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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
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@ -921,8 +921,10 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
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}
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// FIXME: Hack to handle "f{mulp,addp} st(0), $op" the same as
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// "f{mulp,addp} $op", since they commute.
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if ((Name == "fmulp" || Name == "faddp") && Operands.size() == 3 &&
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// "f{mulp,addp} $op", since they commute. We also allow fdivrp/fsubrp even
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// though they don't commute, solely because gas does support this.
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if ((Name=="fmulp" || Name=="faddp" || Name=="fsubrp" || Name=="fdivrp") &&
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Operands.size() == 3 &&
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static_cast<X86Operand*>(Operands[1])->isReg() &&
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static_cast<X86Operand*>(Operands[1])->getReg() == X86::ST0) {
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delete Operands[1];
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@ -466,3 +466,11 @@ movmskpd %xmm6, %rax
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movmskpd %xmm6, %eax
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// CHECK: movmskpd %xmm6, %eax
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// CHECK: encoding: [0x66,0x0f,0x50,0xc6]
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// rdar://8491845 - Gas supports commuted forms of non-commutable instructions.
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fdivrp %st(0), %st(1) // CHECK: encoding: [0xde,0xf9]
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fdivrp %st(1), %st(0) // CHECK: encoding: [0xde,0xf9]
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fsubrp %ST(0), %ST(1) // CHECK: encoding: [0xde,0xe9]
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fsubrp %ST(1), %ST(0) // CHECK: encoding: [0xde,0xe9]
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