x86: also disallow non-byte/-word registers with byte/word suffix

Along the lines of be4c5e58bd ("x86: Always disallow double word suffix
with word general register") also adjust check_{byte,word}_reg(), to make
overall behavior consistent again in this regard.

gas/ChangeLog

@@ -1,3 +1,18 @@
+2020-02-12  Jan Beulich  <jbeulich@suse.com>
+
+	PR gas/25438
+	* config/tc-i386.c (REGISTER_WARNINGS): Delete.
+	(check_byte_reg): Skip only source operand of CRC32. Drop Non-
+	64-bit-only warning.
+	(check_word_reg): Consistently error on mismatching register
+	size and suffix.
+	* testsuite/gas/i386/general.s: Replace dword GPR with word one
+	for movw. Replace suffix / GPR for orb.
+	* testsuite/gas/i386/inval.s: Add tests for movw with dword and
+	byte GPRs as well as ones for inb/outb with a word accumulator.
+	* testsuite/gas/i386/general.l, testsuite/gas/i386/intelbad.l,
+	testsuite/gas/i386/inval.l: Adjust expectations.
+
 2020-02-12  Jan Beulich  <jbeulich@suse.com>
 
 	* config/tc-i386.c (operand_type_register_match): Also fall

gas/config/tc-i386.c

@@ -44,10 +44,6 @@
 #endif
 #endif
 
-#ifndef REGISTER_WARNINGS
-#define REGISTER_WARNINGS 1
-#endif
-
 #ifndef INFER_ADDR_PREFIX
 #define INFER_ADDR_PREFIX 1
 #endif
@@ -6638,31 +6634,10 @@ check_byte_reg (void)
 	  && i.tm.operand_types[op].bitfield.word)
 	continue;
 
-      /* crc32 doesn't generate this warning.  */
+      /* crc32 only wants its source operand checked here.  */
-      if (i.tm.base_opcode == 0xf20f38f0)
+      if (i.tm.base_opcode == 0xf20f38f0 && op)
 	continue;
 
-      if ((i.types[op].bitfield.word
-	   || i.types[op].bitfield.dword
-	   || i.types[op].bitfield.qword)
-	  && i.op[op].regs->reg_num < 4
-	  /* Prohibit these changes in 64bit mode, since the lowering
-	     would be more complicated.  */
-	  && flag_code != CODE_64BIT)
-	{
-#if REGISTER_WARNINGS
-	  if (!quiet_warnings)
-	    as_warn (_("using `%s%s' instead of `%s%s' due to `%c' suffix"),
-		     register_prefix,
-		     (i.op[op].regs + (i.types[op].bitfield.word
-				       ? REGNAM_AL - REGNAM_AX
-				       : REGNAM_AL - REGNAM_EAX))->reg_name,
-		     register_prefix,
-		     i.op[op].regs->reg_name,
-		     i.suffix);
-#endif
-	  continue;
-	}
       /* Any other register is bad.  */
       if (i.types[op].bitfield.class == Reg
 	  || i.types[op].bitfield.class == RegMMX
@@ -6818,30 +6793,18 @@ check_word_reg (void)
 		i.suffix);
 	return 0;
       }
-    /* Warn if the e or r prefix on a general reg is present.  */
+    /* Error if the e or r prefix on a general reg is present.  */
-    else if ((!quiet_warnings || flag_code == CODE_64BIT)
+    else if ((i.types[op].bitfield.dword
-	     && (i.types[op].bitfield.dword
 		 || i.types[op].bitfield.qword)
 	     && (i.tm.operand_types[op].bitfield.class == Reg
 		 || i.tm.operand_types[op].bitfield.instance == Accum)
 	     && i.tm.operand_types[op].bitfield.word)
-      {
-	/* Prohibit these changes in the 64bit mode, since the
-	   lowering is more complicated.  */
-	if (flag_code == CODE_64BIT)
       {
 	as_bad (_("incorrect register `%s%s' used with `%c' suffix"),
 		register_prefix, i.op[op].regs->reg_name,
 		i.suffix);
 	return 0;
       }
-#if REGISTER_WARNINGS
-	as_warn (_("using `%s%s' instead of `%s%s' due to `%c' suffix"),
-		 register_prefix,
-		 (i.op[op].regs + REGNAM_AX - REGNAM_EAX)->reg_name,
-		 register_prefix, i.op[op].regs->reg_name, i.suffix);
-#endif
-      }
   return 1;
 }
 

