2007-07-16 Sandra Loosemore <sandra@codesourcery.com>

	    Nigel Stephens  <nigel@mips.com>

        gcc/

	* config/mips/mips.md:  Include 20kc.md.
	* config/mips/20kc.md: New file.
	* config/mips/mips.c (mips_rtx_cost_data): Fill in 20Kc costs.
	(mips_adjust_cost): Tweak for 20Kc.
	(mips_issue_rate): Likewise.
	* config/mips/mips.h (TUNE_20KC): Define.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@126687 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 266 insertions, 0 deletions

diff --git a/gcc/config/mips/20kc.md b/gcc/config/mips/20kc.md
new file mode 100644
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+++ b/gcc/config/mips/20kc.md
@@ -0,0 +1,266 @@
+;; .........................
+;;
+;; DFA-based pipeline description for MIPS64 model R20Kc.
+;; Contributed by Jason Eckhardt (jle@cygnus.com).
+;;
+;; The R20Kc is a dual-issue processor that can generally bundle
+;; instructions as follows:
+;;   1. integer with integer
+;;   2. integer with fp
+;;   3. fp with fpload/fpstore 
+;;
+;; Of course, there are various restrictions.
+;; Reference:
+;;   "Ruby (R20K) Technical Specification Rev. 1.2, December 28, 1999."
+;;
+;; .........................
+
+;; Use three automata to isolate long latency operations, reducing space.
+(define_automaton "r20kc_other, r20kc_fdiv, r20kc_idiv")
+
+;;
+;; Describe the resources.
+;;
+
+;; Global.
+(define_cpu_unit "r20kc_iss0, r20kc_iss1" "r20kc_other")
+
+;; Integer execution unit (pipeline A).
+(define_cpu_unit "r20kc_ixua_addsub_agen" "r20kc_other")
+(define_cpu_unit "r20kc_ixua_shift"	  "r20kc_other")
+
+(exclusion_set "r20kc_ixua_addsub_agen" "r20kc_ixua_shift")
+
+;; Integer execution unit (pipeline B).
+(define_cpu_unit "r20kc_ixub_addsub"	  "r20kc_other")
+(define_cpu_unit "r20kc_ixub_branch"	  "r20kc_other")
+(define_cpu_unit "r20kc_ixub_mpydiv"	  "r20kc_other")
+(define_cpu_unit "r20kc_ixub_mpydiv_iter" "r20kc_idiv")
+
+(exclusion_set "r20kc_ixub_addsub" "r20kc_ixub_branch, r20kc_ixub_mpydiv")
+(exclusion_set "r20kc_ixub_branch" "r20kc_ixub_mpydiv")
+
+;; Cache / memory interface.
+(define_cpu_unit "r20kc_cache"	    "r20kc_other")
+
+;; Floating-point unit.
+(define_cpu_unit "r20kc_fpu_add"	  "r20kc_other")
+(define_cpu_unit "r20kc_fpu_mpy"	  "r20kc_other")
+(define_cpu_unit "r20kc_fpu_mpy_iter"	  "r20kc_fdiv")
+(define_cpu_unit "r20kc_fpu_divsqrt"	  "r20kc_other")
+(define_cpu_unit "r20kc_fpu_divsqrt_iter" "r20kc_fdiv")
+
+(exclusion_set "r20kc_fpu_add" "r20kc_fpu_mpy, r20kc_fpu_divsqrt")
+(exclusion_set "r20kc_fpu_mpy" "r20kc_fpu_divsqrt")
+
+;; After branch any insn can not be issued.
+(absence_set "r20kc_iss0,r20kc_iss1" "r20kc_ixub_branch")
+
+;;
+;; Define reservations for unit name mnemonics or combinations.
