diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 15 |
2 files changed, 20 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2ebc0bd..c14e729 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2002-05-13 Jeffrey A Law (law@redhat.com) + + * i386.c (TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD): Define. + (ia32_multipass_dfa_lookahead): New function. + 2002-05-13 Neil Booth <neil@daikokuya.demon.co.uk> * gcc.c (SWITCH_TAKES_ARG): Remove 'V'. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index b3c7671..3ed816e 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -48,6 +48,8 @@ static int ia32_use_dfa_pipeline_interface PARAMS ((void)); #undef TARGET_SCHED_USE_DFA_PIPELINE_INTERFACE #define TARGET_SCHED_USE_DFA_PIPELINE_INTERFACE ia32_use_dfa_pipeline_interface +#undef TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD +#define TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD ia32_multipass_dfa_lookahead static int ia32_use_dfa_pipeline_interface () @@ -57,6 +59,19 @@ ia32_use_dfa_pipeline_interface () return 0; } +/* How many alternative schedules to try. This should be as wide as the + scheduling freedom in the DFA, but no wider. Making this value too + large results extra work for the scheduler. */ + +static int +ia32_multipass_dfa_lookahead () +{ + if (ix86_cpu == PROCESSOR_PENTIUM) + return 2; + else + return 0; +} + #ifndef CHECK_STACK_LIMIT #define CHECK_STACK_LIMIT (-1) #endif |