gas/testsuite/gas/i386/general.l

@@ -9,12 +9,6 @@
 .*:25: Warning:.*
 .*:27: Warning:.*
 .*:29: Warning:.*
-.*:48: Warning:.*
-.*:51: Warning:.*
-.*:124: Warning:.*
-.*:125: Warning:.*
-.*:126: Warning:.*
-.*:127: Warning:.*
 .*:128: Warning:.*
 .*:129: Warning:.*
 .*:130: Warning:.*
@@ -90,12 +84,10 @@
   45 008d 661F              		popw	%ds
   46 008f 668CD8            		mov	%ds,%ax
   47 0092 668CD8            		movw	%ds,%ax
-  48 0095 668CD8            		movw	%ds,%eax
+  48 0095 668CDF            		movw	%ds,%di
-.*Warning:.*
   49 0098 8ED8              		mov	%ax,%ds
   50 009a 8ED8              		movw	%ax,%ds
-  51 009c 8ED8              		movw	%eax,%ds
+  51 009c 8EDF              		movw	%di,%ds
-.*Warning:.*
   52                       	
   53                       	# test various pushes
   54 009e 6A0A              		pushl	\$10
@@ -167,15 +159,11 @@
  120 012e 0F9303            		setaeb	\(%ebx\)
  121 0131 0F93C0            		setae	%al
  122                       	
- 123                       	#these should give warnings
+ 123 0134 0C01              		orb	\$1,%al
- 124 0134 0C01              		orb	\$1,%ax
+ 124 0136 0D000100 00       		orl	\$0x100,%eax
-.*Warning:.*
+ 125 013b 80CB01            		orb	\$1,%bl
- 125 0136 0C01              		orb	\$1,%eax
+ 126                       	
-.*Warning:.*
+ 127                       	#these should give warnings
- 126 0138 80CB01            		orb	\$1,%bx
-.*Warning:.*
- 127 013b 80CB01            		orb	\$1,%ebx
-.*Warning:.*
  128 013e D9C1              		fldl	%st\(1\)
 .*Warning:.*
  129 0140 DDD2              		fstl	%st\(2\)

gas/testsuite/gas/i386/general.s

@@ -45,10 +45,10 @@
 	popw	%ds
 	mov	%ds,%ax
 	movw	%ds,%ax
-	movw	%ds,%eax
+	movw	%ds,%di
 	mov	%ax,%ds
 	movw	%ax,%ds
-	movw	%eax,%ds
+	movw	%di,%ds
 
 # test various pushes
 	pushl	$10
@@ -120,11 +120,11 @@
 	setaeb	(%ebx)
 	setae	%al
 
+	orb	$1,%al
+	orl	$0x100,%eax
+	orb	$1,%bl
+
 #these should give warnings
-	orb	$1,%ax
-	orb	$1,%eax
-	orb	$1,%bx
-	orb	$1,%ebx
 	fldl	%st(1)
 	fstl	%st(2)
 	fstpl	%st(3)

gas/testsuite/gas/i386/intelbad.l

@@ -154,7 +154,7 @@
 .*:172: Error: .*
 .*:174: Error: .*
 .*:175: Error: .*
-.*:176: Warning: .*
+.*:176: Error: .*
 .*:177: Error: .*
 .*:178: Error: .*
 .*:180: Error: .*

gas/testsuite/gas/i386/inval.l

@@ -91,6 +91,12 @@
 .*:104: Error: .*
 .*:105: Error: .*
 .*:106: Error: .*
+.*:108: Error: .*
+.*:109: Error: .*
+.*:110: Error: .*
+.*:112: Error: .*
+.*:113: Error: .*
+.*:114: Error: .*
 GAS LISTING .*
 
 
@@ -203,3 +209,14 @@ GAS LISTING .*
 [ 	]*[1-9][0-9]*[ 	]+movl	%ds, %ax
 [ 	]*[1-9][0-9]*[ 	]+movl	%ax, %ds
 [ 	]*[1-9][0-9]*[ 	]+movl	%ax, %bx
+[ 	]*[1-9][0-9]*[ 	]+
+[ 	]*[1-9][0-9]*[ 	]+movw	%ds, %eax
+[ 	]*[1-9][0-9]*[ 	]+movw	%eax, %ds
+[ 	]*[1-9][0-9]*[ 	]+movw	%eax, %ebx
+[ 	]*[1-9][0-9]*[ 	]+
+[ 	]*[1-9][0-9]*[ 	]+inb	%dx, %ax
+[ 	]*[1-9][0-9]*[ 	]+outb	%ax, %dx
+[ 	]*[1-9][0-9]*[ 	]+movb	%ax, %bx
+GAS LISTING .*
+
+

gas/testsuite/gas/i386/inval.s

@@ -104,3 +104,11 @@ movnti word ptr [eax], ax
 	movl	%ds, %ax
 	movl	%ax, %ds
 	movl	%ax, %bx
+
+	movw	%ds, %eax
+	movw	%eax, %ds
+	movw	%eax, %ebx
+
+	inb	%dx, %ax
+	outb	%ax, %dx
+	movb	%ax, %bx