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https://github.com/c64scene-ar/llvm-6502.git
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f1a60c734c
both fallthrough and a conditional branch target the same successor. Gracefully delete the conditional branch and introduce any unconditional branch needed to reach the actual successor. This fixes memory corruption in 2009-06-15-RegScavengerAssert.ll and possibly other tests. Also, while I'm here fix a latent bug I spotted by inspection. I never applied the same fundamental fix to this fallthrough successor finding logic that I did to the logic used when there are no conditional branches. As a consequence it would have selected landing pads had they be aligned in just the right way here. I don't have a test case as I spotted this by inspection, and the previous time I found this required have of TableGen's source code to produce it. =/ I hate backend bugs. ;] Thanks to Jim Grosbach for helping me reason through this and reviewing the fix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154867 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
792 B
LLVM
21 lines
792 B
LLVM
; RUN: llc -march=x86-64 < %s | FileCheck %s
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; CHECK: orq
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; CHECK-NEXT: .LBB0_1
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@_ZN11xercesc_2_513SchemaSymbols21fgURI_SCHEMAFORSCHEMAE = external constant [33 x i16], align 32 ; <[33 x i16]*> [#uses=1]
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@_ZN11xercesc_2_56XMLUni16fgNotationStringE = external constant [9 x i16], align 16 ; <[9 x i16]*> [#uses=1]
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define fastcc void @foo() {
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entry:
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br i1 icmp eq (i64 or (i64 ptrtoint ([33 x i16]* @_ZN11xercesc_2_513SchemaSymbols21fgURI_SCHEMAFORSCHEMAE to i64),
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i64 ptrtoint ([9 x i16]* @_ZN11xercesc_2_56XMLUni16fgNotationStringE to i64)), i64 0),
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label %bb8.i329, label %bb4.i.i318.preheader
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bb4.i.i318.preheader: ; preds = %bb6
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unreachable
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bb8.i329: ; preds = %bb6
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unreachable
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}
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