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Apparently the GNU assembler has a HUGE hack to be compatible with really

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old and broken AT&T syntax assemblers.  The problem with this hack is that
*SOME* forms of the fdiv and fsub instructions have the 'r' bit inverted.
This was a real pain to figure out, but is trivially easy to support: thus
we are now bug compatible with gas and gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16644 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-04 07:08:46 +00:00
parent 37130d2b5e
commit 10f873b420
1 changed files with 12 additions and 9 deletions
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21
lib/Target/X86/X86InstrInfo.td
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@ -369,7 +369,7 @@ def IDIV32m: I<0xF7, MRM7m, (ops i32mem:$src), // EDX:EAX/[mem32] = EAX,EDX
def CBW : I<0x98, RawFrm, (ops),
"{cbtw|cbw}">, Imp<[AL],[AH]>; // AX = signext(AL)
def CWD : I<0x99, RawFrm, (ops),
"{cwtl|cwd}">, Imp<[AX],[DX]>; // DX:AX = signext(AX)
"{cwtd|cwd}">, Imp<[AX],[DX]>; // DX:AX = signext(AX)
def CDQ : I<0x99, RawFrm, (ops),
"{cltd|cdq}">, Imp<[EAX],[EDX]>; // EDX:EAX = signext(EAX)
@ -1372,19 +1372,22 @@ def FADDrST0 : FPrST0Inst <0xC0, (ops RST:$op),
def FADDPrST0 : FPrST0PInst<0xC0, (ops RST:$op),
"faddp $op">;
// NOTE: GAS and apparently all other AT&T style assemblers have a broken notion
// of some of the 'reverse' forms of the fsub and fdiv instructions. As such,
// we have to put some 'r's in and take them out of wierd places.
def FSUBRST0r : FPST0rInst <0xE8, (ops RST:$op),
"fsubr $op">;
def FSUBrST0 : FPrST0Inst <0xE8, (ops RST:$op),
"fsub {%ST(0), $op|$op, %ST(0)}">;
"fsub{r} {%ST(0), $op|$op, %ST(0)}">;
def FSUBPrST0 : FPrST0PInst<0xE8, (ops RST:$op),
"fsubp $op">;
"fsub{r}p $op">;
def FSUBST0r : FPST0rInst <0xE0, (ops RST:$op),
"fsub $op">;
def FSUBRrST0 : FPrST0Inst <0xE0, (ops RST:$op),
"fsubr {%ST(0), $op|$op, %ST(0)}">;
"fsub{|r} {%ST(0), $op|$op, %ST(0)}">;
def FSUBRPrST0 : FPrST0PInst<0xE0, (ops RST:$op),
"fsubrp $op">;
"fsub{|r}p $op">;
def FMULST0r : FPST0rInst <0xC8, (ops RST:$op),
"fmul $op">;
@ -1396,16 +1399,16 @@ def FMULPrST0 : FPrST0PInst<0xC8, (ops RST:$op),
def FDIVRST0r : FPST0rInst <0xF8, (ops RST:$op),
"fdivr $op">;
def FDIVrST0 : FPrST0Inst <0xF8, (ops RST:$op),
"fdiv {%ST(0), $op|$op, %ST(0)}">;
"fdiv{r} {%ST(0), $op|$op, %ST(0)}">;
def FDIVPrST0 : FPrST0PInst<0xF8, (ops RST:$op),
"fdivp $op">;
"fdiv{r}p $op">;
def FDIVST0r : FPST0rInst <0xF0, (ops RST:$op), // ST(0) = ST(0) / ST(i)
"fdiv $op">;
def FDIVRrST0 : FPrST0Inst <0xF0, (ops RST:$op), // ST(i) = ST(0) / ST(i)
"fdivr {%ST(0), $op|$op, %ST(0)}">;
"fdiv{|r} {%ST(0), $op|$op, %ST(0)}">;
def FDIVRPrST0 : FPrST0PInst<0xF0, (ops RST:$op), // ST(i) = ST(0) / ST(i), pop
"fdivrp $op">;
"fdiv{|r}p $op">;
// Floating point compares
def FUCOMr : FPI<0xE0, AddRegFrm, CompareFP, // FPSW = cmp ST(0) with ST(i)