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Make %EFLAGS unallocatable.

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No CCR virtual registers should exist, and %EFLAGS is used in ways that can
surprise RegAllocFast.

llvm-svn: 112650
This commit is contained in:
Jakob Stoklund Olesen 2010-08-31 21:51:07 +00:00
parent 9fe6b84fb2
commit 7ffcddc113
1 changed files with 11 additions and 0 deletions
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11
lib/Target/X86/X86RegisterInfo.td
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@ -833,4 +833,15 @@ def VR256 : RegisterClass<"X86", [v32i8, v8i32, v4i64, v8f32, v4f64], 256,
// Status flags registers.
def CCR : RegisterClass<"X86", [i32], 32, [EFLAGS]> {
let CopyCost = -1; // Don't allow copying of status registers.
// EFLAGS is not allocatable.
let MethodProtos = [{
iterator allocation_order_end(const MachineFunction &MF) const;
}];
let MethodBodies = [{
CCRClass::iterator
CCRClass::allocation_order_end(const MachineFunction &MF) const {
return allocation_order_begin(MF);
}
}];
}