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| author | Jim Wilson <wilson@cygnus.com> | 1997-08-19 16:04:22 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-08-19 10:04:22 -0600 |
| commit | a94ce33311d4bbc1f98d6f55beb133616347c682 (patch) | |
| tree | 25b3a60e6623c4cd6da8ad483c50546a449f0d52 /gcc/reload.c | |
| parent | e9576d2c229b3caea1c0c7fb0bd56eb1dd8537ee (diff) | |
| download | gcc-a94ce33311d4bbc1f98d6f55beb133616347c682.zip gcc-a94ce33311d4bbc1f98d6f55beb133616347c682.tar.gz gcc-a94ce33311d4bbc1f98d6f55beb133616347c682.tar.bz2 | |
reload.c (find_reloads): Add code to convert RELOAD_FOR_OPADDR_ADDR reloads to...
* reload.c (find_reloads): Add code to convert RELOAD_FOR_OPADDR_ADDR
reloads to RELOAD_FOR_OPERAND_ADDRESS reloads.
* reload1.c: Undo bugfix from Aug 11.
Back out "simple" patch for PA reload bug and install the one accepted
by the FSF.
From-SVN: r14847
Diffstat (limited to 'gcc/reload.c')
| -rw-r--r-- | gcc/reload.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/reload.c b/gcc/reload.c index a8bd5de..efd4aca 100644 --- a/gcc/reload.c +++ b/gcc/reload.c @@ -3871,6 +3871,35 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p) reload_opnum[i] = goal_alternative_matches[reload_opnum[i]]; } + /* Scan all the reloads, and check for RELOAD_FOR_OPERAND_ADDRESS reloads. + If we have more than one, then convert all RELOAD_FOR_OPADDR_ADDR + reloads to RELOAD_FOR_OPERAND_ADDRESS reloads. + + choose_reload_regs assumes that RELOAD_FOR_OPADDR_ADDR reloads never + conflict with RELOAD_FOR_OPERAND_ADDRESS reloads. This is true for a + single pair of RELOAD_FOR_OPADDR_ADDR/RELOAD_FOR_OPERAND_ADDRESS reloads. + However, if there is more than one RELOAD_FOR_OPERAND_ADDRESS reload, + then a RELOAD_FOR_OPADDR_ADDR reload conflicts with all + RELOAD_FOR_OPERAND_ADDRESS reloads other than the one that uses it. + This is complicated by the fact that a single operand can have more + than one RELOAD_FOR_OPERAND_ADDRESS reload. It is very difficult to fix + choose_reload_regs without affecting code quality, and cases that + actually fail are extremely rare, so it turns out to be better to fix + the problem here by not generating cases that choose_reload_regs will + fail for. */ + + { + int op_addr_reloads = 0; + for (i = 0; i < n_reloads; i++) + if (reload_when_needed[i] == RELOAD_FOR_OPERAND_ADDRESS) + op_addr_reloads++; + + if (op_addr_reloads > 1) + for (i = 0; i < n_reloads; i++) + if (reload_when_needed[i] == RELOAD_FOR_OPADDR_ADDR) + reload_when_needed[i] = RELOAD_FOR_OPERAND_ADDRESS; + } + /* See if we have any reloads that are now allowed to be merged because we've changed when the reload is needed to RELOAD_FOR_OPERAND_ADDRESS or RELOAD_FOR_OTHER_ADDRESS. Only |