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| author | Jim Wilson <wilson@gcc.gnu.org> | 1994-07-18 19:02:32 -0700 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1994-07-18 19:02:32 -0700 |
| commit | 7a17c5881cd885f908f97bab9b8032f554073071 (patch) | |
| tree | 23aa2a934548804b727312cac3643340d890b494 /gcc | |
| parent | 8c4f5c09f073aa9cf6991212446510634c4fba16 (diff) | |
| download | gcc-7a17c5881cd885f908f97bab9b8032f554073071.zip gcc-7a17c5881cd885f908f97bab9b8032f554073071.tar.gz gcc-7a17c5881cd885f908f97bab9b8032f554073071.tar.bz2 | |
(find_reg): Store divide results in temporary variables.
From-SVN: r7778
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/global.c | 46 |
1 files changed, 27 insertions, 19 deletions
diff --git a/gcc/global.c b/gcc/global.c index 297e930..3f15cbe 100644 --- a/gcc/global.c +++ b/gcc/global.c @@ -1096,28 +1096,36 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying) if (local_reg_n_refs[regno] != 0 /* Don't use a reg no good for this pseudo. */ && ! TEST_HARD_REG_BIT (used2, regno) - && HARD_REGNO_MODE_OK (regno, mode) - && (((double) local_reg_n_refs[regno] - / local_reg_live_length[regno]) - < ((double) allocno_n_refs[allocno] - / allocno_live_length[allocno]))) + && HARD_REGNO_MODE_OK (regno, mode)) { - /* Hard reg REGNO was used less in total by local regs - than it would be used by this one allocno! */ - int k; - for (k = 0; k < max_regno; k++) - if (reg_renumber[k] >= 0) - { - int r = reg_renumber[k]; - int endregno - = r + HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (k)); + /* We explicitly evaluate the divide results into temporary + variables so as to avoid excess precision problems that occur + on a i386-unknown-sysv4.2 (unixware) host. */ + + double tmp1 = ((double) local_reg_n_refs[regno] + / local_reg_live_length[regno]); + double tmp2 = ((double) allocno_n_refs[allocno] + / allocno_live_length[allocno]); + + if (tmp1 < tmp2) + { + /* Hard reg REGNO was used less in total by local regs + than it would be used by this one allocno! */ + int k; + for (k = 0; k < max_regno; k++) + if (reg_renumber[k] >= 0) + { + int r = reg_renumber[k]; + int endregno + = r + HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (k)); - if (regno >= r && regno < endregno) - reg_renumber[k] = -1; - } + if (regno >= r && regno < endregno) + reg_renumber[k] = -1; + } - best_reg = regno; - break; + best_reg = regno; + break; + } } } } |