diff options
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 13 |
1 files changed, 8 insertions, 5 deletions
@@ -3166,7 +3166,7 @@ emit_move_insn (x, y) { enum machine_mode mode = GET_MODE (x); rtx y_cst = NULL_RTX; - rtx last_insn; + rtx last_insn, set; x = protect_from_queue (x, 1); y = protect_from_queue (y, 0); @@ -3184,9 +3184,10 @@ emit_move_insn (x, y) && (last_insn = compress_float_constant (x, y))) return last_insn; + y_cst = y; + if (!LEGITIMATE_CONSTANT_P (y)) { - y_cst = y; y = force_const_mem (mode, y); /* If the target's cannot_force_const_mem prevented the spill, @@ -3217,7 +3218,10 @@ emit_move_insn (x, y) last_insn = emit_move_insn_1 (x, y); - if (y_cst && GET_CODE (x) == REG) + if (y_cst && GET_CODE (x) == REG + && (set = single_set (last_insn)) != NULL_RTX + && SET_DEST (set) == x + && ! rtx_equal_p (y_cst, SET_SRC (set))) set_unique_reg_note (last_insn, REG_EQUAL, y_cst); return last_insn; @@ -3621,8 +3625,7 @@ compress_float_constant (x, y) last_insn = get_last_insn (); if (GET_CODE (x) == REG) - REG_NOTES (last_insn) - = gen_rtx_EXPR_LIST (REG_EQUAL, y, REG_NOTES (last_insn)); + set_unique_reg_note (last_insn, REG_EQUAL, y); return last_insn; } |