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Fix fast-isel to not emit invalid assembly when presented with a

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constant shift count that doesn't fit in the shift instruction's
immediate field. This fixes PR3242.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61281 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-12-20 17:19:40 +00:00
parent edf22b97d0
commit b12b1a27f5
2 changed files with 8 additions and 1 deletions
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2
lib/Target/X86/X86FastISel.cpp
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@ -893,7 +893,7 @@ bool X86FastISel::X86SelectShift(Instruction *I) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
unsigned ResultReg = createResultReg(RC);
BuildMI(MBB, TII.get(OpImm),
ResultReg).addReg(Op0Reg).addImm(CI->getZExtValue());
ResultReg).addReg(Op0Reg).addImm(CI->getZExtValue() & 0xff);
UpdateValueMap(I, ResultReg);
return true;
}

7
test/CodeGen/X86/fast-isel-shift-imm.ll Normal file
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@ -0,0 +1,7 @@
; RUN: llvm-as < %s | llc -march=x86 -fast | grep {sarl \$80, %eax}
; PR3242
define i32 @foo(i32 %x) nounwind {
%y = ashr i32 %x, 50000
ret i32 %y
}