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| author | Richard Stallman <rms@gnu.org> | 1992-03-22 03:36:46 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1992-03-22 03:36:46 +0000 |
| commit | 333e0f7d36aa66fb00cf587d04a6738ee6c9f73a (patch) | |
| tree | 5afa8a4ff7b83ce9fc4b920f91acf86fa420ddcf /gcc/local-alloc.c | |
| parent | 391b99c9202dfc9b327ecf636a840e2229caf8ee (diff) | |
| download | gcc-333e0f7d36aa66fb00cf587d04a6738ee6c9f73a.zip gcc-333e0f7d36aa66fb00cf587d04a6738ee6c9f73a.tar.gz gcc-333e0f7d36aa66fb00cf587d04a6738ee6c9f73a.tar.bz2 | |
*** empty log message ***
From-SVN: r562
Diffstat (limited to 'gcc/local-alloc.c')
| -rw-r--r-- | gcc/local-alloc.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index 90cac29..fc45217 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -1729,7 +1729,8 @@ reg_is_born (reg, birth) /* Record the death of REG in the current insn. If OUTPUT_P is non-zero, REG is an output that is dying (i.e., it is never used), otherwise it - is an input (the normal case). */ + is an input (the normal case). + If OUTPUT_P is 1, then we extend the life past the end of this insn. */ static void wipe_dead_reg (reg, output_p) @@ -1738,6 +1739,25 @@ wipe_dead_reg (reg, output_p) { register int regno = REGNO (reg); + /* If this insn has multiple results, + and the dead reg is used in one of the results, + extend its life to after this insn, + so it won't get allocated together with any other result of this insn. */ + if (GET_CODE (PATTERN (this_insn)) == PARALLEL + && !single_set (this_insn)) + { + int i; + for (i = XVECLEN (PATTERN (this_insn), 0) - 1; i >= 0; i--) + { + rtx set = XVECEXP (PATTERN (this_insn), 0, i); + if (GET_CODE (set) == SET + && GET_CODE (SET_DEST (set)) != REG + && !rtx_equal_p (reg, SET_DEST (set)) + && reg_overlap_mentioned_p (reg, SET_DEST (set))) + output_p = 1; + } + } + if (regno < FIRST_PSEUDO_REGISTER) { mark_life (regno, GET_MODE (reg), 0); |