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| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-10-10 10:57:01 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-10-10 10:57:01 -0400 |
| commit | ff12fdac9b0679941912411b85263c7eba027a64 (patch) | |
| tree | 433c8d35c3299fdc0cfe39525335b624c54c54d7 /gcc/combine.c | |
| parent | 888184ea7e1da391c8cf8ae43923461c4b384629 (diff) | |
| download | gcc-ff12fdac9b0679941912411b85263c7eba027a64.zip gcc-ff12fdac9b0679941912411b85263c7eba027a64.tar.gz gcc-ff12fdac9b0679941912411b85263c7eba027a64.tar.bz2 | |
(subst, case SUREG):Only call force_to_mode if both inner and output
modes are MODE_INT.
From-SVN: r5709
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index abc224c..4d05b01 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -3177,11 +3177,13 @@ subst (x, from, to, in_dest, unique_copy) ) return gen_lowpart_for_combine (mode, SUBREG_REG (x)); - /* If we are narrowing the object, we need to see if we can simplify - the expression for the object knowing that we only need the + /* If we are narrowing an integral object, we need to see if we can + simplify the expression for the object knowing that we only need the low-order bits. */ - if (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) + if (GET_MODE_CLASS (mode) == MODE_INT + && GET_MODE_CLASS (GET_MODE (SUBREG_REG (x))) == MODE_INT + && GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) && subreg_lowpart_p (x)) return force_to_mode (SUBREG_REG (x), mode, GET_MODE_MASK (mode), NULL_RTX); |