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Post process ADC/SBB and use a shorter encoding if they use a sign extended immediate.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177243 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2013-03-18 03:34:55 +00:00
parent 4bef961baf
commit 8ee1c1cfaf
2 changed files with 20 additions and 0 deletions
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6
lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -1801,6 +1801,12 @@ processInstruction(MCInst &Inst,
case X86::SUB16i16: return convert16i16to16ri8(Inst, X86::SUB16ri8);
case X86::SUB32i32: return convert32i32to32ri8(Inst, X86::SUB32ri8);
case X86::SUB64i32: return convert64i32to64ri8(Inst, X86::SUB64ri8);
case X86::ADC16i16: return convert16i16to16ri8(Inst, X86::ADC16ri8);
case X86::ADC32i32: return convert32i32to32ri8(Inst, X86::ADC32ri8);
case X86::ADC64i32: return convert64i32to64ri8(Inst, X86::ADC64ri8);
case X86::SBB16i16: return convert16i16to16ri8(Inst, X86::SBB16ri8);
case X86::SBB32i32: return convert32i32to32ri8(Inst, X86::SBB32ri8);
case X86::SBB64i32: return convert64i32to64ri8(Inst, X86::SBB64ri8);
}
}

14
test/MC/X86/intel-syntax-encoding.s
View File

@ -31,6 +31,20 @@
// CHECK: encoding: [0x48,0x83,0xc0,0xf4]
add rax, -12
// CHECK: encoding: [0x66,0x83,0xd0,0xf4]
adc ax, -12
// CHECK: encoding: [0x83,0xd0,0xf4]
adc eax, -12
// CHECK: encoding: [0x48,0x83,0xd0,0xf4]
adc rax, -12
// CHECK: encoding: [0x66,0x83,0xd8,0xf4]
sbb ax, -12
// CHECK: encoding: [0x83,0xd8,0xf4]
sbb eax, -12
// CHECK: encoding: [0x48,0x83,0xd8,0xf4]
sbb rax, -12
// CHECK: encoding: [0x66,0x83,0xf8,0xf4]
cmp ax, -12
// CHECK: encoding: [0x83,0xf8,0xf4]