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toolchain/gcc (linaro): fix extension elimination optimization

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This applies Richard Sandiford's patch for Linaro GCC as an alternative to disabling the Linaro-specific extension elimination optimization altogether.

Original patch: https://bugs.launchpad.net/gcc-linaro/+bug/728315
Signed-off-by: Mark Mentovai <mark@moxienet.com>

SVN-Revision: 25871
This commit is contained in:
Felix Fietkau 2011-03-04 21:38:15 +00:00
parent 200460fb54
commit fff328fd41
2 changed files with 18 additions and 11 deletions
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11
toolchain/gcc/patches/linaro/860-disable_extension_elimination.patch
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@ -1,11 +0,0 @@
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -906,7 +906,7 @@ decode_options (unsigned int argc, const
flag_tree_if_to_switch_conversion = opt2;
flag_ipa_cp = opt2;
flag_ipa_sra = opt2;
- flag_ee = opt2;
+ flag_ee = 0;
/* Track fields in field-sensitive alias analysis. */
set_param_value ("max-fields-for-field-sensitive",

18
toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch Normal file
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@ -0,0 +1,18 @@
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));