diff options
Diffstat (limited to 'gcc/regclass.c')
| -rw-r--r-- | gcc/regclass.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/gcc/regclass.c b/gcc/regclass.c index 84bf97f21db..08051cdb642 100644 --- a/gcc/regclass.c +++ b/gcc/regclass.c @@ -1317,7 +1317,7 @@ regclass (f, nregs, dump) /* In non-optimizing compilation REG_N_REFS is not initialized yet. */ - if (optimize && !REG_N_REFS (i)) + if (optimize && !REG_N_REFS (i) && !REG_N_SETS (i)) continue; for (class = (int) ALL_REGS - 1; class > 0; class--) @@ -2397,6 +2397,8 @@ reg_scan_mark_refs (x, insn, note_flag, min_regno) rtx dest; rtx note; + if (!x) + return; code = GET_CODE (x); switch (code) { @@ -2423,6 +2425,10 @@ reg_scan_mark_refs (x, insn, note_flag, min_regno) REGNO_LAST_UID (regno) = INSN_UID (insn); if (REGNO_FIRST_UID (regno) == 0) REGNO_FIRST_UID (regno) = INSN_UID (insn); + /* If we are called by reg_scan_update() (indicated by min_regno + being set), we also need to update the reference count. */ + if (min_regno) + REG_N_REFS (regno)++; } } break; @@ -2439,6 +2445,18 @@ reg_scan_mark_refs (x, insn, note_flag, min_regno) reg_scan_mark_refs (XEXP (x, 1), insn, note_flag, min_regno); break; + case CLOBBER: + { + rtx reg = XEXP (x, 0); + if (REG_P (reg) + && REGNO (reg) >= min_regno) + { + REG_N_SETS (REGNO (reg))++; + REG_N_REFS (REGNO (reg))++; + } + } + break; + case SET: /* Count a set of the destination if it is a register. */ for (dest = SET_DEST (x); |