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| author | Richard Kenner <kenner@gcc.gnu.org> | 1995-10-19 18:44:41 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1995-10-19 18:44:41 -0400 |
| commit | 932d1119f5bed0210b5f67355e60959f253dd46b (patch) | |
| tree | 872c26833b33b0e37d4c2aa5d4e512c448aaee18 | |
| parent | 5918c8534aead231920714bacbef7fd458bc353c (diff) | |
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(distribute_notes): When search for new place to put REG_DEAD note,
call distribute_links if this new place is between i2 and i3, and i2
uses the register.
From-SVN: r10475
| -rw-r--r-- | gcc/combine.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 8e46de0..cd7dc12 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -10779,6 +10779,21 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1) && find_reg_fusage (tem, USE, XEXP (note, 0)))) { place = tem; + + /* If we are doing a 3->2 combination, and we have a + register which formerly died in i3 and was not used + by i2, which now no longer dies in i3 and is used in + i2 but does not die in i2, and place is between i2 + and i3, then we may need to move a link from place to + i2. */ + if (i2 && INSN_CUID (place) > INSN_CUID (i2) + && from_insn && INSN_CUID (from_insn) > INSN_CUID (i2) + && reg_referenced_p (XEXP (note, 0), PATTERN (i2))) + { + rtx links = LOG_LINKS (place); + LOG_LINKS (place) = 0; + distribute_links (links); + } break; } } |