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fix PR4767, a crash because fp stackifier visited blocks in

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depth first order, so it wouldn't process unreachable blocks.
When compiling at -O0, late dead block elimination isn't done
and the bad instructions got to isel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-09-08 04:55:44 +00:00
parent 687bc9bfde
commit ba3598cb1f
2 changed files with 38 additions and 0 deletions
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8
lib/Target/X86/X86FloatingPoint.cpp
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@ -213,6 +213,14 @@ bool FPS::runOnMachineFunction(MachineFunction &MF) {
I != E; ++I)
Changed |= processBasicBlock(MF, **I);
// Process any unreachable blocks in arbitrary order now.
if (MF.size() == Processed.size())
return Changed;
for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
if (Processed.insert(BB))
Changed |= processBasicBlock(MF, *BB);
return Changed;
}

30
test/CodeGen/X86/fp-stack-O0-crash.ll Normal file
View File

@ -0,0 +1,30 @@
; RUN: llc %s -O0 -fast-isel -regalloc=local -o -
; PR4767
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-f80:128:128"
target triple = "i386-apple-darwin10"
define void @fn(x86_fp80 %x) nounwind ssp {
entry:
%x.addr = alloca x86_fp80 ; <x86_fp80*> [#uses=5]
store x86_fp80 %x, x86_fp80* %x.addr
br i1 false, label %cond.true, label %cond.false
cond.true: ; preds = %entry
%tmp = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
%tmp1 = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
%cmp = fcmp oeq x86_fp80 %tmp, %tmp1 ; <i1> [#uses=1]
br i1 %cmp, label %if.then, label %if.end
cond.false: ; preds = %entry
%tmp2 = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
%tmp3 = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
%cmp4 = fcmp une x86_fp80 %tmp2, %tmp3 ; <i1> [#uses=1]
br i1 %cmp4, label %if.then, label %if.end
if.then: ; preds = %cond.false, %cond.true
br label %if.end
if.end: ; preds = %if.then, %cond.false, %cond.true
ret void
}