diff options
Diffstat (limited to 'gcc/regcprop.c')
| -rw-r--r-- | gcc/regcprop.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/regcprop.c b/gcc/regcprop.c index ddc6252f53a..367d85a7e24 100644 --- a/gcc/regcprop.c +++ b/gcc/regcprop.c @@ -396,6 +396,13 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode, && GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (new_mode)) return NULL_RTX; + /* Avoid creating multiple copies of the stack pointer. Some ports + assume there is one and only one stack pointer. + + It's unclear if we need to do the same for other special registers. */ + if (regno == STACK_POINTER_REGNUM) + return NULL_RTX; + if (orig_mode == new_mode) return gen_raw_REG (new_mode, regno); else if (mode_change_ok (orig_mode, new_mode, regno)) |