Remove redundant fixed_regs tests

This patch removes redundant fixed_regs tests in things like:

  !fixed_regs[i] && !call_used_or_fixed_reg_p (i)

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/alpha/alpha.c (alpha_compute_frame_layout): Remove redundant
	fixed_regs test.
	* config/bpf/bpf.c (bpf_compute_frame_layout, bpf_expand_prologue)
	(bpf_expand_epilogue): Likewise.
	* config/c6x/c6x.c (c6x_save_reg): Likewise.
	* config/ft32/ft32.c (ft32_expand_prologue): Likewise.
	(ft32_expand_epilogue): Likewise.
	* config/i386/i386.c (ix86_save_reg): Likewise.
	* config/moxie/moxie.c (moxie_expand_prologue): Likewise.
	(moxie_expand_epilogue): Likewise.
	* config/tilegx/tilegx.c (need_to_save_reg): Likewise.
	* config/tilepro/tilepro.c (need_to_save_reg): Likewise.
	* config/xtensa/xtensa.c (xtensa_call_save_reg): Likewise.

From-SVN: r275603

10 files changed, 29 insertions, 20 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 099652b..86aa676 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,21 @@
 2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* config/alpha/alpha.c (alpha_compute_frame_layout): Remove redundant
+	fixed_regs test.
+	* config/bpf/bpf.c (bpf_compute_frame_layout, bpf_expand_prologue)
+	(bpf_expand_epilogue): Likewise.
+	* config/c6x/c6x.c (c6x_save_reg): Likewise.
+	* config/ft32/ft32.c (ft32_expand_prologue): Likewise.
+	(ft32_expand_epilogue): Likewise.
+	* config/i386/i386.c (ix86_save_reg): Likewise.
+	* config/moxie/moxie.c (moxie_expand_prologue): Likewise.
+	(moxie_expand_epilogue): Likewise.
+	* config/tilegx/tilegx.c (need_to_save_reg): Likewise.
+	* config/tilepro/tilepro.c (need_to_save_reg): Likewise.
+	* config/xtensa/xtensa.c (xtensa_call_save_reg): Likewise.
+
+2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* hard-reg-set.h (call_used_or_fixed_reg_p): New macro.
 	* cfgloopanal.c (init_set_costs): Use call_used_or_fixed_reg_p
 	instead of testing call_used_regs directly.
diff --git a/gcc/config/alpha/alpha.c b/gcc/config/alpha/alpha.c
index 5c07b95..f01305b 100644
--- a/gcc/config/alpha/alpha.c
+++ b/gcc/config/alpha/alpha.c
@@ -7225,7 +7225,7 @@ alpha_compute_frame_layout (void)
 
       /* One for every register we have to save.  */
       for (unsigned i = 0; i < FIRST_PSEUDO_REGISTER; i++)
-	if (! fixed_regs[i] && ! call_used_or_fixed_reg_p (i)
+	if (! call_used_or_fixed_reg_p (i)
 	    && df_regs_ever_live_p (i) && i != REG_RA)
 	  sa_mask |= HOST_WIDE_INT_1U << i;
 
diff --git a/gcc/config/bpf/bpf.c b/gcc/config/bpf/bpf.c
index 6e57b00..0fe80ce 100644
--- a/gcc/config/bpf/bpf.c
+++ b/gcc/config/bpf/bpf.c
@@ -271,8 +271,7 @@ bpf_compute_frame_layout (void)
      the current function.  There is no need to round up, since the
      registers are all 8 bytes wide.  */
   for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
-    if ((!fixed_regs[regno]
-	 && df_regs_ever_live_p (regno)
+    if ((df_regs_ever_live_p (regno)
 	 && !call_used_or_fixed_reg_p (regno))
 	|| (cfun->calls_alloca
 	    && regno == STACK_POINTER_REGNUM))
@@ -312,8 +311,7 @@ bpf_expand_prologue (void)
      right after the local variables.  */
   for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
     {
-      if ((!fixed_regs[regno]
-	   && df_regs_ever_live_p (regno)
+      if ((df_regs_ever_live_p (regno)
 	   && !call_used_or_fixed_reg_p (regno))
 	  || (cfun->calls_alloca
 	      && regno == STACK_POINTER_REGNUM))
@@ -372,8 +370,7 @@ bpf_expand_epilogue (void)
   /* Restore callee-saved hard registes from the stack.  */
   for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
     {
-      if ((!fixed_regs[regno]
-	   && df_regs_ever_live_p (regno)
+      if ((df_regs_ever_live_p (regno)
 	   && !call_used_or_fixed_reg_p (regno))
 	  || (cfun->calls_alloca
 	      && regno == STACK_POINTER_REGNUM))
diff --git a/gcc/config/c6x/c6x.c b/gcc/config/c6x/c6x.c
index 7d1c2f7..e593273 100644
--- a/gcc/config/c6x/c6x.c
+++ b/gcc/config/c6x/c6x.c
@@ -2532,8 +2532,7 @@ static int
 c6x_save_reg (unsigned int regno)
 {
   return ((df_regs_ever_live_p (regno)
-	   && !call_used_or_fixed_reg_p (regno)
-	   && !fixed_regs[regno])
+	   && !call_used_or_fixed_reg_p (regno))
 	  || (regno == RETURN_ADDR_REGNO
 	      && (df_regs_ever_live_p (regno)
 		  || !crtl->is_leaf))
diff --git a/gcc/config/ft32/ft32.c b/gcc/config/ft32/ft32.c
index 3361df1..840882f 100644
--- a/gcc/config/ft32/ft32.c
+++ b/gcc/config/ft32/ft32.c
@@ -475,7 +475,7 @@ ft32_expand_prologue (void)
     {
       for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0;)
 	{
-	  if (!fixed_regs[regno] && !call_used_or_fixed_reg_p (regno)
+	  if (!call_used_or_fixed_reg_p (regno)
 	      && df_regs_ever_live_p (regno))
 	    {
 	      rtx preg = gen_rtx_REG (Pmode, regno);
@@ -488,7 +488,7 @@ ft32_expand_prologue (void)
     {
       for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
 	{
-	  if (!fixed_regs[regno] && df_regs_ever_live_p (regno)
+	  if (df_regs_ever_live_p (regno)
 	      && !call_used_or_fixed_reg_p (regno))
 	    {
 	      insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, regno)));
@@ -554,7 +554,7 @@ ft32_expand_epilogue (void)
     {
       for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0;)
         {
-          if (!fixed_regs[regno] && !call_used_or_fixed_reg_p (regno)
+          if (!call_used_or_fixed_reg_p (regno)
               && df_regs_ever_live_p (regno))
             {
               rtx preg = gen_rtx_REG (Pmode, regno);
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 7525b9d..9a87413 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -5666,7 +5666,6 @@ ix86_save_reg (unsigned int regno, bool maybe_eh_return, bool ignore_outlined)
 
