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regmove.c (regmove_optimize): Avoid setting a register twice in a parallel set.

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* regmove.c (regmove_optimize): Avoid setting a register twice in
        a parallel set.

Co-Authored-By: Richard Henderson <rth@redhat.com>

From-SVN: r44785
This commit is contained in:
Roman Zippel 2001-08-11 01:05:24 +00:00 • committed by Richard Henderson
parent cbf4c36fa3
commit bb948ad31d
2 changed files with 14 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2001-08-10 Roman Zippel <zippel@linux-m68k.org>
Richard Henderson <rth@redhat.com>
* regmove.c (regmove_optimize): Avoid setting a register twice in
a parallel set.
2001-08-10 Richard Henderson <rth@redhat.com>
* doc/extend.texi (Arrays and pointers implementation): Document

8
gcc/regmove.c
View file

@ -1319,6 +1319,14 @@ regmove_optimize (f, nregs, regmove_dump_file)
if (! set)
continue;
/* Note that single_set ignores parts of a parallel set for
which one of the destinations is REG_UNUSED. We can't
handle that here, since we can wind up rewriting things
such that a single register is set twice within a single
parallel. */
if (reg_set_p (src, insn))
continue;
/* match_no/dst must be a write-only operand, and
operand_operand/src must be a read-only operand. */
if (match.use[op_no] != READ