diff options
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index d8e9d42..8c6ad5f 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -960,6 +960,20 @@ record_base_value (regno, val, invariant) reg_base_value[regno] = find_base_value (val); } +/* Clear alias info for a register. This is used if an RTL transformation + changes the value of a register. This is used in flow by AUTO_INC_DEC + optimizations. We don't need to clear reg_base_value, since flow only + changes the offset. */ + +void +clear_reg_alias_info (rtx reg) +{ + int regno = REGNO (reg); + + if (regno < reg_known_value_size) + reg_known_value[regno] = reg; +} + /* Returns a canonical version of X, from the point of view alias analysis. (For example, if X is a MEM whose address is a register, and the register has a known value (say a SYMBOL_REF), then a MEM |