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combine.c (subst): Use simplify_subreg_regno rather than REG_CANNOT_CHANGE_MODE_P to detect... 

gcc/
	* combine.c (subst): Use simplify_subreg_regno rather than
	REG_CANNOT_CHANGE_MODE_P to detect invalid mode changes.

From-SVN: r215448
This commit is contained in:
Richard Sandiford 2014-09-22 07:36:59 +00:00 committed by Richard Sandiford
parent 0cb07998ae
commit 7af3b946a4
2 changed files with 8 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-09-22 Richard Sandiford <richard.sandiford@arm.com>
* combine.c (subst): Use simplify_subreg_regno rather than
REG_CANNOT_CHANGE_MODE_P to detect invalid mode changes.
2014-09-22 Richard Sandiford <richard.sandiford@arm.com>
* rtl.h (subreg_info): Expand commentary

8
gcc/combine.c
View File

@ -5121,15 +5121,13 @@ subst (rtx x, rtx from, rtx to, int in_dest, int in_cond, int unique_copy)
)
return gen_rtx_CLOBBER (VOIDmode, const0_rtx);
#ifdef CANNOT_CHANGE_MODE_CLASS
if (code == SUBREG
&& REG_P (to)
&& REGNO (to) < FIRST_PSEUDO_REGISTER
&& REG_CANNOT_CHANGE_MODE_P (REGNO (to),
GET_MODE (to),
GET_MODE (x)))
&& simplify_subreg_regno (REGNO (to), GET_MODE (to),
SUBREG_BYTE (x),
GET_MODE (x)) < 0)
return gen_rtx_CLOBBER (VOIDmode, const0_rtx);
#endif
new_rtx = (unique_copy && n_occurrences ? copy_rtx (to) : to);
n_occurrences++;