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| author | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-03-29 11:56:45 +0000 |
|---|---|---|
| committer | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-03-29 11:56:45 +0000 |
| commit | 092aa66ff178f8b757973c164357a255af5b1a18 (patch) | |
| tree | f30603a88d3538b8e75b6362181fbee7df011d25 /gcc/loop.c | |
| parent | 82f4ebf64cc27db125f4040bb1533c02d9015f27 (diff) | |
| download | ppe42-gcc-092aa66ff178f8b757973c164357a255af5b1a18.tar.gz ppe42-gcc-092aa66ff178f8b757973c164357a255af5b1a18.zip | |
* loop.c (maybe_eliminate_biv): For libcalls that set a giv, skip to
end of libcall.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26056 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index 7b6ec8de6e2..a626784a02a 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -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)) |
