diff options
Diffstat (limited to 'gcc/regmove.c')
| -rw-r--r-- | gcc/regmove.c | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/gcc/regmove.c b/gcc/regmove.c index 5bd6f40..587b576 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -758,7 +758,6 @@ copy_src_to_dest (rtx insn, rtx src, rtx dest, int old_max_uid) if (REG_P (src) && REG_LIVE_LENGTH (REGNO (src)) > 0 && REG_P (dest) - && !RTX_UNCHANGING_P (dest) && REG_LIVE_LENGTH (REGNO (dest)) > 0 && (set = single_set (insn)) != NULL_RTX && !reg_mentioned_p (dest, SET_SRC (set)) @@ -1262,7 +1261,6 @@ regmove_optimize (rtx f, int nregs, FILE *regmove_dump_file) if (!REG_P (dst) || REGNO (dst) < FIRST_PSEUDO_REGISTER || REG_LIVE_LENGTH (REGNO (dst)) < 0 - || RTX_UNCHANGING_P (dst) || GET_MODE (src) != GET_MODE (dst)) continue; @@ -1657,12 +1655,6 @@ fixup_match_1 (rtx insn, rtx set, rtx src, rtx src_subreg, rtx dst, rtx src_note = find_reg_note (insn, REG_DEAD, src), dst_note = NULL_RTX; int length, s_length; - /* If SRC is marked as unchanging, we may not change it. - ??? Maybe we could get better code by removing the unchanging bit - instead, and changing it back if we don't succeed? */ - if (RTX_UNCHANGING_P (src)) - return 0; - if (! src_note) { /* Look for (set (regX) (op regA constX)) @@ -2039,10 +2031,7 @@ fixup_match_1 (rtx insn, rtx set, rtx src, rtx src_subreg, rtx dst, mentioning SRC or mentioning / changing DST . If in doubt, presume it is unstable. The rationale is that we want to check if we can move an insn easily - while just paying attention to SRC and DST. A register is considered - stable if it has the RTX_UNCHANGING_P bit set, but that would still - leave the burden to update REG_DEAD / REG_UNUSED notes, so we don't - want any registers but SRC and DST. */ + while just paying attention to SRC and DST. */ static int stable_and_no_regs_but_for_p (rtx x, rtx src, rtx dst) { |