diff options
Diffstat (limited to 'gcc/regrename.cc')
| -rw-r--r-- | gcc/regrename.cc | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/regrename.cc b/gcc/regrename.cc index 7de8881..cb03c1d 100644 --- a/gcc/regrename.cc +++ b/gcc/regrename.cc @@ -1117,6 +1117,12 @@ scan_rtx_reg (rtx_insn *insn, rtx *loc, enum reg_class cl, enum scan_actions act unsigned this_regno = REGNO (x); int this_nregs = REG_NREGS (x); + /* Do not process write actions for the second instruction of + a macro-fused pair of two single_sets. */ + if ((action == mark_write || action == terminate_write) + && single_output_fused_pair_p (insn)) + return; + if (action == mark_write) { if (type == OP_OUT) @@ -1153,7 +1159,9 @@ scan_rtx_reg (rtx_insn *insn, rtx *loc, enum reg_class cl, enum scan_actions act return; } - if ((type == OP_OUT) != (action == terminate_write || action == mark_access)) + if ((type == OP_OUT) != (action == terminate_write || action == mark_access) + && ! (type == OP_OUT && action == mark_read + && single_output_fused_pair_p (insn))) return; for (p = &open_chains; *p;) |