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| author | Quentin Carbonneaux <quentin.carbonneaux@yale.edu> | 2015-08-05 16:13:18 -0400 |
|---|---|---|
| committer | Quentin Carbonneaux <quentin.carbonneaux@yale.edu> | 2015-09-15 23:01:30 -0400 |
| commit | 078522cf5d5b7adbe56fb1300e47f642616354d5 (patch) | |
| tree | e41677dd1e65b21bebc2d25f7a1b5a069b9f7de8 /lisc/isel.c | |
| parent | dba612623fcd5c58569ef8ac32085e8aacaef435 (diff) | |
| download | roux-078522cf5d5b7adbe56fb1300e47f642616354d5.tar.gz | |
use a temporary for constant comparisons
Diffstat (limited to 'lisc/isel.c')
| -rw-r--r-- | lisc/isel.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/lisc/isel.c b/lisc/isel.c index faea3b5..ea4aa01 100644 --- a/lisc/isel.c +++ b/lisc/isel.c @@ -86,15 +86,25 @@ sel(Ins i, Fn *fn) break; default: if (OCmp <= i.op && i.op <= OCmp1) { + r0 = i.arg[0]; c = i.op - OCmp; if (rtype(i.arg[0]) == RCon) { - r0 = i.arg[0]; - i.arg[0] = i.arg[1]; - i.arg[1] = r0; - c = CNEG(c); + if (rtype(i.arg[1]) == RCon) { + /* todo, use the constant + * size to dimension the + * constant */ + t = newtmp(TWord, fn); + r0 = TMP(t); + } else { + r0 = i.arg[1]; + i.arg[1] = i.arg[0]; + c = CNEG(c); + } } emit(OXSet+c, i.to, R, R); - emit(OXCmp, R, i.arg[1], i.arg[0]); + emit(OXCmp, R, i.arg[1], r0); + if (!req(r0, i.arg[0])) + emit(OCopy, r0, i.arg[0], R); break; } diag("isel: non-exhaustive implementation"); |