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| author | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 1993-12-14 01:58:37 +0000 |
|---|---|---|
| committer | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 1993-12-14 01:58:37 +0000 |
| commit | 7ca23dda58bd6ed87024374f379edf4a5dbbc076 (patch) | |
| tree | 4b31f36d4e3827f8a947d86dc8565ca71c0b6d0e /gcc/combine.c | |
| parent | fda38c1fcec8a2128c900067c9a8e68363e9829d (diff) | |
| download | gcc-7ca23dda58bd6ed87024374f379edf4a5dbbc076.tar.gz | |
(subst, case MINUS): Canonicalize (minus A (plus A B)).
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@6226 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index f4da033f10c..801d26c8964 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -3564,6 +3564,17 @@ subst (x, from, to, in_dest, unique_copy) - INTVAL (XEXP (XEXP (x, 1), 1)) - 1); goto restart; } + + /* Canonicalize (minus A (plus B C)) to (minus (minus A B) C) for + integers. */ + if (GET_CODE (XEXP (x, 1)) == PLUS && INTEGRAL_MODE_P (mode)) + { + x = gen_binary (MINUS, mode, + gen_binary (MINUS, mode, XEXP (x, 0), + XEXP (XEXP (x, 1), 0)), + XEXP (XEXP (x, 1), 1)); + goto restart; + } break; case MULT: |