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Treat the ARM inline asm {cc} constraint as a physreg (%CPSR), just like X86

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does for {flags}. If we create virtual registers of the CCR class, RegAllocFast
may try to spill them, and we can't do that.

llvm-svn: 106289
This commit is contained in:
Jakob Stoklund Olesen 2010-06-18 16:49:33 +00:00
parent 0422fad3a6
commit 6c387d99ca
2 changed files with 13 additions and 1 deletions
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2
lib/Target/ARM/ARMISelLowering.cpp
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@ -4945,7 +4945,7 @@ ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
}
}
if (StringRef("{cc}").equals_lower(Constraint))
return std::make_pair(0U, ARM::CCRRegisterClass);
return std::make_pair(unsigned(ARM::CPSR), ARM::CCRRegisterClass);
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}

12
test/CodeGen/ARM/crash-O0.ll Normal file
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@ -0,0 +1,12 @@
; RUN: llc < %s -O0 -relocation-model=pic -disable-fp-elim
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64-n32"
target triple = "armv6-apple-darwin10"
%struct0 = type { i32, i32 }
; This function would crash RegAllocFast because it tried to spill %CPSR.
define arm_apcscc void @clobber_cc() nounwind noinline ssp {
entry:
%asmtmp = call %struct0 asm sideeffect "...", "=&r,=&r,r,Ir,r,~{cc},~{memory}"(i32* undef, i32 undef, i32 1) nounwind ; <%0> [#uses=0]
unreachable
}