diff options
| author | dalej <dalej@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-03-16 20:42:37 +0000 |
|---|---|---|
| committer | dalej <dalej@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-03-16 20:42:37 +0000 |
| commit | a6971e982119af18c653122215d5b86bd329bd88 (patch) | |
| tree | 99aa1333d8e8d2fd4c95bfdca522410c2fd65374 /gcc/rtlanal.c | |
| parent | d5c3b1aff6f79663b7f12efd0d6a86fbd4c6b731 (diff) | |
| download | gcc-a6971e982119af18c653122215d5b86bd329bd88.tar.gz | |
2005-03-16 Dale Johannesen <dalej@apple.com>
* rtlanal.c (find_first_parameter_load): Rewrite to
return actual first param load or the call if none,
instead of first in block, when not all loads exist.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@96578 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/rtlanal.c')
| -rw-r--r-- | gcc/rtlanal.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 79121d48b78..0686af8c65b 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -3159,12 +3159,15 @@ parms_set (rtx x, rtx pat ATTRIBUTE_UNUSED, void *data) } /* Look backward for first parameter to be loaded. + Note that loads of all parameters will not necessarily be + found if CSE has eliminated some of them (e.g., an argument + to the outer function is passed down as a parameter). Do not skip BOUNDARY. */ rtx find_first_parameter_load (rtx call_insn, rtx boundary) { struct parms_set_data parm; - rtx p, before; + rtx p, before, first_set; /* Since different machines initialize their parameter registers in different orders, assume nothing. Collect the set of all @@ -3186,6 +3189,7 @@ find_first_parameter_load (rtx call_insn, rtx boundary) parm.nregs++; } before = call_insn; + first_set = call_insn; /* Search backward for the first set of a register in this set. */ while (parm.nregs && before != boundary) @@ -3208,9 +3212,20 @@ find_first_parameter_load (rtx call_insn, rtx boundary) } if (INSN_P (before)) - note_stores (PATTERN (before), parms_set, &parm); + { + int nregs_old = parm.nregs; + note_stores (PATTERN (before), parms_set, &parm); + /* If we found something that did not set a parameter reg, + we're done. Do not keep going, as that might result + in hoisting an insn before the setting of a pseudo + that is used by the hoisted insn. */ + if (nregs_old != parm.nregs) + first_set = before; + else + break; + } } - return before; + return first_set; } /* Return true if we should avoid inserting code between INSN and preceding |