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| author | Jeff Law <law@gcc.gnu.org> | 1993-05-05 17:34:48 -0600 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1993-05-05 17:34:48 -0600 |
| commit | 36a9c2e959284ad91b7266a2ab188e90b6460090 (patch) | |
| tree | 41127013820dc7e8b7c81b6bf4330ba750ed86ac /gcc | |
| parent | 194c082fed560df8e159d72303bdd10c77c109ea (diff) | |
| download | gcc-36a9c2e959284ad91b7266a2ab188e90b6460090.zip gcc-36a9c2e959284ad91b7266a2ab188e90b6460090.tar.gz gcc-36a9c2e959284ad91b7266a2ab188e90b6460090.tar.bz2 | |
combine.c (combinable_i3pat): Do not make REG_DEAD notes for the stack pointer, frame pointer or arg pointer.
* combine.c (combinable_i3pat): Do not make REG_DEAD notes for
the stack pointer, frame pointer or arg pointer.
From-SVN: r4345
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/combine.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index cd5936d..66375ff 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1043,9 +1043,18 @@ combinable_i3pat (i3, loc, i2dest, i1dest, i1_not_in_src, pi3dest_killed) return 0; /* If DEST is used in I3, it is being killed in this insn, - so record that for later. */ + so record that for later. + Never add REG_DEAD notes for the FRAME_POINTER_REGNUM or the + STACK_POINTER_REGNUM, since these are always considered to be + live. Similarly for ARG_POINTER_REGNUM if it is fixed. */ if (pi3dest_killed && GET_CODE (dest) == REG - && reg_referenced_p (dest, PATTERN (i3))) + && reg_referenced_p (dest, PATTERN (i3)) + && REGNO (dest) != FRAME_POINTER_REGNUM +#if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM + && (REGNO (dest) != ARG_POINTER_REGNUM + || ! fixed_regs [REGNO (dest)]) +#endif + && REGNO (dest) != STACK_POINTER_REGNUM) { if (*pi3dest_killed) return 0; |