implement rdar://8491845 - Gas supports commuted forms of non-commutable instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115061 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index c8b25ce..3ecf273 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -921,8 +921,10 @@
}
// FIXME: Hack to handle "f{mulp,addp} st(0), $op" the same as
- // "f{mulp,addp} $op", since they commute.
- if ((Name == "fmulp" || Name == "faddp") && Operands.size() == 3 &&
+ // "f{mulp,addp} $op", since they commute. We also allow fdivrp/fsubrp even
+ // though they don't commute, solely because gas does support this.
+ if ((Name=="fmulp" || Name=="faddp" || Name=="fsubrp" || Name=="fdivrp") &&
+ Operands.size() == 3 &&
static_cast<X86Operand*>(Operands[1])->isReg() &&
static_cast<X86Operand*>(Operands[1])->getReg() == X86::ST0) {
delete Operands[1];