bootstrapped / regtested on i686-pc-linux-gnu.
2013-11-08 Joern Rennecke <joern.renne...@embecosm.com>
PR middle-end/59049
* expmed.c (emit_cstore): Avoid generating a comparison of two
VOIDmode constants.
Index: gcc/expmed.c
===================================================================
--- gcc/expmed.c (revision 204568)
+++ gcc/expmed.c (working copy)
@@ -5112,6 +5112,12 @@ emit_cstore (rtx target, enum insn_code
if (!target)
target = gen_reg_rtx (target_mode);
+ /* If we compare two VOIDmode constants, we loose the mode to do the
+ comparison in. To avoid that, copy one constant into a register.
+ We rely on subsequent optimizations (like ce1) to clean this up. */
+ if (GET_MODE (x) == VOIDmode && GET_MODE (y) == VOIDmode)
+ x = copy_to_mode_reg (compare_mode, x);
+
comparison = gen_rtx_fmt_ee (code, result_mode, x, y);
create_output_operand (&ops[0], optimize ? NULL_RTX : target, result_mode);
