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| author | Richard Henderson <rth@cygnus.com> | 1997-10-16 15:06:43 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 1997-10-16 15:06:43 -0700 |
| commit | b79ee7eb70cf8d352424531e73fdc14398d233ab (patch) | |
| tree | f7106aca95b69b471bb0493600b7fc23327305f4 /gcc | |
| parent | 5c19a35643bd0c7d5a2766a5b91f6b6b4cb7242d (diff) | |
| download | gcc-b79ee7eb70cf8d352424531e73fdc14398d233ab.zip gcc-b79ee7eb70cf8d352424531e73fdc14398d233ab.tar.gz gcc-b79ee7eb70cf8d352424531e73fdc14398d233ab.tar.bz2 | |
combine.c (can_combine_p): Don't combine with an asm whose output is a hard register.
* combine.c (can_combine_p): Don't combine with an asm whose
output is a hard register.
From-SVN: r15940
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/combine.c | 7 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 32a3239..fb1218f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Oct 16 15:07:51 1997 Richard Henderson <rth@cygnus.com> + + * combine.c (can_combine_p): Don't combine with an asm whose + output is a hard register. + Thu Oct 16 15:43:26 1997 Mike Stump (mrs@wrs.com) * c-decl.c (start_struct): Ensure that structs with forward diff --git a/gcc/combine.c b/gcc/combine.c index 2ef88c0..3626e48 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1003,6 +1003,13 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc) && p != succ && volatile_refs_p (PATTERN (p))) return 0; + /* If INSN is an asm, and DEST is a hard register, reject, since it has + to be an explicit register variable, and was chosen for a reason. */ + + if (GET_CODE (src) == ASM_OPERANDS + && GET_CODE (dest) == REG && REGNO (dest) < FIRST_PSEUDO_REGISTER) + return 0; + /* If there are any volatile insns between INSN and I3, reject, because they might affect machine state. */ |