diff options
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 13 |
1 files changed, 10 insertions, 3 deletions
@@ -691,7 +691,7 @@ static int check_dependence PARAMS ((rtx *, void *)); static void flush_hash_table PARAMS ((void)); static bool insn_live_p PARAMS ((rtx, int *)); static bool set_live_p PARAMS ((rtx, rtx, int *)); -static bool dead_libcall_p PARAMS ((rtx)); +static bool dead_libcall_p PARAMS ((rtx, int *)); /* Dump the expressions in the equivalence class indicated by CLASSP. This function is used only for debugging. */ @@ -7571,8 +7571,9 @@ insn_live_p (insn, counts) /* Return true if libcall is dead as a whole. */ static bool -dead_libcall_p (insn) +dead_libcall_p (insn, counts) rtx insn; + int *counts; { rtx note; /* See if there's a REG_EQUAL note on this insn and try to @@ -7589,11 +7590,17 @@ dead_libcall_p (insn) if (!new) new = XEXP (note, 0); + /* While changing insn, we must update the counts accordingly. */ + count_reg_usage (insn, counts, NULL_RTX, -1); + if (set && validate_change (insn, &SET_SRC (set), new, 0)) { + count_reg_usage (insn, counts, NULL_RTX, 1); remove_note (insn, find_reg_note (insn, REG_RETVAL, NULL_RTX)); + remove_note (insn, note); return true; } + count_reg_usage (insn, counts, NULL_RTX, 1); } return false; } @@ -7652,7 +7659,7 @@ delete_trivially_dead_insns (insns, nreg) { in_libcall = 1; live_insn = 1; - dead_libcall = dead_libcall_p (insn); + dead_libcall = dead_libcall_p (insn, counts); } else if (in_libcall) live_insn = ! dead_libcall; |