diff options
| author | krebbel <krebbel@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-11-22 19:52:34 +0000 |
|---|---|---|
| committer | krebbel <krebbel@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-11-22 19:52:34 +0000 |
| commit | 19f693555e6306279aab4fd0ce30db83ff9e2246 (patch) | |
| tree | ddf0e6a9a37ef629ed736da96036b927d492ddaa | |
| parent | ea0e88d1e2658f33c84769c883246c1e686827f8 (diff) | |
| download | gcc-19f693555e6306279aab4fd0ce30db83ff9e2246.tar.gz | |
2011-11-22 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
* postreload.c (reload_combine): Mark reg_state as invalid at
volatile insns if there has been a use already.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@181631 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/postreload.c | 18 |
2 files changed, 19 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ba48cc1f2cb..700e833677b 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2011-11-22 Andreas Krebbel <Andreas.Krebbel@de.ibm.com> + + * postreload.c (reload_combine): Mark reg_state as invalid at + volatile insns if there has been a use already. + 2011-11-21 Aldy Hernandez <aldyh@redhat.com> * opts.c (finish_options): Do not fail for -fgnu-tm. diff --git a/gcc/postreload.c b/gcc/postreload.c index 886d024926c..5c189129445 100644 --- a/gcc/postreload.c +++ b/gcc/postreload.c @@ -1312,11 +1312,21 @@ reload_combine (void) is and then later disable any optimization that would cross it. */ if (LABEL_P (insn)) last_label_ruid = reload_combine_ruid; - else if (BARRIER_P (insn) - || (INSN_P (insn) && volatile_insn_p (PATTERN (insn)))) - for (r = 0; r < FIRST_PSEUDO_REGISTER; r++) - if (! fixed_regs[r]) + else if (BARRIER_P (insn)) + { + /* Crossing a barrier resets all the use information. */ + for (r = 0; r < FIRST_PSEUDO_REGISTER; r++) + if (! fixed_regs[r]) reg_state[r].use_index = RELOAD_COMBINE_MAX_USES; + } + else if (INSN_P (insn) && volatile_insn_p (PATTERN (insn))) + /* Optimizations across insns being marked as volatile must be + prevented. All the usage information is invalidated + here. */ + for (r = 0; r < FIRST_PSEUDO_REGISTER; r++) + if (! fixed_regs[r] + && reg_state[r].use_index != RELOAD_COMBINE_MAX_USES) + reg_state[r].use_index = -1; if (! NONDEBUG_INSN_P (insn)) continue; |