re PR target/68535 (arm.c: 5 * set but not used)

2017-06-28  Michael Collison  <michael.collison@arm.com>

	PR target/68535
	* config/arm/arm.c (gen_ldm_seq): Remove last unnecessary
	set of base_reg
	(arm_gen_movmemqi): Removed unused variable 'i'.
	Convert 'for' loop into 'while' loop.
	(arm_expand_prologue): Remove last unnecessary set of insn.
	(thumb_pop): Remove unused variable 'pushed_words'.
	(thumb_exit): Remove last unnecessary set of regs_to_pop.

From-SVN: r249721

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 48c81b3..79c825e 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,14 @@
+2017-06-28  Michael Collison  <michael.collison@arm.com>
+
+       PR target/68535
+       * config/arm/arm.c (gen_ldm_seq): Remove last unnecessary
+       set of base_reg
+       (arm_gen_movmemqi): Removed unused variable 'i'.
+       Convert 'for' loop into 'while' loop.
+       (arm_expand_prologue): Remove last unnecessary set of insn.
+       (thumb_pop): Remove unused variable 'pushed_words'.
+       (thumb_exit): Remove last unnecessary set of regs_to_pop.
+
 2017-06-28  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
 
        * config/s390/predicates.md: Use s390_rel_address_ok_p.

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index f3b2715..c00bdd8 100644 (file)
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -13614,10 +13614,7 @@ gen_ldm_seq (rtx *operands, int nops, bool sort_regs)
       emit_insn (gen_addsi3 (newbase, base_reg_rtx, GEN_INT (offset)));
       offset = 0;
       if (!TARGET_THUMB1)
-       {
-         base_reg = regs[0];
-         base_reg_rtx = newbase;
-       }
+       base_reg_rtx = newbase;
     }
 
   for (i = 0; i < nops; i++)
@@ -14141,7 +14138,6 @@ arm_gen_movmemqi (rtx *operands)
 {
   HOST_WIDE_INT in_words_to_go, out_words_to_go, last_bytes;
   HOST_WIDE_INT srcoffset, dstoffset;
-  int i;
   rtx src, dst, srcbase, dstbase;
   rtx part_bytes_reg = NULL;
   rtx mem;
@@ -14171,7 +14167,7 @@ arm_gen_movmemqi (rtx *operands)
   if (out_words_to_go != in_words_to_go && ((in_words_to_go - 1) & 3) != 0)
     part_bytes_reg = gen_rtx_REG (SImode, (in_words_to_go - 1) & 3);
 
-  for (i = 0; in_words_to_go >= 2; i+=4)
+  while (in_words_to_go >= 2)
     {
       if (in_words_to_go > 4)
        emit_insn (arm_gen_load_multiple (arm_regs_in_sequence, 4, src,
@@ -21725,8 +21721,8 @@ arm_expand_prologue (void)
         will prevent the scheduler from moving stores to the frame
         before the stack adjustment.  */
       if (frame_pointer_needed)
-       insn = emit_insn (gen_stack_tie (stack_pointer_rtx,
-                                        hard_frame_pointer_rtx));
+       emit_insn (gen_stack_tie (stack_pointer_rtx,
+                                 hard_frame_pointer_rtx));
     }
 
 
@@ -23811,7 +23807,6 @@ thumb_pop (FILE *f, unsigned long mask)
 {
   int regno;
   int lo_mask = mask & 0xFF;
-  int pushed_words = 0;
 
   gcc_assert (mask);
 
@@ -23834,8 +23829,6 @@ thumb_pop (FILE *f, unsigned long mask)
 
          if ((lo_mask & ~1) != 0)
            fprintf (f, ", ");
-
-         pushed_words++;
        }
     }
 
@@ -24105,9 +24098,6 @@ thumb_exit (FILE *f, int reg_containing_return_addr)
       move_to     = number_of_first_bit_set (regs_to_pop);
 
       asm_fprintf (f, "\tmov\t%r, %r\n", move_to, popped_into);
-
-      regs_to_pop &= ~(1 << move_to);
-
       --pops_needed;
     }