diff options
| author | Roger Sayle <roger@eyesopen.com> | 2006-02-19 22:01:17 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2006-02-19 22:01:17 +0000 |
| commit | 3d8504ac3262976d2c63d547a07aef0874f530b6 (patch) | |
| tree | 548133d8c92115bf18fa7c2d6f3e7800dbd456bb /gcc/gcse.c | |
| parent | c2a8530e21c7a3bc4824d00e0bb8ff39009da43a (diff) | |
| download | gcc-3d8504ac3262976d2c63d547a07aef0874f530b6.tar.gz | |
gcse.c (want_to_gcse_p): On STACK_REGS targets...
* gcse.c (want_to_gcse_p): On STACK_REGS targets, look through
constant pool references to identify stack mode constants.
* rtlanal.c (constant_pool_constant_p): New predicate to check
whether operand is a floating point constant in the pool.
* rtl.h (constant_pool_constant_p): Prototype here.
* loop.c (scan_loop): Avoid hoisting constants from the constant
pool on STACK_REGS targets.
(load_mems): Likewise.
* loop-invariant.c (get_inv_cost): Make hoisting constant pool
loads into x87 registers expensive in terms of register pressure.
Co-Authored-By: Steven Bosscher <stevenb.gcc@gmail.com>
From-SVN: r111283
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/gcse.c b/gcc/gcse.c index 93c366b7dbe..42707373779 100644 --- a/gcc/gcse.c +++ b/gcc/gcse.c @@ -1170,6 +1170,14 @@ static basic_block current_bb; static int want_to_gcse_p (rtx x) { +#ifdef STACK_REGS + /* On register stack architectures, don't GCSE constants from the + constant pool, as the benefits are often swamped by the overhead + of shuffling the register stack between basic blocks. */ + if (IS_STACK_MODE (GET_MODE (x))) + x = avoid_constant_pool_reference (x); +#endif + switch (GET_CODE (x)) { case REG: |