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(simplify_binary_operation... 

(simplify_binary_operation, case MULT): When testing for
floating-point equality, make sure we do so inside a region protected
from traps.

From-SVN: r3963
This commit is contained in:
Richard Kenner 1993-03-31 15:57:24 -05:00
parent 0b6b290048
commit 5a3d4befaf
1 changed files with 12 additions and 4 deletions
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16
gcc/cse.c
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@ -3565,15 +3565,23 @@ simplify_binary_operation (code, mode, op0, op1)
&& GET_MODE_CLASS (GET_MODE (op1)) == MODE_FLOAT)
{
REAL_VALUE_TYPE d;
jmp_buf handler;
int op1is2, op1ism1;
if (setjmp (handler))
return 0;
set_float_handler (handler);
REAL_VALUE_FROM_CONST_DOUBLE (d, op1);
op1is2 = REAL_VALUES_EQUAL (d, dconst2);
op1ism1 = REAL_VALUES_EQUAL (d, dconstm1);
set_float_handler (NULL_PTR);
/* x*2 is x+x and x*(-1) is -x */
if (REAL_VALUES_EQUAL (d, dconst2)
&& GET_MODE (op0) == mode)
if (op1is2 && GET_MODE (op0) == mode)
return gen_rtx (PLUS, mode, op0, copy_rtx (op0));
else if (REAL_VALUES_EQUAL (d, dconstm1)
&& GET_MODE (op0) == mode)
else if (op1ism1 && GET_MODE (op0) == mode)
return gen_rtx (NEG, mode, op0);
}
break;