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(output_float_compare): Added support for Pentium Pro 

fcomi instruction which sets EFLAGS instead of FPU Status Word.

From-SVN: r12563
This commit is contained in:
Stan Cox 1996-07-25 18:07:48 +00:00
parent 9ad91d7115
commit 5703bb6603
1 changed files with 10 additions and 2 deletions
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12
gcc/config/i386/i386.c
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@ -3548,6 +3548,7 @@ output_float_compare (insn, operands)
int stack_top_dies;
rtx body = XVECEXP (PATTERN (insn), 0, 0);
int unordered_compare = GET_MODE (SET_SRC (body)) == CCFPEQmode;
int target_fcomi = TARGET_CMOVE && STACK_REG_P (operands[1]);
rtx tmp;
if (! STACK_TOP_P (operands[0]))
@ -3585,9 +3586,9 @@ output_float_compare (insn, operands)
unordered float compare. */
if (unordered_compare)
strcpy (buf, "fucom");
strcpy (buf, target_fcomi ? "fucomi" : "fucom");
else if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_FLOAT)
strcpy (buf, "fcom");
strcpy (buf, target_fcomi ? "fcomi" : "fcom");
else
strcpy (buf, "ficom");
@ -3598,6 +3599,13 @@ output_float_compare (insn, operands)
if (NON_STACK_REG_P (operands[1]))
output_op_from_reg (operands[1], strcat (buf, AS1 (%z0,%1)));
else if (target_fcomi)
{
rtx xops[] = {operands[0], operands[1], operands[0]};
output_asm_insn (strcat (buf, AS2 (%z1,%y1,%2)), xops);
RET;
}
else
output_asm_insn (strcat (buf, AS1 (%z1,%y1)), operands);
}