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loop.c (maybe_eliminate_biv): For libcalls that set a giv, skip to end of libcall.

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* loop.c (maybe_eliminate_biv): For libcalls that set a giv, skip to
	end of libcall.

From-SVN: r26056
This commit is contained in:
J"orn Rennecke 1999-03-29 11:56:45 +00:00 committed by Joern Rennecke
parent aa4778b684
commit fdb1833aca
2 changed files with 25 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Mar 29 20:52:47 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (maybe_eliminate_biv): For libcalls that set a giv, skip to
end of libcall.
Mon Mar 29 20:35:49 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* sh.md (mulsi3): Tag an extra REG_EQUAL note to the middle insn.

20
gcc/loop.c
View File

@ -8121,6 +8121,26 @@ maybe_eliminate_biv (bl, loop_start, end, eliminate_p, threshold, insn_count)
enum rtx_code code = GET_CODE (p);
rtx where = threshold >= insn_count ? loop_start : p;
/* If this is a libcall that sets a giv, skip ahead to its end. */
if (GET_RTX_CLASS (code) == 'i')
{
rtx note = find_reg_note (p, REG_LIBCALL, NULL_RTX);
if (note)
{
rtx last = XEXP (note, 0);
rtx set = single_set (last);
if (set && GET_CODE (SET_DEST (set)) == REG)
{
int regno = REGNO (SET_DEST (set));
if (REG_IV_TYPE (regno) == GENERAL_INDUCT
&& REG_IV_INFO (regno)->src_reg == bl->biv->src_reg)
p = last;
}
}
}
if ((code == INSN || code == JUMP_INSN || code == CALL_INSN)
&& reg_mentioned_p (reg, PATTERN (p))
&& ! maybe_eliminate_biv_1 (PATTERN (p), p, bl, eliminate_p, where))