diff options
| author | Chris Lattner <sabre@nondot.org> | 2004-10-04 07:08:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-10-04 07:08:46 +0000 |
| commit | 10f873b4206e487bb6f4435252b93633cf5eac5c (patch) | |
| tree | c3414ac94ad07c2470355aceec8863d7f821b3df | |
| parent | 37130d2b5edab108b05a29cd71b7476ff0bed172 (diff) | |
Apparently the GNU assembler has a HUGE hack to be compatible with really
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
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.td | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td index af7f4675bb..b250c044b5 100644 --- a/lib/Target/X86/X86InstrInfo.td +++ b/lib/Target/X86/X86InstrInfo.td @@ -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) |