diff options
Diffstat (limited to 'gcc/reload1.c')
| -rw-r--r-- | gcc/reload1.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 7ba93a6..4543835 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -3098,12 +3098,7 @@ eliminate_regs_in_insn (rtx insn, int replace) if (GET_CODE (XEXP (plus_cst_src, 0)) == SUBREG) to_rtx = gen_lowpart (GET_MODE (XEXP (plus_cst_src, 0)), to_rtx); - /* If we have a nonzero offset, and the source is already - a simple REG, the following transformation would - increase the cost of the insn by replacing a simple REG - with (plus (reg sp) CST). So try only when we already - had a PLUS before. */ - if (offset == 0 || plus_src) + if (offset == 0) { int num_clobbers; /* We assume here that if we need a PARALLEL with @@ -3112,7 +3107,7 @@ eliminate_regs_in_insn (rtx insn, int replace) There's not much we can do if that doesn't work. */ PATTERN (insn) = gen_rtx_SET (VOIDmode, SET_DEST (old_set), - plus_constant (to_rtx, offset)); + to_rtx); num_clobbers = 0; INSN_CODE (insn) = recog (PATTERN (insn), insn, &num_clobbers); if (num_clobbers) @@ -3125,6 +3120,26 @@ eliminate_regs_in_insn (rtx insn, int replace) } gcc_assert (INSN_CODE (insn) >= 0); } + /* If we have a nonzero offset, and the source is already + a simple REG, the following transformation would + increase the cost of the insn by replacing a simple REG + with (plus (reg sp) CST). So try only when we already + had a PLUS before. */ + else if (plus_src) + { + new_body = old_body; + if (! replace) + { + new_body = copy_insn (old_body); + if (REG_NOTES (insn)) + REG_NOTES (insn) = copy_insn_1 (REG_NOTES (insn)); + } + PATTERN (insn) = new_body; + old_set = single_set (insn); + + XEXP (SET_SRC (old_set), 0) = to_rtx; + XEXP (SET_SRC (old_set), 1) = GEN_INT (offset); + } else break; |