+;;
+
+(define_reservation "r20kc_iss"
+  "r20kc_iss0|r20kc_iss1")
+(define_reservation "r20kc_single_dispatch"
+  "r20kc_iss0+r20kc_iss1")
+(define_reservation "r20kc_iaddsub"
+  "r20kc_iss+(r20kc_ixua_addsub_agen|r20kc_ixub_addsub)")
+(define_reservation "r20kc_ishift"
+  "r20kc_iss+r20kc_ixua_shift")
+(define_reservation "r20kc_fpmove"
+  "r20kc_iss+r20kc_ixua_addsub_agen")
+(define_reservation "r20kc_imem"
+  "r20kc_iss+r20kc_ixua_addsub_agen+r20kc_cache")
+(define_reservation "r20kc_icache"
+  "r20kc_cache")
+(define_reservation "r20kc_impydiv"
+  "r20kc_iss+r20kc_ixub_mpydiv")
+(define_reservation "r20kc_impydiv_iter"
+  "r20kc_ixub_mpydiv_iter")
+(define_reservation "r20kc_ibranch"
+  "r20kc_iss+r20kc_ixub_branch")
+
+(define_reservation "r20kc_fpadd"
+  "r20kc_iss+r20kc_fpu_add")
+(define_reservation "r20kc_fpmpy"
+  "r20kc_iss+r20kc_fpu_mpy")
+(define_reservation "r20kc_fpmpy_iter"
+  "r20kc_fpu_mpy_iter")
+(define_reservation "r20kc_fpdivsqrt"
+  "r20kc_iss+r20kc_fpu_divsqrt")
+(define_reservation "r20kc_fpdivsqrt_iter"
+  "r20kc_fpu_divsqrt_iter")
+
+;;
+;; Describe instruction reservations for integer operations.
+;;
+
+;; Conditional moves always force single-dispatch.
+(define_insn_reservation "r20kc_cond_move_int" 1 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "condmove")
+				   (eq_attr "mode" "!SF,DF")))
+			 "r20kc_single_dispatch")
+
+(define_insn_reservation "r20kc_cond_move_fp" 4 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "condmove")
+				   (eq_attr "mode" "SF,DF")))
+			 "r20kc_single_dispatch")
+
+(define_insn_reservation "r20kc_int_other" 1
+			  (and (eq_attr "cpu" "20kc")
+			       (eq_attr "type" "move,arith,const,nop"))
+			  "r20kc_iaddsub")
+
+;; Shifts can only execute on ixu pipeline A.
+(define_insn_reservation "r20kc_int_shift" 1
+			  (and (eq_attr "cpu" "20kc")
+			       (eq_attr "type" "shift"))
+			  "r20kc_ishift")
+
+(define_insn_reservation "r20kc_ld" 2 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "load,prefetch,prefetchx"))
+			 "r20kc_imem")
+
+
+;; A load immediately following a store will stall, so
+;; say that a store uses the cache for an extra cycle.
+(define_insn_reservation "r20kc_st" 2 
+			  (and (eq_attr "cpu" "20kc")
+			       (eq_attr "type" "store"))
+			  "r20kc_imem,r20kc_icache")
+
+(define_insn_reservation "r20kc_fld" 3 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "fpload"))
+			 "r20kc_imem")
+
+(define_insn_reservation "r20kc_ffst" 3 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "fpstore"))
+			 "r20kc_imem,r20kc_icache*2")
+
+;; Integer divide latency is between 13 and 42 cycles for DIV[U] and between
+;; 13 and 72 cycles for DDIV[U]. This depends on the value of the inputs
+;; so we just choose the worst case latency.
+(define_insn_reservation "r20kc_idiv_si" 42 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "idiv")
+				   (eq_attr "mode" "SI")))
+			 "r20kc_impydiv+(r20kc_impydiv_iter*42)")
+
+(define_insn_reservation "r20kc_idiv_di" 72 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "idiv")
+				   (eq_attr "mode" "DI")))
+			 "r20kc_impydiv+(r20kc_impydiv_iter*72)")
+
+;; Integer multiply latency is 4 or 7 cycles for word and double-word
+;; respectively.
