diff options
Diffstat (limited to 'gcc/df-problems.c')
| -rw-r--r-- | gcc/df-problems.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/gcc/df-problems.c b/gcc/df-problems.c index e0ec167..fb89909 100644 --- a/gcc/df-problems.c +++ b/gcc/df-problems.c @@ -3745,9 +3745,22 @@ df_simulate_find_defs (rtx insn, bitmap defs) for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++) { df_ref def = *def_rec; - /* If the def is to only part of the reg, it does - not kill the other defs that reach here. */ - if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL))) + bitmap_set_bit (defs, DF_REF_REGNO (def)); + } +} + +/* Find the set of real DEFs, which are not clobbers, for INSN. */ + +void +df_simulate_find_noclobber_defs (rtx insn, bitmap defs) +{ + df_ref *def_rec; + unsigned int uid = INSN_UID (insn); + + for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++) + { + df_ref def = *def_rec; + if (!(DF_REF_FLAGS (def) & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER))) bitmap_set_bit (defs, DF_REF_REGNO (def)); } } @@ -3939,7 +3952,7 @@ df_simulate_one_insn_forwards (basic_block bb, rtx insn, bitmap live) while here the scan is performed forwards! So, first assume that the def is live, and if this is not true REG_UNUSED notes will rectify the situation. */ - df_simulate_find_defs (insn, live); + df_simulate_find_noclobber_defs (insn, live); /* Clear all of the registers that go dead. */ for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) |