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Don't return identity for CONST or symbolic reference 

gcc/

2012-08-09  H.J. Lu  <hongjiu.lu@intel.com>

	Backport from mainline
	2012-08-08  Richard Sandiford  <rdsandiford@googlemail.com>
		    H.J. Lu  <hongjiu.lu@intel.com>

	PR rtl-optimization/54157
	* combine.c (gen_lowpart_for_combine): Don't return identity
	for CONST or symbolic reference.

gcc/testsuite/

2012-08-09  H.J. Lu  <hongjiu.lu@intel.com>

	Backport from mainline
	2012-08-08  H.J. Lu  <hongjiu.lu@intel.com>

	PR rtl-optimization/54157
	* gcc.target/i386/pr54157.c: New file.

From-SVN: r190256
This commit is contained in:
H.J. Lu 2012-08-09 15:33:28 +00:00 committed by H.J. Lu
parent 0effd1a6a6
commit 75e5f9516f
4 changed files with 39 additions and 7 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2012-08-09 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline
2012-08-08 Richard Sandiford <rdsandiford@googlemail.com>
H.J. Lu <hongjiu.lu@intel.com>
PR rtl-optimization/54157
* combine.c (gen_lowpart_for_combine): Don't return identity
for CONST or symbolic reference.
2012-08-06 Uros Bizjak <ubizjak@gmail.com>
Backport from mainline

7
gcc/combine.c
View File

@ -10802,13 +10802,6 @@ gen_lowpart_for_combine (enum machine_mode omode, rtx x)
if (omode == imode)
return x;
/* Return identity if this is a CONST or symbolic reference. */
if (omode == Pmode
&& (GET_CODE (x) == CONST
|| GET_CODE (x) == SYMBOL_REF
|| GET_CODE (x) == LABEL_REF))
return x;
/* We can only support MODE being wider than a word if X is a
constant integer or has a mode the same size. */
if (GET_MODE_SIZE (omode) > UNITS_PER_WORD

8
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,11 @@
2012-08-09 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline
2012-08-08 H.J. Lu <hongjiu.lu@intel.com>
PR rtl-optimization/54157
* gcc.target/i386/pr54157.c: New file.
2012-08-01 Uros Bizjak <ubizjak@gmail.com>
Backport from mainline

21
gcc/testsuite/gcc.target/i386/pr54157.c Normal file
View File

@ -0,0 +1,21 @@
/* { dg-do compile { target { ! { ia32 } } } } */
/* { dg-options "-O2 -mx32 -ftree-vectorize" } */
struct s2{
int n[24 -1][24 -1][24 -1];
};
struct test2{
struct s2 e;
};
struct test2 tmp2[4];
void main1 ()
{
int i,j;
for (i = 0; i < 24 -4; i++)
for (j = 0; j < 24 -4; j++)
tmp2[2].e.n[1][i][j] = 8;
}