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| author | Alexandre Oliva <aoliva@redhat.com> | 2002-02-14 19:30:42 +0000 |
|---|---|---|
| committer | Alexandre Oliva <aoliva@gcc.gnu.org> | 2002-02-14 19:30:42 +0000 |
| commit | 9a360704f9edf14fd0dd3a04dcf16923164c09b2 (patch) | |
| tree | 637c1d0aecd771902516754e8b88d908a13dfb1b /gcc/combine.c | |
| parent | 4606272bc4fd9daccd4723530a650822a8527671 (diff) | |
| download | gcc-9a360704f9edf14fd0dd3a04dcf16923164c09b2.zip gcc-9a360704f9edf14fd0dd3a04dcf16923164c09b2.tar.gz gcc-9a360704f9edf14fd0dd3a04dcf16923164c09b2.tar.bz2 | |
combine.c (known_cond): After replacing the REG of a SUBREG, try to simplify it.
* combine.c (known_cond): After replacing the REG of a SUBREG, try
to simplify it.
From-SVN: r49775
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index ba0bf35..5abda2e 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -7430,6 +7430,25 @@ known_cond (x, cond, reg, val) } } } + else if (code == SUBREG) + { + enum machine_mode inner_mode = GET_MODE (SUBREG_REG (x)); + rtx new, r = known_cond (SUBREG_REG (x), cond, reg, val); + + if (SUBREG_REG (x) != r) + { + /* We must simplify subreg here, before we lose track of the + original inner_mode. */ + new = simplify_subreg (GET_MODE (x), r, + inner_mode, SUBREG_BYTE (x)); + if (new) + return new; + else + SUBST (SUBREG_REG (x), r); + } + + return x; + } fmt = GET_RTX_FORMAT (code); for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) |