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| author | Rask Ingemann Lambertsen <rask@sygehus.dk> | 2007-09-09 21:21:59 +0200 |
|---|---|---|
| committer | Rask Ingemann Lambertsen <rask@gcc.gnu.org> | 2007-09-09 19:21:59 +0000 |
| commit | 921c44189aae73ef85ea7ac4712e54f667fdd4f6 (patch) | |
| tree | 9cf93feb394109316dfdca4d1a5926ddbe2320f6 /gcc/simplify-rtx.c | |
| parent | 0098d8068657d4d1aa61585993a0a3e5ef6be2c8 (diff) | |
| download | gcc-921c44189aae73ef85ea7ac4712e54f667fdd4f6.zip gcc-921c44189aae73ef85ea7ac4712e54f667fdd4f6.tar.gz gcc-921c44189aae73ef85ea7ac4712e54f667fdd4f6.tar.bz2 | |
re PR target/30315 (optimize unsigned-add overflow test on x86 to use cpu flags from addl)
PR target/30315
* config/i386/i386.h (CANONICALIZE_COMPARISON): Delete.
* simplify-rtx.c (simplify_relational_operation_1): Add the
canonicalization from i386.h.
* doc/md.texi (Canonicalization of Instructions): Document it.
From-SVN: r128305
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index ac91f2f..02f9e2b 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -3813,6 +3813,12 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode, } } + /* Canonicalize (LTU/GEU (PLUS a b) b) as (LTU/GEU (PLUS a b) a). */ + if ((code == LTU || code == GEU) + && GET_CODE (op0) == PLUS + && rtx_equal_p (op1, XEXP (op0, 1))) + return simplify_gen_relational (code, mode, cmp_mode, op0, XEXP (op0, 0)); + if (op1 == const0_rtx) { /* Canonicalize (GTU x 0) as (NE x 0). */ |