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fix rdar://8456371 - Handle commutable instructions written backward.

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llvm-svn: 114536
This commit is contained in:
Chris Lattner 2010-09-22 06:26:39 +00:00
parent 1864d6728d
commit f90b2a5a26
2 changed files with 18 additions and 0 deletions
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10
lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -911,6 +911,16 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
Operands.erase(Operands.begin() + 2);
}
// FIXME: Hack to handle "f{mul*,add*} st(0), $op" the same as
// "f{mul*,add*} $op", since they commute.
if ((Name.startswith("fmul") || Name.startswith("fadd")) &&
Operands.size() == 3 &&
static_cast<X86Operand*>(Operands[1])->isReg() &&
static_cast<X86Operand*>(Operands[1])->getReg() == X86::ST0) {
delete Operands[1];
Operands.erase(Operands.begin() + 1);
}
// FIXME: Hack to handle "imul <imm>, B" which is an alias for "imul <imm>, B,
// B".
if (Name.startswith("imul") && Operands.size() == 3 &&

8
test/MC/AsmParser/X86/x86_instructions.s
View File

@ -353,3 +353,11 @@ mov %rdx, %cr8
mov %rdx, %cr15
// CHECK: movq %rdx, %cr15
// CHECK: encoding: [0x44,0x0f,0x22,0xfa]
// rdar://8456371 - Handle commutable instructions written backward.
// CHECK: faddp %st(1)
// CHECK: fmulp %st(2)
faddp %st, %st(1)
fmulp %st, %st(2)