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X86: cpuid and xgetbv write to 32-bit registers, not 64-bit 

This fixes an issue where MS inline assembly containing xgetbv wouldn't
be marked as clobbering EAX:EDX. Test for that forthcoming on the Clang
side.

llvm-svn: 217173
This commit is contained in:
Reid Kleckner 2014-09-04 16:58:25 +00:00
parent 8ae63c127d
commit aedf0d705f
1 changed files with 3 additions and 7 deletions
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10
llvm/lib/Target/X86/X86InstrSystem.td
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@ -462,11 +462,7 @@ def LMSW16m : I<0x01, MRM6m, (outs), (ins i16mem:$src),
"lmsw{w}\t$src", [], IIC_LMSW_REG>, TB;
let Defs = [EAX, EBX, ECX, EDX], Uses = [EAX, ECX] in
def CPUID32 : I<0xA2, RawFrm, (outs), (ins), "cpuid", [], IIC_CPUID>, TB,
Requires<[Not64BitMode]>;
let Defs = [RAX, RBX, RCX, RDX], Uses = [RAX, RCX] in
def CPUID64 : I<0xA2, RawFrm, (outs), (ins), "cpuid", [], IIC_CPUID>, TB,
Requires<[In64BitMode]>;
def CPUID : I<0xA2, RawFrm, (outs), (ins), "cpuid", [], IIC_CPUID>, TB;
} // SchedRW
//===----------------------------------------------------------------------===//
@ -479,10 +475,10 @@ def WBINVD : I<0x09, RawFrm, (outs), (ins), "wbinvd", [], IIC_INVD>, TB;
//===----------------------------------------------------------------------===//
// XSAVE instructions
let SchedRW = [WriteSystem] in {
let Defs = [RDX, RAX], Uses = [RCX] in
let Defs = [EDX, EAX], Uses = [ECX] in
def XGETBV : I<0x01, MRM_D0, (outs), (ins), "xgetbv", []>, TB;
let Uses = [RDX, RAX, RCX] in
let Uses = [EDX, EAX, ECX] in
def XSETBV : I<0x01, MRM_D1, (outs), (ins), "xsetbv", []>, TB;
let Uses = [RDX, RAX] in {