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| author | Jan Hubicka <jh@suse.cz> | 2001-07-29 21:44:42 +0200 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2001-07-29 19:44:42 +0000 |
| commit | b5832b43726d2d44b202c7a5669b3e97a2bc60c2 (patch) | |
| tree | 19cc9892c443cb833b456226ee6217fae10f6a91 /gcc/combine.c | |
| parent | 12285d9df86f4fa4ece1667265fe129e25287907 (diff) | |
| download | gcc-b5832b43726d2d44b202c7a5669b3e97a2bc60c2.zip gcc-b5832b43726d2d44b202c7a5669b3e97a2bc60c2.tar.gz gcc-b5832b43726d2d44b202c7a5669b3e97a2bc60c2.tar.bz2 | |
Suggested by Richard Henderson and Richard Kenner:
* combine.c (recog_for_combine): Use the fake recog
only if instruction does not match.
* rtl.h (NOOP_MOVE_INSN_CODE): New.
* rtlanal.c (noop_move_p): Always return 1 for NOOP_MOVE_INSN_CODE.
* combine.c (try_combine): Discover noop jump as direct jump.
From-SVN: r44464
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 657a929..4ece85a 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2763,7 +2763,10 @@ try_combine (i3, i2, i1, new_direct_jump_p) BARRIER following it since it may have initially been a conditional jump. It may also be the last nonnote insn. */ - if (GET_CODE (newpat) == RETURN || any_uncondjump_p (i3)) + if (GET_CODE (newpat) == RETURN || any_uncondjump_p (i3) + || (GET_CODE (newpat) == SET + && SET_SRC (newpat) == pc_rtx + && SET_DEST (newpat) == pc_rtx)) { *new_direct_jump_p = 1; @@ -9600,12 +9603,7 @@ recog_for_combine (pnewpat, insn, pnotes) old_notes = REG_NOTES (insn); REG_NOTES (insn) = 0; - /* Is the result of combination a valid instruction? - Recognize all noop sets, these will be killed by followup pass. */ - if (GET_CODE (pat) == SET && set_noop_p (pat)) - insn_code_number = INT_MAX; - else - insn_code_number = recog (pat, insn, &num_clobbers_to_add); + insn_code_number = recog (pat, insn, &num_clobbers_to_add); /* If it isn't, there is the possibility that we previously had an insn that clobbered some register as a side effect, but the combined @@ -9630,13 +9628,13 @@ recog_for_combine (pnewpat, insn, pnotes) if (pos == 1) pat = XVECEXP (pat, 0, 0); - /* Recognize all noop sets, these will be killed by followup pass. */ - if (GET_CODE (pat) == SET && set_noop_p (pat)) - insn_code_number = INT_MAX; - else - insn_code_number = recog (pat, insn, &num_clobbers_to_add); + insn_code_number = recog (pat, insn, &num_clobbers_to_add); } + /* Recognize all noop sets, these will be killed by followup pass. */ + if (insn_code_number < 0 && GET_CODE (pat) == SET && set_noop_p (pat)) + insn_code_number = NOOP_MOVE_INSN_CODE, num_clobbers_to_add = 0; + REG_NOTES (insn) = old_notes; /* If we had any clobbers to add, make a new pattern than contains |