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This series of patches are for fixing PR61441. 

This series of patches are for fixing PR61441. This patch modifies code to use
REAL_VALUE_ISSIGNALING_NAN instead of REAL_VALUE_ISNAN to avoid the operatins
only for sNaN operands.

Bootstrapped & regression-tested on x86_64-linux-gnu.

gcc/
	* fold-const.c (const_binop): Use REAL_VALUE_ISSIGNALING_NAN instead
	of REAL_VALUE_ISNAN to avoid the operation for sNaN operands.
	* simplify-rtx.c (simplify_const_binary_operation): Same.

From-SVN: r231857
This commit is contained in:
Sujoy Saraswati 2015-12-20 09:13:51 +00:00 committed by Sujoy Saraswati
parent e4dbb0d449
commit 683aa9290b
3 changed files with 12 additions and 3 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2015-12-20 Sujoy Saraswati <sujoy.saraswati@hpe.com>
PR tree-optimization/61441
* fold-const.c (const_binop): Use REAL_VALUE_ISSIGNALING_NAN instead
of REAL_VALUE_ISNAN to avoid the operation for sNaN operands.
* simplify-rtx.c (simplify_const_binary_operation): Same.
2015-12-19 Jan Hubicka <hubicka@ucw.cz>
PR middle-end/65337

5
gcc/fold-const.c
View File

@ -1150,9 +1150,10 @@ const_binop (enum tree_code code, tree arg1, tree arg2)
mode = TYPE_MODE (type);
/* Don't perform operation if we honor signaling NaNs and
either operand is a NaN. */
either operand is a signaling NaN. */
if (HONOR_SNANS (mode)
&& (REAL_VALUE_ISNAN (d1) || REAL_VALUE_ISNAN (d2)))
&& (REAL_VALUE_ISSIGNALING_NAN (d1)
|| REAL_VALUE_ISSIGNALING_NAN (d2)))
return NULL_TREE;
/* Don't perform operation if it would raise a division

3
gcc/simplify-rtx.c
View File

@ -3892,7 +3892,8 @@ simplify_const_binary_operation (enum rtx_code code, machine_mode mode,
real_convert (&f1, mode, CONST_DOUBLE_REAL_VALUE (op1));
if (HONOR_SNANS (mode)
&& (REAL_VALUE_ISNAN (f0) || REAL_VALUE_ISNAN (f1)))
&& (REAL_VALUE_ISSIGNALING_NAN (f0)
|| REAL_VALUE_ISSIGNALING_NAN (f1)))
return 0;
if (code == DIV