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| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/combine.c | 19 |
2 files changed, 22 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e23395e..82649c55 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ 2002-02-14 Alexandre Oliva <aoliva@redhat.com> + * combine.c (known_cond): After replacing the REG of a SUBREG, try + to simplify it. + * function.c (assign_parms): Demote promoted argument passed by transparent reference. 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--) |