51ff04567b
After investigation by @asbirlea, the issue that caused the
revert appears to be an issue in the original source, rather
than a problem with the compiler.
This patch enables MemorySSA DSE again.
This reverts commit 915310bf14.
41 lines
876 B
LLVM
41 lines
876 B
LLVM
; RUN: opt -basic-aa -dse -S < %s | FileCheck %s
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
|
|
|
%t = type { i32 }
|
|
|
|
@g = global i32 42
|
|
|
|
define void @test1(%t* noalias %pp) {
|
|
%p = getelementptr inbounds %t, %t* %pp, i32 0, i32 0
|
|
|
|
store i32 1, i32* %p; <-- This is dead
|
|
%x = load i32, i32* inttoptr (i32 12345 to i32*)
|
|
store i32 %x, i32* %p
|
|
ret void
|
|
; CHECK-LABEL: define void @test1(
|
|
; CHECK: store
|
|
; CHECK-NOT: store
|
|
; CHECK: ret void
|
|
}
|
|
|
|
define void @test3() {
|
|
store i32 1, i32* @g; <-- This is dead.
|
|
store i32 42, i32* @g
|
|
ret void
|
|
; CHECK-LABEL: define void @test3(
|
|
; CHECK: store
|
|
; CHECK-NOT: store
|
|
; CHECK: ret void
|
|
}
|
|
|
|
define void @test4(i32* %p) {
|
|
store i32 1, i32* %p
|
|
%x = load i32, i32* @g; <-- %p and @g could alias
|
|
store i32 %x, i32* %p
|
|
ret void
|
|
; CHECK-LABEL: define void @test4(
|
|
; CHECK: store
|
|
; CHECK: store
|
|
; CHECK: ret void
|
|
}
|