re PR inline-asm/11676 (operand to volatile asm incorrectly removed)

        PR inline-asm/11676
        * cse.c (count_reg_usage): Handle asm_operands properly.

From-SVN: r69816

gcc/ChangeLog

+2003-07-26  Richard Henderson  <rth@redhat.com>
+
+	PR inline-asm/11676
+	* cse.c (count_reg_usage): Handle asm_operands properly.
+
 2003-07-26  Roger Sayle  <roger@eyesopen.com>
 
 	* builtins.def (DEF_FALLBACK_BUILTIN): Delete.

gcc/cse.c

@@ -7384,6 +7384,16 @@ count_reg_usage (rtx x, int *counts, rtx dest, int incr)
       count_reg_usage (XEXP (x, 1), counts, NULL_RTX, incr);
       return;
 
+    case ASM_OPERANDS:
+      /* If the asm is volatile, then this insn cannot be deleted,
+	 and so the inputs *must* be live.  */
+      if (MEM_VOLATILE_P (x))
+	dest = NULL_RTX;
+      /* Iterate over just the inputs, not the constraints as well.  */
+      for (i = ASM_OPERANDS_INPUT_LENGTH (x) - 1; i >= 0; i--)
+	count_reg_usage (ASM_OPERANDS_INPUT (x, i), counts, dest, incr);
+      return;
+
     case INSN_LIST:
       abort ();
 

gcc/testsuite/gcc.dg/asm-8.c

+/* PR inline-asm/11676 */
+/* { dg-do compile } */
+/* { dg-options "-O -Wall" } */
+
+void foo(void)
+{
+  long x = 0;
+  asm volatile ("" : "=r"(x) : "r"(x)); /* { dg-bogus "uninitialized" } */
+}

gcc/testsuite/gcc.dg/i386-asm-1.c

+/* PR inline-asm/11676 */
+/* { dg-do run { target i?86-*-* } } */
+/* { dg-options "-O2" } */
+
+static int bar(int x) __asm__("bar");
+static int __attribute__((regparm(1), noinline, used))
+bar(int x)
+{
+  if (x != 0)
+    abort ();
+}
+
+static int __attribute__((regparm(1), noinline))
+foo(int x)
+{
+  x = 0;
+  __asm__ __volatile__("call bar" : "=a"(x) : "a"(x));
+}
+
+int main()
+{
+  foo(1);
+  return 0;
+}