[PATCH][ARM][cleanup] Simplify some expressions in some epilogue-related functions

[Kyrill Tkachov]

Hi all,

This is another cleanup patch that simplifies some expressions of the 
form (<expr> ? true : false) or if (boolean == true) and other minor 
cleanups.

Tested arm-none-eabi.

Ok for trunk? Or should this wait for the next stage?

Thanks,
Kyrill

2015-01-29  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

    * config/arm/arm.c (arm_emit_multi_reg_pop): Simplify definition of
    return_in_pc.  Remove redunant assignments.
    (thumb2_emit_ldrd_pop): Simplify definition of return_in_pc.
    (arm_expand_epilogue): Don't compare boolean with true in if condition.commit 568374491b4497bd8b122cb31db8ecf2bd8cb43b
Author: Kyrylo Tkachov <kyrylo.tkac...@arm.com>
Date:   Fri Nov 28 16:41:02 2014 +0000

    [ARM] Clean up multi-ref pop and epilogue functions

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index c9701b7..246298a 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -20273,11 +20273,10 @@ arm_emit_multi_reg_pop (unsigned long saved_regs_mask)
   rtx par;
   rtx dwarf = NULL_RTX;
   rtx tmp, reg;
-  bool return_in_pc;
+  bool return_in_pc = saved_regs_mask & (1 << PC_REGNUM);
   int offset_adj;
   int emit_update;
 
-  return_in_pc = (saved_regs_mask & (1 << PC_REGNUM)) ? true : false;
   offset_adj = return_in_pc ? 1 : 0;
   for (i = 0; i <= LAST_ARM_REGNUM; i++)
     if (saved_regs_mask & (1 << i))
@@ -20293,10 +20292,7 @@ arm_emit_multi_reg_pop (unsigned long saved_regs_mask)
   par = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (num_regs + emit_update + offset_adj));
 
   if (return_in_pc)
-    {
-      tmp = ret_rtx;
-      XVECEXP (par, 0, 0) = tmp;
-    }
+    XVECEXP (par, 0, 0) = ret_rtx;
 
   if (emit_update)
     {
@@ -20446,9 +20442,8 @@ thumb2_emit_ldrd_pop (unsigned long saved_regs_mask)
   rtx par = NULL_RTX;
   rtx dwarf = NULL_RTX;
   rtx tmp, reg, tmp1;
-  bool return_in_pc;
+  bool return_in_pc = saved_regs_mask & (1 << PC_REGNUM);
 
-  return_in_pc = (saved_regs_mask & (1 << PC_REGNUM)) ? true : false;
   for (i = 0; i <= LAST_ARM_REGNUM; i++)
     if (saved_regs_mask & (1 << i))
       num_regs++;
@@ -25230,7 +25225,7 @@ arm_expand_epilogue (bool really_return)
             arm_emit_multi_reg_pop (saved_regs_mask);
         }
 
-      if (return_in_pc == true)
+      if (return_in_pc)
         return;
     }