diff options
Diffstat (limited to 'gcc/auto-inc-dec.c')
| -rw-r--r-- | gcc/auto-inc-dec.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/auto-inc-dec.c b/gcc/auto-inc-dec.c index 91fa5cf0bbe..db1bd5bba2c 100644 --- a/gcc/auto-inc-dec.c +++ b/gcc/auto-inc-dec.c @@ -769,6 +769,12 @@ parse_add_or_inc (rtx_insn *insn, bool before_mem) inc_insn.pat = pat; inc_insn.reg_res = SET_DEST (pat); inc_insn.reg0 = XEXP (SET_SRC (pat), 0); + + /* Block any auto increment of the frame pointer since it expands into + an addition and cannot be removed by copy propagation. */ + if (inc_insn.reg0 == frame_pointer_rtx) + return false; + if (rtx_equal_p (inc_insn.reg_res, inc_insn.reg0)) inc_insn.form = before_mem ? FORM_PRE_INC : FORM_POST_INC; else |