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| author | J"orn Rennecke <amylaar@cygnus.co.uk> | 1998-05-21 11:52:31 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 1998-05-21 12:52:31 +0100 |
| commit | cecbf6e2b3fcef0f3bd4131d78775e65e5bdaf4a (patch) | |
| tree | c803c0ffc785816b084c3742aee12692acaf1724 /gcc/reload1.c | |
| parent | b52ce03da5fcaf93480c6f0d95e9be500a97fb33 (diff) | |
| download | gcc-cecbf6e2b3fcef0f3bd4131d78775e65e5bdaf4a.zip gcc-cecbf6e2b3fcef0f3bd4131d78775e65e5bdaf4a.tar.gz gcc-cecbf6e2b3fcef0f3bd4131d78775e65e5bdaf4a.tar.bz2 | |
reload1.c (reload_reg_free_for_value_p): Fix RELOAD_FOR_INPUT end of lifetime and RELOAD_FOR_OUTPUT start of lifetime.
* reload1.c (reload_reg_free_for_value_p): Fix RELOAD_FOR_INPUT
end of lifetime and RELOAD_FOR_OUTPUT start of lifetime.
From-SVN: r19929
Diffstat (limited to 'gcc/reload1.c')
| -rw-r--r-- | gcc/reload1.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index e3bc950..e0602be 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -5003,7 +5003,14 @@ reload_reg_free_for_value_p (regno, opnum, type, value) monotonic. Some reload types use different 'buckets' for each operand. So there are MAX_RECOG_OPERANDS different time values for each - such reload type. */ + such reload type. + We compute TIME1 as the time when the register for the prospective + new reload ceases to be live, and TIME2 for each existing + reload as the time when that the reload register of that reload + becomes live. + Where there is little to be gained by exact lifetime calculations, + we just make conservative assumptions, i.e. a longer lifetime; + this is done in the 'default:' cases. */ switch (type) { case RELOAD_FOR_OTHER_ADDRESS: @@ -5022,10 +5029,12 @@ reload_reg_free_for_value_p (regno, opnum, type, value) time1 = opnum * 4 + 2; break; case RELOAD_FOR_INPUT: - time1 = opnum * 4 + 3; + /* All RELOAD_FOR_INPUT reloads remain live till just before the + instruction is executed. */ + time1 = (MAX_RECOG_OPERANDS - 1) * 4 + 3; break; /* opnum * 4 + 3 < opnum * 4 + 4 - <= (MAX_RECOG_OPERAND - 1) * 4 + 4 == MAX_RECOG_OPERAND * 4 */ + <= (MAX_RECOG_OPERANDS - 1) * 4 + 4 == MAX_RECOG_OPERANDS * 4 */ case RELOAD_FOR_OUTPUT_ADDRESS: time1 = MAX_RECOG_OPERANDS * 4 + opnum; break; @@ -5057,10 +5066,13 @@ reload_reg_free_for_value_p (regno, opnum, type, value) case RELOAD_FOR_INPUT: time2 = reload_opnum[i] * 4 + 3; break; - /* RELOAD_FOR_OUTPUT and RELOAD_FOR_OUTPUT_ADDRESS reloads - for identical operand number conflict with each other, so - assign them the same time value. */ case RELOAD_FOR_OUTPUT: + /* All RELOAD_FOR_OUTPUT reloads become live just after the + instruction is executed. */ + time2 = MAX_RECOG_OPERANDS * 4; + break; + /* The first RELOAD_FOR_OUTPUT_ADDRESS reload conflicts with the + RELOAD_FOR_OUTPUT reloads, so assign it the same time value. */ case RELOAD_FOR_OUTPUT_ADDRESS: time2 = MAX_RECOG_OPERANDS * 4 + reload_opnum[i]; break; |