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Reinstated part of the patch that is safe 

From-SVN: r38966
This commit is contained in:
Alexandre Oliva 2001-01-12 22:48:35 +00:00 committed by Alexandre Oliva
parent c6ca5c693e
commit ec7c0481a0
2 changed files with 45 additions and 3 deletions
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3
gcc/ChangeLog
View File

@ -3,8 +3,7 @@
* calls.c (emit_library_call_value_1): Add USEs and CLOBBERs
to function usage for arguments passed by reference. Optimize
callee-copied arguments.
* regmove.c (find_related_toplev): Find uses in function usage.
(replace_in_call_usage): New function.
* regmove.c (replace_in_call_usage): New function.
(fixup_match_1): Call it.
* cse.c (cse_insn): Canonicalize registers in function usage.
* reload1.c (replace_pseudos_in_call_usage): New function.

45
gcc/regmove.c
View File

@ -1,6 +1,6 @@
/* Move registers around to reduce number of move instructions needed.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000 Free Software Foundation, Inc.
1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -1571,6 +1571,45 @@ find_matches (insn, matchp)
return any_matches;
}
/* Try to replace all occurrences of DST_REG with SRC in LOC, that is
assumed to be in INSN. */
static void
replace_in_call_usage (loc, dst_reg, src, insn)
rtx *loc;
int dst_reg;
rtx src;
rtx insn;
{
rtx x = *loc;
enum rtx_code code;
const char *fmt;
int i, j;
if (! x)
return;
code = GET_CODE (x);
if (code == REG)
{
if (REGNO (x) != dst_reg)
return;
validate_change (insn, loc, src, 1);
return;
}
/* Process each of our operands recursively. */
fmt = GET_RTX_FORMAT (code);
for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++)
if (*fmt == 'e')
replace_in_call_usage (&XEXP (x, i), dst_reg, src, insn);
else if (*fmt == 'E')
for (j = 0; j < XVECLEN (x, i); j++)
replace_in_call_usage (& XVECEXP (x, i, j), dst_reg, src, insn);
}
/* Try to replace output operand DST in SET, with input operand SRC. SET is
the only set in INSN. INSN has just been recognized and constrained.
SRC is operand number OPERAND_NUMBER in INSN.
@ -1643,6 +1682,10 @@ fixup_match_1 (insn, set, src, src_subreg, dst, backward, operand_number,
for (length = s_length = 0, p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
{
if (GET_CODE (p) == CALL_INSN)
replace_in_call_usage (& CALL_INSN_FUNCTION_USAGE (p),
REGNO (dst), src, p);
/* ??? We can't scan past the end of a basic block without updating
the register lifetime info (REG_DEAD/basic_block_live_at_start). */
if (perhaps_ends_bb_p (p))