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| author | Richard Kenner <kenner@gcc.gnu.org> | 1992-07-31 08:13:38 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1992-07-31 08:13:38 -0400 |
| commit | 58c8c59349b32c5f8ced092c74d2918580c218f0 (patch) | |
| tree | 3157856d1898a840aac68ef6de2bc701b24e3867 /gcc/combine.c | |
| parent | 510dd77e9569867570a74513c79eb767344370c6 (diff) | |
| download | gcc-58c8c59349b32c5f8ced092c74d2918580c218f0.zip gcc-58c8c59349b32c5f8ced092c74d2918580c218f0.tar.gz gcc-58c8c59349b32c5f8ced092c74d2918580c218f0.tar.bz2 | |
entered into RCS
From-SVN: r1731
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index ab9b09d..a2a11a1 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1886,14 +1886,32 @@ try_combine (i3, i2, i1) distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i3dest_killed, NULL_RTX), NULL_RTX, i3, newi2pat ? i2 : NULL_RTX, NULL_RTX, NULL_RTX); + + /* For I2 and I1, we have to be careful. If NEWI2PAT exists and sets + I2DEST or I1DEST, the death must be somewhere before I2, not I3. If + we passed I3 in that case, it might delete I2. */ + if (i2dest_in_i2src) - distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i2dest, NULL_RTX), - NULL_RTX, i3, newi2pat ? i2 : NULL_RTX, - NULL_RTX, NULL_RTX); + { + if (newi2pat && reg_set_p (i2dest, newi2pat)) + distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i2dest, NULL_RTX), + NULL_RTX, i2, NULL_RTX, NULL_RTX, NULL_RTX); + else + distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i2dest, NULL_RTX), + NULL_RTX, i3, newi2pat ? i2 : NULL_RTX, + NULL_RTX, NULL_RTX); + } + if (i1dest_in_i1src) - distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i1dest, NULL_RTX), - NULL_RTX, i3, newi2pat ? i2 : NULL_RTX, - NULL_RTX, NULL_RTX); + { + if (newi2pat && reg_set_p (i1dest, newi2pat)) + distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i1dest, NULL_RTX), + NULL_RTX, i2, NULL_RTX, NULL_RTX, NULL_RTX); + else + distribute_notes (gen_rtx (EXPR_LIST, REG_DEAD, i1dest, NULL_RTX), + NULL_RTX, i3, newi2pat ? i2 : NULL_RTX, + NULL_RTX, NULL_RTX); + } distribute_links (i3links); distribute_links (i2links); |