Split X86_TUNE_AVX128_OPTIMAL into X86_TUNE_AVX256_SPLIT_REGS

and X86_TUNE_AVX128_OPTIMAL.

Changelog
gcc/
	PR target/92448
	* config/i386/i386-expand.c (ix86_expand_set_or_cpymem):
	Replace TARGET_AVX128_OPTIMAL with TARGET_AVX256_SPLIT_REGS.
	* config/i386/i386-option.c (ix86_vec_cost): Ditto.
	(ix86_reassociation_width): Ditto.
	* config/i386/i386-options.c (ix86_option_override_internal):
	Replace TARGET_AVX128_OPTIAML with
	ix86_tune_features[X86_TUNE_AVX128_OPTIMAL]
	* config/i386/i386.h (TARGET_AVX256_SPLIT_REGS): New macro.
	(TARGET_AVX128_OPTIMAL): Deleted.
	* config/i386/x86-tune.def (X86_TUNE_AVX256_SPLIT_REGS): New
	DEF_TUNE.

From-SVN: r278385

gcc/ChangeLog

+2019-11-18  Hongtao Liu  <hongtao.liu@intel.com>
+
+	PR target/92448
+	* config/i386/i386-expand.c (ix86_expand_set_or_cpymem):
+	Replace TARGET_AVX128_OPTIMAL with TARGET_AVX256_SPLIT_REGS.
+	* config/i386/i386-option.c (ix86_vec_cost): Ditto.
+	(ix86_reassociation_width): Ditto.
+	* config/i386/i386-options.c (ix86_option_override_internal):
+	Replace TARGET_AVX128_OPTIAML with
+	ix86_tune_features[X86_TUNE_AVX128_OPTIMAL]
+	* config/i386/i386.h (TARGET_AVX256_SPLIT_REGS): New macro.
+	(TARGET_AVX128_OPTIMAL): Deleted.
+	* config/i386/x86-tune.def (X86_TUNE_AVX256_SPLIT_REGS): New
+	DEF_TUNE.
+
 2019-11-16  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.md (cceq_ior_compare): Rename to...

gcc/config/i386/i386-expand.c

@@ -7347,7 +7347,7 @@ ix86_expand_set_or_cpymem (rtx dst, rtx src, rtx count_exp, rtx val_exp,
 	     && optab_handler (mov_optab, wider_mode) != CODE_FOR_nothing)
 	move_mode = wider_mode;
 
-      if (TARGET_AVX128_OPTIMAL && GET_MODE_BITSIZE (move_mode) > 128)
+      if (TARGET_AVX256_SPLIT_REGS && GET_MODE_BITSIZE (move_mode) > 128)
 	move_mode = TImode;
 
       /* Find the corresponding vector mode with the same size as MOVE_MODE.

gcc/config/i386/i386-options.c

@@ -2674,7 +2674,7 @@ ix86_option_override_internal (bool main_args_p,
 
   /* Enable 128-bit AVX instruction generation
      for the auto-vectorizer.  */
-  if (TARGET_AVX128_OPTIMAL
+  if (ix86_tune_features[X86_TUNE_AVX128_OPTIMAL]
       && (opts_set->x_prefer_vector_width_type == PVW_NONE))
     opts->x_prefer_vector_width_type = PVW_AVX128;
 

gcc/config/i386/i386.c

@@ -18959,7 +18959,7 @@ ix86_vec_cost (machine_mode mode, int cost)
       && TARGET_SSE_SPLIT_REGS)
     return cost * 2;
   if (GET_MODE_BITSIZE (mode) > 128
-      && TARGET_AVX128_OPTIMAL)
+      && TARGET_AVX256_SPLIT_REGS)
     return cost * GET_MODE_BITSIZE (mode) / 128;
   return cost;
 }
@@ -21297,7 +21297,7 @@ ix86_reassociation_width (unsigned int op, machine_mode mode)
 	return 1;
 
       /* Account for targets that splits wide vectors into multiple parts.  */
-      if (TARGET_AVX128_OPTIMAL && GET_MODE_BITSIZE (mode) > 128)
+      if (TARGET_AVX256_SPLIT_REGS && GET_MODE_BITSIZE (mode) > 128)
 	div = GET_MODE_BITSIZE (mode) / 128;
       else if (TARGET_SSE_SPLIT_REGS && GET_MODE_BITSIZE (mode) > 64)
 	div = GET_MODE_BITSIZE (mode) / 64;

gcc/config/i386/i386.h

@@ -578,8 +578,8 @@ extern unsigned char ix86_tune_features[X86_TUNE_LAST];
 	ix86_tune_features[X86_TUNE_AVOID_LEA_FOR_ADDR]
 #define TARGET_SOFTWARE_PREFETCHING_BENEFICIAL \
 	ix86_tune_features[X86_TUNE_SOFTWARE_PREFETCHING_BENEFICIAL]
-#define TARGET_AVX128_OPTIMAL \
-	ix86_tune_features[X86_TUNE_AVX128_OPTIMAL]
+#define TARGET_AVX256_SPLIT_REGS \
+	ix86_tune_features[X86_TUNE_AVX256_SPLIT_REGS]
 #define TARGET_GENERAL_REGS_SSE_SPILL \
 	ix86_tune_features[X86_TUNE_GENERAL_REGS_SSE_SPILL]
 #define TARGET_AVOID_MEM_OPND_FOR_CMOVE \

gcc/config/i386/x86-tune.def

@@ -453,6 +453,10 @@ DEF_TUNE (X86_TUNE_AVX256_UNALIGNED_LOAD_OPTIMAL, "256_unaligned_load_optimal",
 DEF_TUNE (X86_TUNE_AVX256_UNALIGNED_STORE_OPTIMAL, "256_unaligned_store_optimal",
 	  ~(m_NEHALEM | m_SANDYBRIDGE | m_BDVER | m_ZNVER1 | m_GENERIC))
 
+/* X86_TUNE_AVX256_SPLIT_REGS: if true, AVX256 ops are split into two AVX128 ops.  */
+DEF_TUNE (X86_TUNE_AVX256_SPLIT_REGS, "avx256_split_regs",m_BDVER | m_BTVER2
+	  | m_ZNVER1)
+
 /* X86_TUNE_AVX128_OPTIMAL: Enable 128-bit AVX instruction generation for
    the auto-vectorizer.  */
 DEF_TUNE (X86_TUNE_AVX128_OPTIMAL, "avx128_optimal", m_BDVER | m_BTVER2