/
phi.ll
197 lines (178 loc) · 4.55 KB
/
phi.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
; PR12189
define i1 @test1(i32 %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: br i1 true, label [[A:%.*]], label [[B:%.*]]
; CHECK: a:
; CHECK-NEXT: [[AA:%.*]] = or i32 [[X:%.*]], 10
; CHECK-NEXT: br label [[C:%.*]]
; CHECK: b:
; CHECK-NEXT: [[BB:%.*]] = or i32 [[X]], 10
; CHECK-NEXT: br label [[C]]
; CHECK: c:
; CHECK-NEXT: [[CC:%.*]] = phi i32 [ [[BB]], [[B]] ], [ [[AA]], [[A]] ]
; CHECK-NEXT: [[D:%.*]] = urem i32 [[CC]], 2
; CHECK-NEXT: [[E:%.*]] = icmp eq i32 [[D]], 0
; CHECK-NEXT: ret i1 [[E]]
;
br i1 true, label %a, label %b
a:
%aa = or i32 %x, 10
br label %c
b:
%bb = or i32 %x, 10
br label %c
c:
%cc = phi i32 [ %bb, %b ], [%aa, %a ]
%d = urem i32 %cc, 2
%e = icmp eq i32 %d, 0
ret i1 %e
}
; D63489 - https://reviews.llvm.org/D63489
; If this single-value phi form needs to be preserved to enable
; further analysis, then -passes=instsimplify should not be running?
define i32 @lcssa-phi(i32 %x) {
; CHECK-LABEL: @lcssa-phi(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret i32 [[X:%.*]]
;
entry:
br label %end
end:
%counter.lcssa = phi i32 [ %x, %entry ]
ret i32 %counter.lcssa
}
define i32 @poison(i1 %cond, i32 %v) {
; CHECK-LABEL: @poison(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i32 [[V:%.*]]
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%w = phi i32 [%v, %A], [poison, %B]
ret i32 %w
}
define i32 @undef(i1 %cond, i32 %v) {
; CHECK-LABEL: @undef(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i32 [[V:%.*]]
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%w = phi i32 [%v, %A], [undef, %B]
ret i32 %w
}
define i8 @undef_poison(i1 %cond) {
; CHECK-LABEL: @undef_poison(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 undef
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [undef, %A], [poison, %B]
ret i8 %r
}
define i8 @only_undef(i1 %cond) {
; CHECK-LABEL: @only_undef(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 undef
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [undef, %A], [undef, %B]
ret i8 %r
}
define i8 @only_poison(i1 %cond) {
; CHECK-LABEL: @only_poison(
; CHECK-NEXT: br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: EXIT:
; CHECK-NEXT: ret i8 undef
;
br i1 %cond, label %A, label %B
A:
br label %EXIT
B:
br label %EXIT
EXIT:
%r = phi i8 [poison, %A], [poison, %B]
ret i8 %r
}
@g = extern_weak global i32
define i64 @pr49839_with_poison(i1 %c) {
; CHECK-LABEL: @pr49839_with_poison(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[JOIN:%.*]]
; CHECK: if:
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: [[PHI:%.*]] = phi i64 [ poison, [[IF]] ], [ srem (i64 1, i64 ptrtoint (i32* @g to i64)), [[ENTRY:%.*]] ]
; CHECK-NEXT: ret i64 [[PHI]]
;
entry:
br i1 %c, label %if, label %join
if:
br label %join
join:
%phi = phi i64 [ poison, %if ], [ srem (i64 1, i64 ptrtoint (i32* @g to i64)) , %entry ]
ret i64 %phi
}
define i64 @pr49839_without_poison(i1 %c) {
; CHECK-LABEL: @pr49839_without_poison(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[JOIN:%.*]]
; CHECK: if:
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: ret i64 srem (i64 1, i64 ptrtoint (i32* @g to i64))
;
entry:
br i1 %c, label %if, label %join
if:
br label %join
join:
%phi = phi i64 [ srem (i64 1, i64 ptrtoint (i32* @g to i64)), %if ], [ srem (i64 1, i64 ptrtoint (i32* @g to i64)) , %entry ]
ret i64 %phi
}