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(subst, case MINUS): Allow some FP simplifications if -ffast-math.

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(reversible_comparison_p): FP comparisons reversible with -ffast-math.

From-SVN: r6333
This commit is contained in:
Richard Kenner 1993-12-27 08:47:14 -05:00
parent 60614fddd4
commit 7e2a0d8ef4
1 changed files with 5 additions and 2 deletions
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7
gcc/combine.c
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@ -3335,7 +3335,8 @@ subst (x, from, to, in_dest, unique_copy)
if (GET_CODE (XEXP (x, 0)) == MINUS
&& (! FLOAT_MODE_P (mode)
/* x-y != -(y-x) with IEEE floating point. */
|| TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT))
|| TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
|| flag_fast_math))
{
x = gen_binary (MINUS, mode, XEXP (XEXP (x, 0), 1),
XEXP (XEXP (x, 0), 0));
@ -3428,7 +3429,8 @@ subst (x, from, to, in_dest, unique_copy)
/* In IEEE floating point, x-0 is not the same as x. */
if ((TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
|| ! FLOAT_MODE_P (GET_MODE (XEXP (x, 0))))
|| ! FLOAT_MODE_P (GET_MODE (XEXP (x, 0)))
|| flag_fast_math)
&& XEXP (x, 1) == CONST0_RTX (GET_MODE (XEXP (x, 0))))
return XEXP (x, 0);
break;
@ -9198,6 +9200,7 @@ reversible_comparison_p (x)
rtx x;
{
if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
|| flag_fast_math
|| GET_CODE (x) == NE || GET_CODE (x) == EQ)
return 1;