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(tstdi): Use tst/subx #0 instead of neg/negx. 

Allow "a" and ">" for operand 0.

From-SVN: r9841
This commit is contained in:
Richard Kenner 1995-05-30 08:17:18 -04:00
parent 28ee27fd55
commit b41059b4e3
1 changed files with 18 additions and 5 deletions
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23
gcc/config/m68k/m68k.md
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@ -283,16 +283,29 @@
(define_insn "tstdi"
[(set (cc0)
(match_operand:DI 0 "nonimmediate_operand" "do"))]
(match_operand:DI 0 "nonimmediate_operand" "oa>,d"))
(clobber (match_scratch:SI 1 "=d,d"))
(clobber (match_scratch:SI 2 "=d,"))]
""
"*
{
if (GET_CODE (operands[0]) == REG)
operands[1] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
operands[3] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
else if (GET_CODE (operands[0]) == MEM
&& GET_CODE (XEXP (operands[0], 0)) == POST_INC)
operands[3] = operands[0];
else
operands[1] = adj_offsettable_operand (operands[0], 4);
/* Just in case we come here. I hope all tst:DI are combined !!! */
return \"neg%.l %1\;negx%.l %0\;neg%.l %1\;negx%.l %0\";
operands[3] = adj_offsettable_operand (operands[0], 4);
if (DATA_REG_P (operands[0]))
operands[2] = operands[0];
else
output_asm_insn (\"move%.l %0,%2\", operands);
/*
** 'sub' clears %1, and also clears the X cc bit
** 'tst' sets the Z cc bit according to the low part of the DImode operand
** 'subx %1' (i.e. subx #0) acts as a (non-existent) tstx on the high part
*/
return \"sub%.l %1,%1\;tst%.l %3\;subx%.l %1,%2\";
}")
(define_insn "tstsi"