[PATCH 6/7] x86: drop REGNAM_{AL,AX,EAX}

[Jan Beulich]

The former two are unused anyway. And having such constants isn't very
helpful either, when they live in a place where updating the register
table wouldn't even allow noticing the need to adjust these constants.

gas/
2021-03-XX  Jan Beulich  <jbeulich@suse.com>

	* config/tc-i386.c (reg_eax): New.
	(md_begin): Initialize reg_eax.
	* config/tc-i386-intel.c (i386_intel_simplify_register): Use
	reg_eax.
	(i386_intel_simplify): Likewise.

opcodes/
2021-03-XX  Jan Beulich  <jbeulich@suse.com>

	* i386-opc.h (REGNAM_AL, REGNAM_AX, REGNAM_EAX): Delete.

--- a/gas/config/tc-i386-intel.c
+++ b/gas/config/tc-i386-intel.c
@@ -335,7 +335,7 @@ i386_intel_simplify_register (expression
   else
     {
       /* esp is invalid as index */
-      intel_state.index = i386_regtab + REGNAM_EAX + ESP_REG_NUM;
+      intel_state.index = reg_eax + ESP_REG_NUM;
     }
   return 2;
 }
@@ -500,7 +500,7 @@ static int i386_intel_simplify (expressi
 		break;
 	      default:
 		/* esp is invalid as index */
-		intel_state.index = i386_regtab + REGNAM_EAX + ESP_REG_NUM;
+		intel_state.index = reg_eax + ESP_REG_NUM;
 		break;
 	      }
 
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -214,6 +214,7 @@ static const char *default_arch = DEFAUL
 static const reg_entry bad_reg = { "<bad>", OPERAND_TYPE_NONE, 0, 0,
 				   { Dw2Inval, Dw2Inval } };
 
+static const reg_entry *reg_eax;
 static const reg_entry *reg_st0;
 static const reg_entry *reg_k0;
 
@@ -3091,7 +3092,12 @@ md_begin (void)
 	switch (regtab->reg_type.bitfield.class)
 	  {
 	  case Reg:
-	    if (regtab->reg_type.bitfield.tbyte)
+	    if (regtab->reg_type.bitfield.dword)
+	      {
+		if (regtab->reg_type.bitfield.instance == Accum)
+		  reg_eax = regtab;
+	      }
+	    else if (regtab->reg_type.bitfield.tbyte)
 	      {
 		/* There's no point inserting st(<N>) in the hash table, as
 		   parentheses aren't included in register_chars[] anyway.  */
--- a/opcodes/i386-opc.h
+++ b/opcodes/i386-opc.h
@@ -990,11 +990,6 @@ typedef struct
 }
 reg_entry;
 
-/* Entries in i386_regtab.  */
-#define REGNAM_AL 0
-#define REGNAM_AX 24
-#define REGNAM_EAX 40
-
 extern const reg_entry i386_regtab[];
 extern const unsigned int i386_regtab_size;