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| 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/loop.c | |
| parent | c2a8530e21c7a3bc4824d00e0bb8ff39009da43a (diff) | |
| download | gcc-3d8504ac3262976d2c63d547a07aef0874f530b6.zip gcc-3d8504ac3262976d2c63d547a07aef0874f530b6.tar.gz gcc-3d8504ac3262976d2c63d547a07aef0874f530b6.tar.bz2 | |
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/loop.c')
| -rw-r--r-- | gcc/loop.c | 13 |
1 files changed, 13 insertions, 0 deletions
@@ -1222,6 +1222,12 @@ scan_loop (struct loop *loop, int flags) if (GET_MODE_CLASS (GET_MODE (SET_DEST (set))) == MODE_CC && CONSTANT_P (src)) ; +#ifdef STACK_REGS + /* Don't hoist constant pool constants into stack regs. */ + else if (IS_STACK_MODE (GET_MODE (SET_SRC (set))) + && constant_pool_constant_p (SET_SRC (set))) + ; +#endif /* Don't try to optimize a register that was made by loop-optimization for an inner loop. We don't know its life-span, so we can't compute @@ -10823,6 +10829,13 @@ load_mems (const struct loop *loop) && SCALAR_FLOAT_MODE_P (GET_MODE (mem))) loop_info->mems[i].optimize = 0; +#ifdef STACK_REGS + /* Don't hoist constant pool constants into stack registers. */ + if (IS_STACK_MODE (GET_MODE (mem)) + && constant_pool_constant_p (mem)) + loop_info->mems[i].optimize = 0; +#endif + /* If this MEM is written to, we must be sure that there are no reads from another MEM that aliases this one. */ if (loop_info->mems[i].optimize && written) |