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| author | Jing Yu <jingyu@google.com> | 2010-01-15 21:54:01 +0000 |
|---|---|---|
| committer | Jing Yu <jingyu@gcc.gnu.org> | 2010-01-15 21:54:01 +0000 |
| commit | 4a62494df2d37fc03d1778fd69064dc6cd2dc0b9 (patch) | |
| tree | 58ebeac6f70fabacbde6abba8c1de445738f945e /gcc/combine.c | |
| parent | 5a869057b49f37060b718042d5131e4f8d2da802 (diff) | |
| download | gcc-4a62494df2d37fc03d1778fd69064dc6cd2dc0b9.zip gcc-4a62494df2d37fc03d1778fd69064dc6cd2dc0b9.tar.gz gcc-4a62494df2d37fc03d1778fd69064dc6cd2dc0b9.tar.bz2 | |
re PR rtl-optimization/42691 (problematic REG_EQUAL note added to SUBREG)
2010-01-15 Jing Yu <jingyu@google.com>
PR rtl-optimization/42691
* combine.c (try_combine): Set changed_i3_dest to 1 when I2 and I3 set
a pseudo to a constant and are merged, and adjust comments.
2010-01-15 Jing Yu <jingyu@google.com>
PR rtl-optimization/42691
* gcc.c-torture/execute/pr42691.c: New.
From-SVN: r155948
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 5ae557c..e5d4c5a 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2663,10 +2663,16 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p) i2dest = SET_DEST (temp); i2dest_killed = dead_or_set_p (i2, i2dest); + /* Replace the source in I2 with the new constant and make the + resulting insn the new pattern for I3. Then skip to where we + validate the pattern. Everything was set up above. */ SUBST (SET_SRC (temp), immed_double_const (olo, ohi, GET_MODE (SET_DEST (temp)))); newpat = PATTERN (i2); + + /* The dest of I3 has been replaced with the dest of I2. */ + changed_i3_dest = 1; goto validate_replacement; } } @@ -3038,8 +3044,6 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p) } } - /* We come here when we are replacing a destination in I2 with the - destination of I3. */ validate_replacement: /* Note which hard regs this insn has as inputs. */ |