mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 19:52:54 +01:00
cf7665b0c8
generates store to undef and some generates store to null as the idiom for undefined behavior. Since simplifycfg zaps both, don't remove the undefined behavior in instcombine. llvm-svn: 89971
86 lines
1.7 KiB
LLVM
86 lines
1.7 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
define void @test1(i32* %P) {
|
|
store i32 undef, i32* %P
|
|
store i32 123, i32* undef
|
|
store i32 124, i32* null
|
|
ret void
|
|
; CHECK: @test1(
|
|
; CHECK-NEXT: store i32 123, i32* undef
|
|
; CHECK-NEXT: store i32 undef, i32* null
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
define void @test2(i32* %P) {
|
|
%X = load i32* %P ; <i32> [#uses=1]
|
|
%Y = add i32 %X, 0 ; <i32> [#uses=1]
|
|
store i32 %Y, i32* %P
|
|
ret void
|
|
; CHECK: @test2
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
;; Simple sinking tests
|
|
|
|
; "if then else"
|
|
define i32 @test3(i1 %C) {
|
|
%A = alloca i32
|
|
br i1 %C, label %Cond, label %Cond2
|
|
|
|
Cond:
|
|
store i32 -987654321, i32* %A
|
|
br label %Cont
|
|
|
|
Cond2:
|
|
store i32 47, i32* %A
|
|
br label %Cont
|
|
|
|
Cont:
|
|
%V = load i32* %A
|
|
ret i32 %V
|
|
; CHECK: @test3
|
|
; CHECK-NOT: alloca
|
|
; CHECK: Cont:
|
|
; CHECK-NEXT: %storemerge = phi i32 [ 47, %Cond2 ], [ -987654321, %Cond ]
|
|
; CHECK-NEXT: ret i32 %storemerge
|
|
}
|
|
|
|
; "if then"
|
|
define i32 @test4(i1 %C) {
|
|
%A = alloca i32
|
|
store i32 47, i32* %A
|
|
br i1 %C, label %Cond, label %Cont
|
|
|
|
Cond:
|
|
store i32 -987654321, i32* %A
|
|
br label %Cont
|
|
|
|
Cont:
|
|
%V = load i32* %A
|
|
ret i32 %V
|
|
; CHECK: @test4
|
|
; CHECK-NOT: alloca
|
|
; CHECK: Cont:
|
|
; CHECK-NEXT: %storemerge = phi i32 [ -987654321, %Cond ], [ 47, %0 ]
|
|
; CHECK-NEXT: ret i32 %storemerge
|
|
}
|
|
|
|
; "if then"
|
|
define void @test5(i1 %C, i32* %P) {
|
|
store i32 47, i32* %P, align 1
|
|
br i1 %C, label %Cond, label %Cont
|
|
|
|
Cond:
|
|
store i32 -987654321, i32* %P, align 1
|
|
br label %Cont
|
|
|
|
Cont:
|
|
ret void
|
|
; CHECK: @test5
|
|
; CHECK: Cont:
|
|
; CHECK-NEXT: %storemerge = phi i32
|
|
; CHECK-NEXT: store i32 %storemerge, i32* %P, align 1
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|