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

llvm-svn: 177243

diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 5f6c110..4ed5534 100644 (file)
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -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);
   }
 }
 

diff --git a/llvm/test/MC/X86/intel-syntax-encoding.s b/llvm/test/MC/X86/intel-syntax-encoding.s
index 1350364..9806ac3 100644 (file)
--- a/llvm/test/MC/X86/intel-syntax-encoding.s
+++ b/llvm/test/MC/X86/intel-syntax-encoding.s
@@ -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]