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2011-03-03 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
* ee.c (reg_use_p): Handle subregs of promoted vars.
=== modified file 'gcc/ee.c'
--- old/gcc/ee.c 2010-12-10 15:33:37 +0000
+++ new/gcc/ee.c 2011-03-03 17:08:58 +0000
@@ -209,7 +209,11 @@
*regno = REGNO (reg);
- if (paradoxical_subreg_p (use))
+ /* Non-paradoxical SUBREGs of promoted vars guarantee that the
+ upper (elided) bits of the inner register have a particular value.
+ For our purposes, such SUBREGs act as a full reference to the
+ inner register. */
+ if (paradoxical_subreg_p (use) || SUBREG_PROMOTED_VAR_P (use))
*size = GET_MODE_BITSIZE (GET_MODE (reg));
else
*size = subreg_lsb (use) + GET_MODE_BITSIZE (GET_MODE (use));
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