mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-02 07:11:49 +00:00
7ec1829823
The bug was introduced in r225282. r225282 assumed that sub X, Y is the same as add X, -Y. This is not correct if we are going to upgrade the sub to sub nuw. This change fixes the issue by making the optimization ignore sub instructions. Differential Revision: http://reviews.llvm.org/D6979 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226075 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.6 KiB
LLVM
47 lines
1.6 KiB
LLVM
; RUN: opt -indvars -S < %s | FileCheck %s
|
|
|
|
@b = common global i32 0, align 4
|
|
@c = common global i32 0, align 4
|
|
@a = common global i32 0, align 4
|
|
|
|
declare void @abort() #1
|
|
|
|
; Function Attrs: nounwind ssp uwtable
|
|
define i32 @main() {
|
|
entry:
|
|
%a.promoted13 = load i32* @a, align 4
|
|
br label %for.cond1.preheader
|
|
|
|
for.cond1.preheader: ; preds = %entry, %for.end
|
|
%or.lcssa14 = phi i32 [ %a.promoted13, %entry ], [ %or.lcssa, %for.end ]
|
|
%d.010 = phi i32 [ 1, %entry ], [ 0, %for.end ]
|
|
br label %for.body3
|
|
|
|
for.body3: ; preds = %for.cond1.preheader, %for.body3
|
|
%inc12 = phi i32 [ 0, %for.cond1.preheader ], [ %inc, %for.body3 ]
|
|
%or11 = phi i32 [ %or.lcssa14, %for.cond1.preheader ], [ %or, %for.body3 ]
|
|
; CHECK-NOT: sub nuw i32 %inc12, %d.010
|
|
; CHECK: sub i32 %inc12, %d.010
|
|
%add = sub i32 %inc12, %d.010
|
|
%or = or i32 %or11, %add
|
|
%inc = add i32 %inc12, 1
|
|
br i1 false, label %for.body3, label %for.end
|
|
|
|
for.end: ; preds = %for.body3
|
|
%or.lcssa = phi i32 [ %or, %for.body3 ]
|
|
br i1 false, label %for.cond1.preheader, label %for.end6
|
|
|
|
for.end6: ; preds = %for.end
|
|
%or.lcssa.lcssa = phi i32 [ %or.lcssa, %for.end ]
|
|
store i32 %or.lcssa.lcssa, i32* @a, align 4
|
|
%cmp7 = icmp eq i32 %or.lcssa.lcssa, -1
|
|
br i1 %cmp7, label %if.end, label %if.then
|
|
|
|
if.then: ; preds = %for.end6
|
|
tail call void @abort() #2
|
|
unreachable
|
|
|
|
if.end: ; preds = %for.end6
|
|
ret i32 0
|
|
}
|