MIPS SB-1 DFA scheduler.

MIPS SB-1 DFA scheduler.

* config/mips/mips-protos.h (fp_register_operand, lo_operand): Declare.
* config/mips/mips.c (mips_multipass_dfa_lookahead): Declare.
(TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD): New.
(fp_register_operand, lo_operand): New.
(mips_rtx_costs): Add TUNE_SB1 support.
(mips_issue_rate): Add comment.  Add PROCESSOR_SB1 support.
(mips_use_dfa_pipeline_interface): Add PROCESSOR_SB1 support.
(mips_multipass_dfa_lookahead): New.
* config/mips/mips.h (MASK_FP_EXCEPTIONS, TARGET_FP_EXCEPTIONS,
TUNE_SB1): New.
(TARGET_SWITCHES): Add -mfp-exceptions support.
(TARGET_FP_EXCEPTIONS_DEFAULT): New.
(BRANCH_COST): Fix whitespace.
* config/mips/mips.md: Include sb1.md.
* config/mips/sb1.md: New file.
* doc/invoke.texi: Document -mfp-exceptions.

From-SVN: r80988