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Convert V1TImode register to TImode in debug insn

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TImode register referenced in debug insn can be converted to V1TImode by
scalar to vector optimization.  When converting a TImode store to V1TImode,
we need to check all debug insns on its use chain to convert the V1TImode
register to SUBREG TImode if source register is undefined.

gcc/

	PR target/72748
	* config/i386/i386.c (timode_scalar_chain::convert_insn): Call
	fix_debug_reg_uses after changing source register mode to
	V1TImode if source register is undefined.

gcc/testsuite/

	PR target/72748
	* gcc.target/i386/pr72748.c: New test.

From-SVN: r238956
This commit is contained in:
H.J. Lu 2016-08-01 14:46:01 +00:00 • committed by H.J. Lu
parent 2a93954eab
commit 37bce35a7e
4 changed files with 45 additions and 0 deletions
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7
gcc/ChangeLog
View file

@ -1,3 +1,10 @@
2015-08-01 H.J. Lu <hongjiu.lu@intel.com>
PR target/72748
* config/i386/i386.c (timode_scalar_chain::convert_insn): Call
fix_debug_reg_uses after changing source register mode to
V1TImode if source register is undefined.
2015-08-01 Alan Hayward <alan.hayward@arm.com>
PR tree-optimization/71818

6
gcc/config/i386/i386.c
View file

@ -3858,6 +3858,12 @@ timode_scalar_chain::convert_insn (rtx_insn *insn)
switch (GET_CODE (src))
{
case REG:
PUT_MODE (src, V1TImode);
/* Call fix_debug_reg_uses only if SRC is never defined. */
if (!DF_REG_DEF_CHAIN (REGNO (src)))
fix_debug_reg_uses (src);
break;
case MEM:
PUT_MODE (src, V1TImode);
break;

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2015-08-01 H.J. Lu <hongjiu.lu@intel.com>
PR target/72748
* gcc.target/i386/pr72748.c: New test.
2015-08-01 Alan Hayward <alan.hayward@arm.com>
PR tree-optimization/71818

27
gcc/testsuite/gcc.target/i386/pr72748.c Normal file
View file

@ -0,0 +1,27 @@
/* { dg-do compile } */
/* { dg-options "-O2 -g" } */
volatile int a;
int c, d, e, f, g, h;
int fn1 ()
{
int i;
for (; d;)
{
if (e)
break;
g = 0;
int j[4];
for (h = 0; h < 4; h++)
g++;
for (; c < 2; c++)
{
e = j[g];
i = j[0];
f = 4;
}
f |= d;
}
return a;
}