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| author | Richard Sandiford <rsandifo@redhat.com> | 2004-05-17 06:50:51 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2004-05-17 06:50:51 +0000 |
| commit | d83aba0f8b3bfec016bb62d146e022b15c35f1ca (patch) | |
| tree | 131eefbed273dab9a9fd55429e994aa6633bb521 /gcc/optabs.c | |
| parent | 15581992c8bbae7f8b4b75e088bcd61edc2355f3 (diff) | |
| download | gcc-d83aba0f8b3bfec016bb62d146e022b15c35f1ca.tar.gz | |
optabs.c (expand_unop): Try implementing negation using subtraction from zero.
* optabs.c (expand_unop): Try implementing negation using subtraction
from zero.
From-SVN: r81933
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index f89e053c456..562eb2902f9 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -2737,6 +2737,15 @@ expand_unop (enum machine_mode mode, optab unoptab, rtx op0, rtx target, return temp; } + /* If there is no negation pattern, try subtracting from zero. */ + if (unoptab == neg_optab && class == MODE_INT) + { + temp = expand_binop (mode, sub_optab, CONST0_RTX (mode), op0, + target, unsignedp, OPTAB_DIRECT); + if (temp) + return temp; + } + try_libcall: /* Now try a library call in this mode. */ if (unoptab->handlers[(int) mode].libfunc) |