] = add nuw i8 [[B]], 9
; CHECK-NEXT: ret i8 [[R]]
;
%b = call i8 @llvm.usub.sat.i8(i8 %a, i8 10)
%r = add i8 %b, 9
ret i8 %r
}
define <2 x i8> @test_vector_usub_add_nuw_no_ov(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_add_nuw_no_ov(
; CHECK-NEXT: [[R:%.*]] = add <2 x i8> [[A:%.*]], <i8 1, i8 1>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%b = add nuw <2 x i8> %a, <i8 10, i8 10>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %b, <2 x i8> <i8 9, i8 9>)
ret <2 x i8> %r
}
; Can be optimized if the usub.sat RHS constant range handles non-splat vectors.
define <2 x i8> @test_vector_usub_add_nuw_no_ov_nonsplat1(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_add_nuw_no_ov_nonsplat1(
; CHECK-NEXT: [[B:%.*]] = add nuw <2 x i8> [[A:%.*]], <i8 10, i8 10>
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[B]], <2 x i8> <i8 10, i8 9>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%b = add nuw <2 x i8> %a, <i8 10, i8 10>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %b, <2 x i8> <i8 10, i8 9>)
ret <2 x i8> %r
}
; Can be optimized if the add nuw RHS constant range handles non-splat vectors.
define <2 x i8> @test_vector_usub_add_nuw_no_ov_nonsplat2(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_add_nuw_no_ov_nonsplat2(
; CHECK-NEXT: [[B:%.*]] = add nuw <2 x i8> [[A:%.*]], <i8 10, i8 9>
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[B]], <2 x i8> <i8 9, i8 9>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%b = add nuw <2 x i8> %a, <i8 10, i8 9>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %b, <2 x i8> <i8 9, i8 9>)
ret <2 x i8> %r
}
; Can be optimized if constant range is tracked per-element.
define <2 x i8> @test_vector_usub_add_nuw_no_ov_nonsplat3(<2 x i8> %a) {
; CHECK-LABEL: @test_vector_usub_add_nuw_no_ov_nonsplat3(
; CHECK-NEXT: [[B:%.*]] = add nuw <2 x i8> [[A:%.*]], <i8 10, i8 9>
; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[B]], <2 x i8> <i8 10, i8 9>)
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%b = add nuw <2 x i8> %a, <i8 10, i8 9>
%r = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %b, <2 x i8> <i8 10, i8 9>)
ret <2 x i8> %r
}
define i8 @test_scalar_ssub_add_nsw_no_ov(i8 %a, i8 %b) {
; CHECK-LABEL: @test_scalar_ssub_add_nsw_no_ov(
; CHECK-NEXT: [[AA:%.*]] = add nsw i8 [[A:%.*]], 7
; CHECK-NEXT: [[BB:%.*]] = and i8 [[B:%.*]], 7
; CHECK-NEXT: [[R:%.*]] = sub nsw i8 [[AA]], [[BB]]
; CHECK-NEXT: ret i8 [[R]]
;
%aa = add nsw i8 %a, 7
%bb = and i8 %b, 7
%r = call i8 @llvm.ssub.sat.i8(i8 %aa, i8 %bb)
ret i8 %r
}
define i8 @test_scalar_ssub_add_nsw_may_ov(i8 %a, i8 %b) {
; CHECK-LABEL: @test_scalar_ssub_add_nsw_may_ov(
; CHECK-NEXT: [[AA:%.*]] = add nsw i8 [[A:%.*]], 6
; CHECK-NEXT: [[BB:%.*]] = and i8 [[B:%.*]], 7
; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[AA]], i8 [[BB]])
; CHECK-NEXT: ret i8 [[R]]
;
%aa = add nsw i8 %a, 6
%bb = and i8 %b, 7
%r = call i8 @llvm.ssub.sat.i8(i8 %aa, i8 %bb)
ret i8 %r
}
define <2 x i8> @test_vector_ssub_add_nsw_no_ov_splat(<2 x i8> %a, <2 x i8> %b) {
; CHECK-LABEL: @test_vector_ssub_add_nsw_no_ov_splat(
; CHECK-NEXT: [[AA:%.*]] = add nsw <2 x i8> [[A:%.*]], <i8 7, i8 7>
; CHECK-NEXT: [[BB:%.*]] = and <2 x i8> [[B:%.*]], <i8 7, i8 7>
; CHECK-NEXT: [[R:%.*]] = sub nsw <2 x i8> [[AA]], [[BB]]
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%aa = add nsw <2 x i8> %a, <i8 7, i8 7>