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signed-mul-overflow-check-via-mul-sdiv.ll
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signed-mul-overflow-check-via-mul-sdiv.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; Fold
; ((%x * %y) s/ %x) != %y
; to
; @llvm.smul.with.overflow(%x, %y) + extractvalue
define i1 @t0_basic(i8 %x, i8 %y) {
; CHECK-LABEL: @t0_basic(
; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.smul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1
; CHECK-NEXT: ret i1 [[MUL_OV]]
;
%t0 = mul i8 %x, %y
%t1 = sdiv i8 %t0, %x
%r = icmp ne i8 %t1, %y
ret i1 %r
}
define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @t1_vec(
; CHECK-NEXT: [[MUL:%.*]] = call { <2 x i8>, <2 x i1> } @llvm.smul.with.overflow.v2i8(<2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]])
; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { <2 x i8>, <2 x i1> } [[MUL]], 1
; CHECK-NEXT: ret <2 x i1> [[MUL_OV]]
;
%t0 = mul <2 x i8> %x, %y
%t1 = sdiv <2 x i8> %t0, %x
%r = icmp ne <2 x i8> %t1, %y
ret <2 x i1> %r
}
declare i8 @gen8()
define i1 @t2_commutative(i8 %x) {
; CHECK-LABEL: @t2_commutative(
; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.smul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y]])
; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1
; CHECK-NEXT: ret i1 [[MUL_OV]]
;
%y = call i8 @gen8()
%t0 = mul i8 %y, %x ; swapped
%t1 = sdiv i8 %t0, %x
%r = icmp ne i8 %t1, %y
ret i1 %r
}
define i1 @t3_commutative(i8 %x) {
; CHECK-LABEL: @t3_commutative(
; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.smul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y]])
; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1
; CHECK-NEXT: ret i1 [[MUL_OV]]
;
%y = call i8 @gen8()
%t0 = mul i8 %y, %x ; swapped
%t1 = sdiv i8 %t0, %x
%r = icmp ne i8 %t1, %y
ret i1 %r
}
define i1 @t4_commutative(i8 %x) {
; CHECK-LABEL: @t4_commutative(
; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.smul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y]])
; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1
; CHECK-NEXT: ret i1 [[MUL_OV]]
;
%y = call i8 @gen8()
%t0 = mul i8 %y, %x ; swapped
%t1 = sdiv i8 %t0, %x
%r = icmp ne i8 %y, %t1 ; swapped
ret i1 %r
}
; Extra-use tests
declare void @use8(i8)
define i1 @t5_extrause0(i8 %x, i8 %y) {
; CHECK-LABEL: @t5_extrause0(
; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.smul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
; CHECK-NEXT: [[MUL_VAL:%.*]] = extractvalue { i8, i1 } [[MUL]], 0
; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1
; CHECK-NEXT: call void @use8(i8 [[MUL_VAL]])
; CHECK-NEXT: ret i1 [[MUL_OV]]
;
%t0 = mul i8 %x, %y
call void @use8(i8 %t0)
%t1 = sdiv i8 %t0, %x
%r = icmp ne i8 %t1, %y
ret i1 %r
}
define i1 @t6_extrause1(i8 %x, i8 %y) {
; CHECK-LABEL: @t6_extrause1(
; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = sdiv i8 [[T0]], [[X]]
; CHECK-NEXT: call void @use8(i8 [[T1]])
; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
; CHECK-NEXT: ret i1 [[R]]
;
%t0 = mul i8 %x, %y
%t1 = sdiv i8 %t0, %x
call void @use8(i8 %t1)
%r = icmp ne i8 %t1, %y
ret i1 %r
}
define i1 @t7_extrause2(i8 %x, i8 %y) {
; CHECK-LABEL: @t7_extrause2(
; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = sdiv i8 [[T0]], [[X]]
; CHECK-NEXT: call void @use8(i8 [[T1]])
; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
; CHECK-NEXT: ret i1 [[R]]
;
%t0 = mul i8 %x, %y
call void @use8(i8 %t0)
%t1 = sdiv i8 %t0, %x
call void @use8(i8 %t1)
%r = icmp ne i8 %t1, %y
ret i1 %r
}
; Negative tests
define i1 @n8_different_x(i8 %x0, i8 %x1, i8 %y) {
; CHECK-LABEL: @n8_different_x(
; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X0:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = sdiv i8 [[T0]], [[X1:%.*]]
; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
; CHECK-NEXT: ret i1 [[R]]
;
%t0 = mul i8 %x0, %y
%t1 = sdiv i8 %t0, %x1
%r = icmp ne i8 %t1, %y
ret i1 %r
}
define i1 @n9_different_y(i8 %x, i8 %y0, i8 %y1) {
; CHECK-LABEL: @n9_different_y(
; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y0:%.*]]
; CHECK-NEXT: [[T1:%.*]] = sdiv i8 [[T0]], [[X]]
; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y1:%.*]]
; CHECK-NEXT: ret i1 [[R]]
;
%t0 = mul i8 %x, %y0
%t1 = sdiv i8 %t0, %x
%r = icmp ne i8 %t1, %y1
ret i1 %r
}
define i1 @n10_wrong_pred(i8 %x, i8 %y) {
; CHECK-LABEL: @n10_wrong_pred(
; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = sdiv i8 [[T0]], [[X]]
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[T1]], [[Y]]
; CHECK-NEXT: ret i1 [[R]]
;
%t0 = mul i8 %x, %y
%t1 = sdiv i8 %t0, %x
%r = icmp ugt i8 %t1, %y
ret i1 %r
}