diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 18b7962..507b11e 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -10500,11 +10500,13 @@ static int recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes) { rtx pat = *pnewpat; + rtx pat_without_clobbers; int insn_code_number; int num_clobbers_to_add = 0; int i; - rtx notes = 0; + rtx notes = NULL_RTX; rtx old_notes, old_pat; + int old_icode; /* If PAT is a PARALLEL, check to see if it contains the CLOBBER we use to indicate that something didn't match. If we find such a @@ -10518,7 +10520,7 @@ recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes) old_pat = PATTERN (insn); old_notes = REG_NOTES (insn); PATTERN (insn) = pat; - REG_NOTES (insn) = 0; + REG_NOTES (insn) = NULL_RTX; insn_code_number = recog (pat, insn, &num_clobbers_to_add); if (dump_file && (dump_flags & TDF_DETAILS)) @@ -10564,6 +10566,9 @@ recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes) print_rtl_single (dump_file, pat); } } + + pat_without_clobbers = pat; + PATTERN (insn) = old_pat; REG_NOTES (insn) = old_notes; @@ -10605,6 +10610,35 @@ recog_for_combine (rtx *pnewpat, rtx insn, rtx *pnotes) pat = newpat; } + if (insn_code_number >= 0 + && insn_code_number != NOOP_MOVE_INSN_CODE) + { + old_pat = PATTERN (insn); + old_notes = REG_NOTES (insn); + old_icode = INSN_CODE (insn); + PATTERN (insn) = pat; + REG_NOTES (insn) = notes; + + /* Allow targets to reject combined insn. */ + if (!targetm.legitimate_combined_insn (insn)) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fputs ("Instruction not appropriate for target.", + dump_file); + + /* Callers expect recog_for_combine to strip + clobbers from the pattern on failure. */ + pat = pat_without_clobbers; + notes = NULL_RTX; + + insn_code_number = -1; + } + + PATTERN (insn) = old_pat; + REG_NOTES (insn) = old_notes; + INSN_CODE (insn) = old_icode; + } + *pnewpat = pat; *pnotes = notes; |