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19 lines
678 B
Diff
19 lines
678 B
Diff
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https://bugs.launchpad.net/gcc-linaro/+bug/728315
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https://lists.openwrt.org/pipermail/openwrt-devel/2011-March/009847.html
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--- a/gcc/ee.c
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+++ b/gcc/ee.c
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@@ -209,7 +209,11 @@
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*regno = REGNO (reg);
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- if (paradoxical_subreg_p (use))
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+ /* Non-paradoxical SUBREGs of promoted vars guarantee that the
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+ upper (elided) bits of the inner register have a particular value.
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+ For our purposes, such SUBREGs act as a full reference to the
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+ inner register. */
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+ if (paradoxical_subreg_p (use) || SUBREG_PROMOTED_VAR_P (use))
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*size = GET_MODE_BITSIZE (GET_MODE (reg));
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else
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*size = subreg_lsb (use) + GET_MODE_BITSIZE (GET_MODE (use));
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