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57903357ee
This only affects targets like Mips where branch instructions may kill virtual registers. Most other targets branch on flag values, so virtual registers are not involved. The problem is that MachineBasicBlock::updateTerminator deletes branches and inserts new ones while LiveVariables keeps a list of pointers to instructions that kill virtual registers. That list wasn't properly updated in MBB::SplitCriticalEdge. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132298 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.5 KiB
LLVM
44 lines
1.5 KiB
LLVM
; RUN: llc < %s -verify-coalescing
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; PR10046
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;
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; PHI elimination splits the critical edge from %while.end415 to %if.end427.
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; This requires updating the BNE-J terminators to a BEQ. The BNE instruction
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; kills a virtual register, and LiveVariables must be updated with the new kill
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; instruction.
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target datalayout = "E-p:32:32:32-i1:8:8-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-n32"
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target triple = "mips-ellcc-linux"
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define i32 @mergesort(i8* %base, i32 %nmemb, i32 %size, i32 (i8*, i8*)* nocapture %cmp) nounwind {
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entry:
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br i1 undef, label %return, label %if.end13
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if.end13: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body, %if.end13
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%list1.0482 = phi i8* [ %base, %if.end13 ], [ null, %while.body ]
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br i1 undef, label %while.end415, label %while.body
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while.end415: ; preds = %while.body
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br i1 undef, label %if.then419, label %if.end427
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if.then419: ; preds = %while.end415
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%call425 = tail call i8* @memmove(i8* %list1.0482, i8* undef, i32 undef) nounwind
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br label %if.end427
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if.end427: ; preds = %if.then419, %while.end415
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%list2.1 = phi i8* [ undef, %if.then419 ], [ %list1.0482, %while.end415 ]
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tail call void @free(i8* %list2.1)
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unreachable
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return: ; preds = %entry
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ret i32 -1
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}
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declare i8* @memmove(i8*, i8*, i32)
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declare void @free(i8*)
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