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https://github.com/c64scene-ar/llvm-6502.git
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2622f4622c
edited during emission. If the basic block ends in a switch that gets lowered to a jump table, any phis at the default edge were getting updated wrong. The jump table data structure keeps a pointer to the header blocks that wasn't getting updated after the MBB is split. This bug was exposed on 32-bit Linux when disabling critical edge splitting in codegen prepare. The fix is to uipdate stale MBB pointers whenever a block is split during emission. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115191 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.9 KiB
LLVM
72 lines
2.9 KiB
LLVM
; RUN: llc -verify-machineinstrs -cgp-critical-edge-splitting=0 -mcpu=i386 < %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
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target triple = "i386-pc-linux-gnu"
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; The bb.i basic block gets split while emitting the schedule because
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; -mcpu=i386 doesn't have CMOV.'
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;
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; That causes the PHI to be updated wrong because the jumptable data structure is remembering the original MBB.
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;
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; -cgp-critical-edge-splitting=0 prevents the edge to PHI from being split.
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@.str146 = external constant [4 x i8], align 1
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@.str706 = external constant [4 x i8], align 1
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@.str1189 = external constant [5 x i8], align 1
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declare i32 @memcmp(i8* nocapture, i8* nocapture, i32) nounwind readonly
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declare i32 @strlen(i8* nocapture) nounwind readonly
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define hidden zeroext i8 @f(i8* %this, i8* %Name.0, i32 %Name.1, i8* noalias %NameLoc, i8* %Operands) nounwind align 2 {
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bb.i:
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%0 = icmp eq i8 undef, 0
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%iftmp.285.0 = select i1 %0, i8* getelementptr inbounds ([5 x i8]* @.str1189, i32 0, i32 0), i8* getelementptr inbounds ([4 x i8]* @.str706, i32 0, i32 0)
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%1 = call i32 @strlen(i8* %iftmp.285.0) nounwind readonly
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switch i32 %Name.1, label %_ZNK4llvm12StringSwitchINS_9StringRefES1_E7DefaultERKS1_.exit [
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i32 3, label %bb1.i
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i32 4, label %bb1.i1237
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i32 5, label %bb1.i1266
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i32 6, label %bb1.i1275
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i32 2, label %bb1.i1434
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i32 8, label %bb1.i1523
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i32 7, label %bb1.i1537
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]
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bb1.i: ; preds = %bb.i
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unreachable
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bb1.i1237: ; preds = %bb.i
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br i1 undef, label %bb.i1820, label %bb1.i1241
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bb1.i1241: ; preds = %bb1.i1237
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unreachable
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bb1.i1266: ; preds = %bb.i
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unreachable
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bb1.i1275: ; preds = %bb.i
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unreachable
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bb1.i1434: ; preds = %bb.i
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unreachable
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bb1.i1523: ; preds = %bb.i
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unreachable
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bb1.i1537: ; preds = %bb.i
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unreachable
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bb.i1820: ; preds = %bb1.i1237
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br label %_ZNK4llvm12StringSwitchINS_9StringRefES1_E7DefaultERKS1_.exit
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_ZNK4llvm12StringSwitchINS_9StringRefES1_E7DefaultERKS1_.exit: ; preds = %bb.i1820, %bb.i
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%PatchedName.0.0 = phi i8* [ undef, %bb.i1820 ], [ %Name.0, %bb.i ]
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br i1 undef, label %bb141, label %_ZNK4llvm9StringRef10startswithES0_.exit
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_ZNK4llvm9StringRef10startswithES0_.exit: ; preds = %_ZNK4llvm12StringSwitchINS_9StringRefES1_E7DefaultERKS1_.exit
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%2 = call i32 @memcmp(i8* %PatchedName.0.0, i8* getelementptr inbounds ([4 x i8]* @.str146, i32 0, i32 0), i32 3) nounwind readonly
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unreachable
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bb141: ; preds = %_ZNK4llvm12StringSwitchINS_9StringRefES1_E7DefaultERKS1_.exit
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unreachable
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}
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