reapply r103668 with a fix. Never make "minor syntax changes"
after testing before committing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103681 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 460410b..2c227b9 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -622,6 +622,31 @@
return false;
}
+/// LowerMOffset - Lower an 'moffset' form of an instruction, which just has a
+/// imm operand, to having "rm" or "mr" operands with the offset in the disp
+/// field.
+static void LowerMOffset(MCInst &Inst, unsigned Opc, unsigned RegNo,
+ bool isMR) {
+ MCOperand Disp = Inst.getOperand(0);
+
+ // Start over with an empty instruction.
+ Inst = MCInst();
+ Inst.setOpcode(Opc);
+
+ if (!isMR)
+ Inst.addOperand(MCOperand::CreateReg(RegNo));
+
+ // Add the mem operand.
+ Inst.addOperand(MCOperand::CreateReg(0)); // Segment
+ Inst.addOperand(MCOperand::CreateImm(1)); // Scale
+ Inst.addOperand(MCOperand::CreateReg(0)); // IndexReg
+ Inst.addOperand(Disp); // Displacement
+ Inst.addOperand(MCOperand::CreateReg(0)); // BaseReg
+
+ if (isMR)
+ Inst.addOperand(MCOperand::CreateReg(RegNo));
+}
+
// FIXME: Custom X86 cleanup function to implement a temporary hack to handle
// matching INCL/DECL correctly for x86_64. This needs to be replaced by a
// proper mechanism for supporting (ambiguous) feature dependent instructions.
@@ -637,6 +662,14 @@
case X86::INC16m: Inst.setOpcode(X86::INC64_16m); break;
case X86::INC32r: Inst.setOpcode(X86::INC64_32r); break;
case X86::INC32m: Inst.setOpcode(X86::INC64_32m); break;
+
+ // moffset instructions are x86-32 only.
+ case X86::MOV8o8a: LowerMOffset(Inst, X86::MOV8rm , X86::AL , false); break;
+ case X86::MOV16o16a: LowerMOffset(Inst, X86::MOV16rm, X86::AX , false); break;
+ case X86::MOV32o32a: LowerMOffset(Inst, X86::MOV32rm, X86::EAX, false); break;
+ case X86::MOV8ao8: LowerMOffset(Inst, X86::MOV8mr , X86::AL , true); break;
+ case X86::MOV16ao16: LowerMOffset(Inst, X86::MOV16mr, X86::AX , true); break;
+ case X86::MOV32ao32: LowerMOffset(Inst, X86::MOV32mr, X86::EAX, true); break;
}
}
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index fc33ba9..db80c80 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -966,8 +966,8 @@
"mov{l}\t{$src, $dst|$dst, $src}",
[(store (i32 imm:$src), addr:$dst)]>;
-/// moffs8, moffs16, moffs32 and moffs64 versions of moves. The immediate is a
-/// 32-bit offset from the PC.
+/// moffs8, moffs16 and moffs32 versions of moves. The immediate is a
+/// 32-bit offset from the PC. These are only valid in x86-32 mode.
def MOV8o8a : Ii32 <0xA0, RawFrm, (outs), (ins offset8:$src),
"mov{b}\t{$src, %al|%al, $src}", []>;
def MOV16o16a : Ii32 <0xA1, RawFrm, (outs), (ins offset16:$src),
@@ -980,7 +980,7 @@
"mov{w}\t{%ax, $dst|$dst, %ax}", []>, OpSize;
def MOV32ao32 : Ii32 <0xA3, RawFrm, (outs offset32:$dst), (ins),
"mov{l}\t{%eax, $dst|$dst, %eax}", []>;
-
+
// Moves to and from segment registers
def MOV16rs : I<0x8C, MRMDestReg, (outs GR16:$dst), (ins SEGMENT_REG:$src),
"mov{w}\t{$src, $dst|$dst, $src}", []>;