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re PR c/39902 (x * 1.0DF gets wrong value)

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PR c/39902
	* simplify-rtx.c (simplify_binary_operation_1): Disable
	simplifications for decimal float operations.

	PR c/39902
	* gcc.target/powerpc/pr39902-2.c: New test.

From-SVN: r150383
This commit is contained in:
Janis Johnson 2009-08-03 21:38:53 +00:00 • committed by Janis Johnson
parent 1768a05203
commit 50cd60be11
4 changed files with 40 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2009-08-03 Janis Johnson <janis187@us.ibm.com>
PR c/39902
* simplify-rtx.c (simplify_binary_operation_1): Disable
simplifications for decimal float operations.
2009-08-03 Jakub Jelinek <jakub@redhat.com>
PR middle-end/40943

1
gcc/simplify-rtx.c
View file

@ -1997,6 +1997,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
/* x*2 is x+x and x*(-1) is -x */
if (GET_CODE (trueop1) == CONST_DOUBLE
&& SCALAR_FLOAT_MODE_P (GET_MODE (trueop1))
&& !DECIMAL_FLOAT_MODE_P (GET_MODE (trueop1))
&& GET_MODE (op0) == mode)
{
REAL_VALUE_TYPE d;

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2009-08-03 Janis Johnson <janis187@us.ibm.com>
PR c/39902
* gcc.target/powerpc/pr39902-2.c: New test.
2009-08-03 Jakub Jelinek <jakub@redhat.com>
PR middle-end/40943

28
gcc/testsuite/gcc.target/powerpc/pr39902-2.c Normal file
View file

@ -0,0 +1,28 @@
/* Check that simplification "x*(-1)" -> "-x" is not performed for decimal
float types. */
/* { dg-do compile { target { powerpc*-*-linux* && powerpc_fprs } } } */
/* { dg-options "-std=gnu99 -O -mcpu=power6" } */
/* { dg-final { scan-assembler-not "fneg" } } */
extern _Decimal32 a32, b32;
extern _Decimal64 a64, b64;
extern _Decimal128 a128, b128;
void
foo32 (void)
{
b32 = a32 * -1.0DF;
}
void
foo64 (void)
{
b64 = a64 * -1.0DD;
}
void
foo128 (void)
{
b128 = a128 * -1.0DL;
}