File loop-unroll-adjust of Package libffi43

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File loop-unroll-adjust of Package libffi43

Index: gcc/config/s390/s390.c
===================================================================
*** gcc/config/s390/s390.c.orig
--- gcc/config/s390/s390.c
*************** along with GCC; see the file COPYING3.
*** 53,58 ****
--- 53,59 ----
  #include "tree-gimple.h"
  #include "df.h"
  #include "params.h"
+ #include "cfgloop.h"
  
  
  /* Define the specific costs for a given cpu.  */
*************** s390_reorg (void)
*** 10030,10035 ****
--- 10031,10092 ----
  }
  
  
+ /* This function checks the whole of insn X for memory references. The
+    function always returns zero because the framework it is called
+    from would stop recursively analyzing the insn upon a return value
+    other than zero. The real result of this function is updating
+    counter variable MEM_COUNT.  */
+ static int
+ check_dpu (rtx *x, unsigned *mem_count)
+ {
+   if (*x != NULL_RTX && MEM_P (*x))
+     (*mem_count)++;
+   return 0;
+ }
+ 
+ /* This target hook implementation for TARGET_LOOP_UNROLL_ADJUST calculates
+    a new number struct loop *loop should be unrolled if tuned for the z10
+    cpu. The loop is analyzed for memory accesses by calling check_dpu for
+    each rtx of the loop. Depending on the loop_depth and the amount of
+    memory accesses a new number <=nunroll is returned to improve the
+    behaviour of the hardware prefetch unit.  */
+ static unsigned
+ s390_loop_unroll_adjust (unsigned nunroll, struct loop *loop)
+ {
+   basic_block *bbs;
+   rtx insn;
+   unsigned i;
+   unsigned mem_count = 0;
+ 
+   /* Only z10 needs special handling.  */
+   if (s390_tune != PROCESSOR_2097_Z10)
+     return nunroll;
+ 
+   /* Count the number of memory references within the loop body.  */
+   bbs = get_loop_body (loop);
+   for (i = 0; i < loop->num_nodes; i++)
+     {
+       for (insn = BB_HEAD (bbs[i]); insn != BB_END (bbs[i]); insn = NEXT_INSN (insn))
+ 	if (INSN_P (insn) && INSN_CODE (insn) != -1)
+             for_each_rtx (&insn, (rtx_function) check_dpu, &mem_count);
+     }
+   free (bbs);
+ 
+   /* Prevent division by zero, and we do not need to adjust nunroll in this case.  */
+   if (mem_count == 0)
+     return nunroll;
+ 
+   switch (loop_depth(loop))
+     {
+     case 1:
+       return MIN (nunroll, 28 / mem_count);
+     case 2:
+       return MIN (nunroll, 22 / mem_count);
+     default:
+       return MIN (nunroll, 16 / mem_count);
+     }
+ }
+ 
  /* Initialize GCC target structure.  */
  
  #undef  TARGET_ASM_ALIGNED_HI_OP
*************** s390_reorg (void)
*** 10144,10149 ****
--- 10201,10209 ----
  #undef TARGET_LIBGCC_SHIFT_COUNT_MODE
  #define TARGET_LIBGCC_SHIFT_COUNT_MODE s390_libgcc_shift_count_mode
  
+ #undef TARGET_LOOP_UNROLL_ADJUST
+ #define TARGET_LOOP_UNROLL_ADJUST s390_loop_unroll_adjust
+ 
  struct gcc_target targetm = TARGET_INITIALIZER;
  
  #include "gt-s390.h"
Index: gcc/doc/tm.texi
===================================================================
*** gcc/doc/tm.texi.orig
--- gcc/doc/tm.texi
*************** to have to make special provisions in @c
*** 10296,10301 ****
--- 10296,10310 ----
  to reserve space for caller-saved target registers.
  @end deftypefn
  
