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| author | Roger Sayle <roger@eyesopen.com> | 2006-08-28 00:58:47 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2006-08-28 00:58:47 +0000 |
| commit | 7f22b9fca4fea70b3d837e7c6abcb14bd1509b18 (patch) | |
| tree | 6902ad2ae6e9fab267f6a4b7f65ead0c472b62f6 /gcc/ifcvt.c | |
| parent | b27788aa43dc259a5aa321c8e0719f4982fe7c89 (diff) | |
| download | gcc-7f22b9fca4fea70b3d837e7c6abcb14bd1509b18.zip gcc-7f22b9fca4fea70b3d837e7c6abcb14bd1509b18.tar.gz gcc-7f22b9fca4fea70b3d837e7c6abcb14bd1509b18.tar.bz2 | |
ifcvt.c (cheap_bb_rtx_cost_p): Don't speculatively execute x87 instructions.
* ifcvt.c (cheap_bb_rtx_cost_p): Don't speculatively execute
x87 instructions.
From-SVN: r116501
Diffstat (limited to 'gcc/ifcvt.c')
| -rw-r--r-- | gcc/ifcvt.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index 4787a24..987a2fb 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -1,5 +1,5 @@ /* If-conversion support. - Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 + Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. This file is part of GCC. @@ -153,14 +153,16 @@ cheap_bb_rtx_cost_p (basic_block bb, int max_cost) /* If this instruction is the load or set of a "stack" register, such as a floating point register on x87, then the cost of - speculatively executing this instruction needs to include - the additional cost of popping this register off of the - register stack. */ + speculatively executing this insn may need to include + the additional cost of popping its result off of the + register stack. Unfortunately, correctly recognizing and + accounting for this additional overhead is tricky, so for + now we simply prohibit such speculative execution. */ #ifdef STACK_REGS { rtx set = single_set (insn); if (set && STACK_REG_P (SET_DEST (set))) - cost += COSTS_N_INSNS (1); + return false; } #endif |