   return (df_regs_ever_live_p (regno)
 	  && !call_used_or_fixed_reg_p (regno)
-	  && !fixed_regs[regno]
 	  && (regno != HARD_FRAME_POINTER_REGNUM || !frame_pointer_needed));
 }
 
diff --git a/gcc/config/moxie/moxie.c b/gcc/config/moxie/moxie.c
index aa5948e..fa4ed3f 100644
--- a/gcc/config/moxie/moxie.c
+++ b/gcc/config/moxie/moxie.c
@@ -288,8 +288,7 @@ moxie_expand_prologue (void)
   /* Save callee-saved registers.  */
   for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
     {
-      if (!fixed_regs[regno]
-	  && df_regs_ever_live_p (regno)
+      if (df_regs_ever_live_p (regno)
 	  && !call_used_or_fixed_reg_p (regno))
 	{
 	  insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, regno)));
@@ -351,7 +350,7 @@ moxie_expand_epilogue (void)
 	  emit_insn (gen_addsi3 (reg, reg, hard_frame_pointer_rtx));
 	}
       for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0; )
-	if (!fixed_regs[regno] && !call_used_or_fixed_reg_p (regno)
+	if (!call_used_or_fixed_reg_p (regno)
 	    && df_regs_ever_live_p (regno))
 	  {
 	    rtx preg = gen_rtx_REG (Pmode, regno);
diff --git a/gcc/config/tilegx/tilegx.c b/gcc/config/tilegx/tilegx.c
index 66a0ba5..f2ea9bb 100644
--- a/gcc/config/tilegx/tilegx.c
+++ b/gcc/config/tilegx/tilegx.c
@@ -3660,7 +3660,7 @@ tilegx_builtin_decl (unsigned code, bool initialize_p ATTRIBUTE_UNUSED)
 static bool
 need_to_save_reg (unsigned int regno)
 {
-  if (!fixed_regs[regno] && !call_used_or_fixed_reg_p (regno)
+  if (!call_used_or_fixed_reg_p (regno)
       && df_regs_ever_live_p (regno))
     return true;
 
diff --git a/gcc/config/tilepro/tilepro.c b/gcc/config/tilepro/tilepro.c
index ff01428..a1d59b1 100644
--- a/gcc/config/tilepro/tilepro.c
+++ b/gcc/config/tilepro/tilepro.c
@@ -3202,7 +3202,7 @@ tilepro_builtin_decl (unsigned code, bool initialize_p ATTRIBUTE_UNUSED)
 static bool
 need_to_save_reg (unsigned int regno)
 {
-  if (!fixed_regs[regno] && !call_used_or_fixed_reg_p (regno)
+  if (!call_used_or_fixed_reg_p (regno)
       && df_regs_ever_live_p (regno))
     return true;
 
diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
index 822c215..3c129fd 100644
--- a/gcc/config/xtensa/xtensa.c
+++ b/gcc/config/xtensa/xtensa.c
@@ -2686,8 +2686,7 @@ xtensa_call_save_reg(int regno)
   if (crtl->calls_eh_return && regno >= 2 && regno < 4)
     return true;
 
-  return !fixed_regs[regno] && !call_used_or_fixed_reg_p (regno) &&
-    df_regs_ever_live_p (regno);
+  return !call_used_or_fixed_reg_p (regno) && df_regs_ever_live_p (regno);
 }
 
 /* Return the bytes needed to compute the frame pointer from the current