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https://bugs.launchpad.net/gcc-linaro/+bug/728315
https://lists.openwrt.org/pipermail/openwrt-devel/2011-March/009847.html
--- a/gcc/ee.c
+++ b/gcc/ee.c
@@ -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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