mirror of
https://github.com/c64scene-ar/llvm-6502.git
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e064ab5798
Note, this is a recommit of r236515 after fixing an error in r236514. The buildbot ran fast enough that it picked up r236514 prior to r236515 and threw an error. r236515 itself ran 'make check' without errors. Original commit message follows: A regmask (typically seen on a call) clobbers the set of registers it lists. The IfConverter, in UpdatePredRedefs, was handling register defs, but not regmasks. These are slightly different to a def in that we need to add both an implicit use and def to appease the machine verifier. Otherwise, uses after the if converted call could think they are reading an undefined register. Reviewed by Matthias Braun and Quentin Colombet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236550 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
1.6 KiB
LLVM
46 lines
1.6 KiB
LLVM
; RUN: llc %s -o - -verify-machineinstrs | FileCheck %s
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target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
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target triple = "thumbv7s-apple-ios8.0.0"
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@debw = external global i8*, align 4
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; This test ensures that the stack_chk call correctly puts implicit uses/defs for the regsiters
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; live across it when if converting. This will be R0 which is passed to the call to free at the end
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; of the function.
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; Prior to this change, the stack_chk call (which does not return) would clobber R0 in its regmask,
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; leading to verifier errors because the later use of R0 in free() is not live.
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; CHECK-LABEL: @test
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; CHECK: stack_chk_fail
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; Function Attrs: ssp
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define void @test(i32 %argc, i8** nocapture readonly %argv, i32* %ptr, i32 %val) #0 {
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entry:
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%count.i = alloca [256 x i32], align 4
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%cmp284.i = icmp eq i32 %val, 0
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br i1 %cmp284.i, label %for.end31.i, label %for.body21.i
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for.body21.i: ; preds = %entry
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%arrayidx23.i = getelementptr inbounds [256 x i32], [256 x i32]* %count.i, i32 0, i32 1
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%tmp20 = load i32, i32* %arrayidx23.i, align 4, !tbaa !0
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store i32 %tmp20, i32* %ptr, align 4, !tbaa !0
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br label %for.end31.i
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for.end31.i: ; preds = %for.body21.i, %entry
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%tmp21 = load i8*, i8** @debw, align 4, !tbaa !4
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tail call void @free(i8* %tmp21)
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ret void
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}
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declare void @free(i8* nocapture)
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attributes #0 = { ssp "stack-protector-buffer-size"="8" }
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!0 = !{!1, !1, i64 0}
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!1 = !{!"int", !2, i64 0}
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!2 = !{!"omnipotent char", !3, i64 0}
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!3 = !{!"Simple C/C++ TBAA"}
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!4 = !{!5, !5, i64 0}
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!5 = !{!"any pointer", !2, i64 0}
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