mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-14 04:57:33 +00:00
a4bdf2ea48
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121945 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
2.2 KiB
LLVM
92 lines
2.2 KiB
LLVM
; RUN: opt -tbaa -basicaa -gvn -S < %s | FileCheck %s
|
|
|
|
target datalayout = "e-p:64:64:64"
|
|
|
|
; GVN should ignore the store to p1 to see that the load from p is
|
|
; fully redundant.
|
|
|
|
; CHECK: @yes
|
|
; CHECK: if.then:
|
|
; CHECK-NEXT: store i32 0, i32* %q
|
|
; CHECK-NEXT: ret void
|
|
|
|
define void @yes(i1 %c, i32* %p, i32* %p1, i32* %q) nounwind {
|
|
entry:
|
|
store i32 0, i32* %p, !tbaa !1
|
|
store i32 1, i32* %p1, !tbaa !2
|
|
br i1 %c, label %if.else, label %if.then
|
|
|
|
if.then:
|
|
%t = load i32* %p, !tbaa !1
|
|
store i32 %t, i32* %q
|
|
ret void
|
|
|
|
if.else:
|
|
ret void
|
|
}
|
|
|
|
; GVN should ignore the store to p1 to see that the first load from p is
|
|
; fully redundant. However, the second load uses a different type. Theoretically
|
|
; the other type could be unified with the first type, however for now, GVN
|
|
; should just be conservative.
|
|
|
|
; CHECK: @watch_out_for_type_change
|
|
; CHECK: if.then:
|
|
; CHECK: %t = load i32* %p
|
|
; CHECK: store i32 %t, i32* %q
|
|
; CHECK: ret void
|
|
; CHECK: if.else:
|
|
; CHECK: %u = load i32* %p
|
|
; CHECK: store i32 %u, i32* %q
|
|
|
|
define void @watch_out_for_type_change(i1 %c, i32* %p, i32* %p1, i32* %q) nounwind {
|
|
entry:
|
|
store i32 0, i32* %p, !tbaa !1
|
|
store i32 1, i32* %p1, !tbaa !2
|
|
br i1 %c, label %if.else, label %if.then
|
|
|
|
if.then:
|
|
%t = load i32* %p, !tbaa !4
|
|
store i32 %t, i32* %q
|
|
ret void
|
|
|
|
if.else:
|
|
%u = load i32* %p, !tbaa !3
|
|
store i32 %u, i32* %q
|
|
ret void
|
|
}
|
|
|
|
; As before, but the types are swapped. This time GVN does managed to
|
|
; eliminate one of the loads before noticing the type mismatch.
|
|
|
|
; CHECK: @watch_out_for_another_type_change
|
|
; CHECK: if.then:
|
|
; CHECK: %t = load i32* %p
|
|
; CHECK: store i32 %t, i32* %q
|
|
; CHECK: ret void
|
|
; CHECK: if.else:
|
|
; CHECK: store i32 0, i32* %q
|
|
|
|
define void @watch_out_for_another_type_change(i1 %c, i32* %p, i32* %p1, i32* %q) nounwind {
|
|
entry:
|
|
store i32 0, i32* %p, !tbaa !1
|
|
store i32 1, i32* %p1, !tbaa !2
|
|
br i1 %c, label %if.else, label %if.then
|
|
|
|
if.then:
|
|
%t = load i32* %p, !tbaa !3
|
|
store i32 %t, i32* %q
|
|
ret void
|
|
|
|
if.else:
|
|
%u = load i32* %p, !tbaa !4
|
|
store i32 %u, i32* %q
|
|
ret void
|
|
}
|
|
|
|
!0 = metadata !{}
|
|
!1 = metadata !{metadata !"red", metadata !0}
|
|
!2 = metadata !{metadata !"blu", metadata !0}
|
|
!3 = metadata !{metadata !"outer space"}
|
|
!4 = metadata !{metadata !"brick red", metadata !1}
|