+ @deftypefn {Target Hook} unsigned TARGET_LOOP_UNROLL_ADJUST (unsigned @var{nunroll}, struct loop *@var{loop})
+ This target hook returns a new value for the number of times @var{loop}
+ should be unrolled. The parameter @var{nunroll} is the number of times
+ the loop is to be unrolled. The parameter @var{loop} is a pointer to
+ the loop, which is going to be checked for unrolling. This target hook
+ is required only when the target has special constraints like maximum
+ number of memory accesses.
+ @end deftypefn
+ 
  @defmac POWI_MAX_MULTS
  If defined, this macro is interpreted as a signed integer C expression
  that specifies the maximum number of floating point multiplications
Index: gcc/loop-unroll.c
===================================================================
*** gcc/loop-unroll.c.orig
--- gcc/loop-unroll.c
*************** along with GCC; see the file COPYING3.
*** 32,37 ****
--- 32,38 ----
  #include "expr.h"
  #include "hashtab.h"
  #include "recog.h"    
+ #include "target.h"
  
  /* This pass performs loop unrolling and peeling.  We only perform these
     optimizations on innermost loops (with single exception) because
*************** decide_unroll_runtime_iterations (struct
*** 818,823 ****
--- 819,827 ----
    if (nunroll > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLL_TIMES))
      nunroll = PARAM_VALUE (PARAM_MAX_UNROLL_TIMES);
  
+   if (targetm.loop_unroll_adjust)
+     nunroll = targetm.loop_unroll_adjust (nunroll, loop);
+ 
    /* Skip big loops.  */
    if (nunroll <= 1)
      {
*************** decide_unroll_stupid (struct loop *loop,
*** 1358,1363 ****
--- 1362,1370 ----
    if (nunroll > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLL_TIMES))
      nunroll = PARAM_VALUE (PARAM_MAX_UNROLL_TIMES);
  
+   if (targetm.loop_unroll_adjust)
+     nunroll = targetm.loop_unroll_adjust (nunroll, loop);
+ 
    /* Skip big loops.  */
    if (nunroll <= 1)
      {
Index: gcc/target-def.h
===================================================================
*** gcc/target-def.h.orig
--- gcc/target-def.h
***************
*** 464,469 ****
--- 464,470 ----
  #define TARGET_CANNOT_MODIFY_JUMPS_P hook_bool_void_false
  #define TARGET_BRANCH_TARGET_REGISTER_CLASS hook_int_void_no_regs
  #define TARGET_BRANCH_TARGET_REGISTER_CALLEE_SAVED hook_bool_bool_false
+ #define TARGET_LOOP_UNROLL_ADJUST NULL
  #define TARGET_CANNOT_FORCE_CONST_MEM hook_bool_rtx_false
  #define TARGET_CANNOT_COPY_INSN_P NULL
  #define TARGET_COMMUTATIVE_P hook_bool_const_rtx_commutative_p
***************
*** 734,739 ****
--- 735,741 ----
    TARGET_CANNOT_MODIFY_JUMPS_P,			\
    TARGET_BRANCH_TARGET_REGISTER_CLASS,		\
    TARGET_BRANCH_TARGET_REGISTER_CALLEE_SAVED,	\
+   TARGET_LOOP_UNROLL_ADJUST,			\
    TARGET_CANNOT_FORCE_CONST_MEM,		\
    TARGET_CANNOT_COPY_INSN_P,			\
    TARGET_COMMUTATIVE_P,				\
Index: gcc/target.h
===================================================================
*** gcc/target.h.orig
--- gcc/target.h
*************** struct _dep;
*** 91,96 ****
--- 91,99 ----
  /* This is defined in ddg.h .  */
  struct ddg;
  
+ /* This is defined in cfgloop.h .  */
+ struct loop;
+ 
  struct gcc_target
  {
    /* Functions that output assembler for the target.  */
*************** struct gcc_target
*** 560,565 ****
--- 563,571 ----
       already been generated.  */
    bool (* branch_target_register_callee_saved) (bool after_pe_gen);
  
+   /* Return a new value for loop unroll size.  */
+   unsigned (* loop_unroll_adjust) (unsigned nunroll, struct loop *loop);
+ 
    /* True if the constant X cannot be placed in the constant pool.  */
    bool (* cannot_force_const_mem) (rtx);

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