6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-04-11 00:39:36 +00:00
Code Issues Projects Releases Wiki Activity

Fixed bug when custom lowering DEC64m on x86.

Browse Source 
If the DEC node had more than one user, it was doing this lowering but
leaving the original DEC node around and so decrementing twice.

Fixes PR11964.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150356 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper 2012-02-13 00:10:03 +00:00
parent 2ee746b87d
commit ce3900849a
2 changed files with 25 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -2378,6 +2378,7 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
Chain->getOpcode() != ISD::LOAD ||
StoredVal->getOpcode() != X86ISD::DEC ||
StoredVal.getResNo() != 0 ||
!StoredVal.getNode()->hasNUsesOfValue(1, 0) ||
StoredVal->getOperand(0).getNode() != Chain.getNode())
break;

24
test/CodeGen/X86/dec-eflags-lower.ll
View File

@ -2,6 +2,7 @@
%struct.obj = type { i64 }
; CHECK: _Z7releaseP3obj
define void @_Z7releaseP3obj(%struct.obj* nocapture %o) nounwind uwtable ssp {
entry:
; CHECK: decq (%{{rdi|rcx}})
@ -22,8 +23,31 @@ return: ; preds = %entry, %if.end
ret void
}
@c = common global i64 0, align 8
@a = common global i32 0, align 4
@.str = private unnamed_addr constant [5 x i8] c"%ld\0A\00", align 1
@b = common global i32 0, align 4
; CHECK: test
define i32 @test() nounwind uwtable ssp {
entry:
; CHECK: decq
; CHECK-NOT: decq
%0 = load i64* @c, align 8, !tbaa !0
%dec.i = add nsw i64 %0, -1
store i64 %dec.i, i64* @c, align 8, !tbaa !0
%tobool.i = icmp ne i64 %dec.i, 0
%lor.ext.i = zext i1 %tobool.i to i32
store i32 %lor.ext.i, i32* @a, align 4, !tbaa !3
%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([5 x i8]* @.str, i64 0, i64 0), i64 %dec.i) nounwind
ret i32 0
}
declare i32 @printf(i8* nocapture, ...) nounwind
declare void @free(i8* nocapture) nounwind
!0 = metadata !{metadata !"long", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
!3 = metadata !{metadata !"int", metadata !1}