+(define_insn_reservation "r20kc_impy_si" 4 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "imadd,imul,imul3")
+				   (eq_attr "mode" "SI")))
+			 "r20kc_impydiv+(r20kc_impydiv_iter*2)")
+
+(define_insn_reservation "r20kc_impy_di" 7 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "imadd,imul,imul3")
+				   (eq_attr "mode" "DI")))
+			 "r20kc_impydiv+(r20kc_impydiv_iter*7)")
+
+;; Move to/from HI/LO.
+;; Moving to HI/LO has a 3 cycle latency while moving from only has a 1
+;; cycle latency.  Repeat rate is 3 for both.
+(define_insn_reservation "r20kc_imthilo" 3 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "mthilo"))
+			 "r20kc_impydiv+(r20kc_impydiv_iter*3)")
+
+(define_insn_reservation "r20kc_imfhilo" 1
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "mfhilo"))
+			 "r20kc_impydiv+(r20kc_impydiv_iter*3)")
+
+;; Move to fp coprocessor.
+(define_insn_reservation "r20kc_ixfer_mt" 3 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "mtc"))
+			 "r20kc_fpmove")
+
+;; Move from fp coprocessor.
+(define_insn_reservation "r20kc_ixfer_mf" 2 
+			  (and (eq_attr "cpu" "20kc")
+			       (eq_attr "type" "mfc"))
+			"r20kc_fpmove")
+
+;; Assume branch predicted correctly.
+(define_insn_reservation "r20kc_ibr" 1 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "branch,jump,call"))
+			 "r20kc_ibranch")
+
+;;
+;; Describe instruction reservations for the floating-point operations.
+;;
+(define_insn_reservation "r20kc_fp_other" 4
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "fmove,fadd,fabs,fneg,fcmp"))
+			 "r20kc_fpadd")
+
+(define_insn_reservation "r20kc_fp_cvt_a" 4
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "fcvt")
+				   (eq_attr "cnv_mode" "I2S,I2D,S2D")))
+			 "r20kc_fpadd")
+
+(define_insn_reservation "r20kc_fp_cvt_b" 5
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "fcvt")
+				   (eq_attr "cnv_mode" "D2S,S2I")))
+			 "r20kc_fpadd")
+
+(define_insn_reservation "r20kc_fp_divsqrt_df" 32
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "fdiv,fsqrt")
+				   (eq_attr "mode" "DF")))
+			 "r20kc_fpdivsqrt+(r20kc_fpdivsqrt_iter*32)")
+
+(define_insn_reservation "r20kc_fp_divsqrt_sf" 17
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "fdiv,fsqrt")
+				   (eq_attr "mode" "SF")))
+			 "r20kc_fpdivsqrt+(r20kc_fpdivsqrt_iter*17)")
+
+(define_insn_reservation "r20kc_fp_rsqrt_df" 35 
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "frsqrt")
+				   (eq_attr "mode" "DF")))
+			 "r20kc_fpdivsqrt+(r20kc_fpdivsqrt_iter*35)")
+
+(define_insn_reservation "r20kc_fp_rsqrt_sf" 17
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "frsqrt")
+				   (eq_attr "mode" "SF")))
+			 "r20kc_fpdivsqrt+(r20kc_fpdivsqrt_iter*17)")
+
+(define_insn_reservation "r20kc_fp_mpy_sf" 4
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "fmul,fmadd")
+				   (eq_attr "mode" "SF")))
+			 "r20kc_fpmpy+r20kc_fpmpy_iter")
+
+(define_insn_reservation "r20kc_fp_mpy_df" 5
+			 (and (eq_attr "cpu" "20kc")
+			      (and (eq_attr "type" "fmul,fmadd")
+				   (eq_attr "mode" "DF")))
+			 "r20kc_fpmpy+(r20kc_fpmpy_iter*2)")
+
+;; Force single-dispatch for unknown or multi.
+(define_insn_reservation "r20kc_unknown" 1 
+			 (and (eq_attr "cpu" "20kc")
+			      (eq_attr "type" "unknown,multi"))
+			 "r20kc_single_dispatch")