i386.md (cmpqi_minus_1): Use q constraints instead of r.

	* config/i386/i386.md (cmpqi_minus_1): Use q constraints instead of r.

	* gcc.c-torture/compile/20010117-2.c: New test.

From-SVN: r39093

gcc/ChangeLog

 2001-01-17  Jakub Jelinek  <jakub@redhat.com>
 
 	* config/i386/i386.md (cmpqi_minus_1): Use {b} for QImode operation.
+	Use q constraints instead of r.
 
 Tue Jan 16 22:23:04 2001  Alan Modra (alan@linuxcare.com.au)
 

gcc/config/i386/i386.md

@@ -1154,8 +1154,8 @@
 
 (define_insn "*cmpqi_minus_1"
   [(set (reg 17)
-	(compare (minus:QI (match_operand:QI 0 "nonimmediate_operand" "rm,r")
-			   (match_operand:QI 1 "general_operand" "ri,mr"))
+	(compare (minus:QI (match_operand:QI 0 "nonimmediate_operand" "qm,q")
+			   (match_operand:QI 1 "general_operand" "qi,mq"))
 		 (const_int 0)))]
   "ix86_match_ccmode (insn, CCGOCmode)"
   "cmp{b}\\t{%1, %0|%0, %1}"

gcc/testsuite/ChangeLog

 2001-01-17  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc.c-torture/compile/20010117-1.c: New test.
+	* gcc.c-torture/compile/20010117-2.c: New test.
 
 2001-01-15  Toon Moene  <toon@moene.indiv.nluug.nl>
 

gcc/testsuite/gcc.c-torture/compile/20010117-2.c

+unsigned char a, b;
+
+void baz (void)
+{
+  if (b & 0x08)
+    {
+      int g = 0;
+      int c = (b & 0x01);
+      int d = a - g - c;
+      int e = (a & 0x0f) - (g & 0x0f);
+      int f = (a & 0xf0) - (g & 0xf0);
+      int h = (a & 0x0f) - (g & 0x0f);
+
+      if ((a ^ g) & (a ^ d) & 0x80) b |= 0x40;
+      if ((d & 0xff00) == 0) b |= 0x01;
+      if (!((a - h - c) & 0xff)) b |= 0x02;
+      if ((a - g - c) & 0x80) b |= 0x80;
+      a = (e & 0x0f) | (f & 0xf0);
+    }
+}