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| author | Hans-Peter Nilsson <hp@axis.com> | 2008-02-01 21:28:46 +0000 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@gcc.gnu.org> | 2008-02-01 21:28:46 +0000 |
| commit | 3e836a310dd93958129e5b917466c4f11cbabc13 (patch) | |
| tree | 249cc303d527362a0580a568986dea3066f5601b /gcc/fwprop.c | |
| parent | 2449e8e5cdb140871c4368606cd3405a48103319 (diff) | |
| download | gcc-3e836a310dd93958129e5b917466c4f11cbabc13.zip gcc-3e836a310dd93958129e5b917466c4f11cbabc13.tar.gz gcc-3e836a310dd93958129e5b917466c4f11cbabc13.tar.bz2 | |
re PR rtl-optimization/34773 (miscompilation of vfprintf_r)
PR rtl-optimization/34773
* reg-notes.def (EQUAL): Mention significance of combination of
REG_EQUAL and REG_RETVAL.
* fwprop.c (try_fwprop_subst): Don't add REG_EQUAL to an
insn that has a REG_RETVAL.
From-SVN: r132053
Diffstat (limited to 'gcc/fwprop.c')
| -rw-r--r-- | gcc/fwprop.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/fwprop.c b/gcc/fwprop.c index 6bc9c67..1e03272 100644 --- a/gcc/fwprop.c +++ b/gcc/fwprop.c @@ -729,9 +729,12 @@ try_fwprop_subst (struct df_ref *use, rtx *loc, rtx new, rtx def_insn, bool set_ { cancel_changes (0); - /* Can also record a simplified value in a REG_EQUAL note, making a - new one if one does not already exist. */ - if (set_reg_equal) + /* Can also record a simplified value in a REG_EQUAL note, + making a new one if one does not already exist. + Don't do this if the insn has a REG_RETVAL note, because the + combined presence means that the REG_EQUAL note refers to the + (full) contents of the libcall value. */ + if (set_reg_equal && !find_reg_note (insn, REG_RETVAL, NULL_RTX)) { if (dump_file) fprintf (dump_file, " Setting REG_EQUAL note\n"); |