mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 20:23:11 +01:00
46 lines
1.0 KiB
LLVM
46 lines
1.0 KiB
LLVM
; RUN: opt -mem2reg < %s -S | FileCheck %s
|
|
; RUN: opt -passes=mem2reg < %s -S | FileCheck %s
|
|
|
|
declare i32 @def(i32)
|
|
declare i1 @use(i32)
|
|
|
|
; Special case of a single-BB alloca does not apply here since the load
|
|
; is affected by the following store. Expect this case to be identified
|
|
; and a PHI node to be created.
|
|
define void @test1() {
|
|
; CHECK-LABEL: @test1(
|
|
entry:
|
|
%t = alloca i32
|
|
br label %loop
|
|
|
|
loop:
|
|
%v = load i32, i32* %t
|
|
%c = call i1 @use(i32 %v)
|
|
; CHECK: [[PHI:%.*]] = phi i32 [ undef, %entry ], [ %n, %loop ]
|
|
; CHECK: call i1 @use(i32 [[PHI]])
|
|
%n = call i32 @def(i32 7)
|
|
store i32 %n, i32* %t
|
|
br i1 %c, label %loop, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
; Same as above, except there is no following store. The alloca should just be
|
|
; replaced with an undef
|
|
define void @test2() {
|
|
; CHECK-LABEL: @test2(
|
|
entry:
|
|
%t = alloca i32
|
|
br label %loop
|
|
|
|
loop:
|
|
%v = load i32, i32* %t
|
|
%c = call i1 @use(i32 %v)
|
|
; CHECK: %c = call i1 @use(i32 undef)
|
|
br i1 %c, label %loop, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|