2005-05-08  Roger Sayle  <roger@eyesopen.com>

	PR inline-asm/8788

	* stmt.c (expand_asm_operands): Avoid calling force_reg on BLKmode

	operands.

	* gcc.dg/pr8788-1.c: New testcase.

--- gcc/stmt.c	(revision 99421)

+++ gcc/stmt.c	(revision 99422)

@@ -1703,7 +1703,7 @@ expand_asm_operands (tree string, tree o

       if (asm_operand_ok (op, constraint) <= 0)

 	{

-	  if (allows_reg)

+	  if (allows_reg && TYPE_MODE (type) != BLKmode)

 	    op = force_reg (TYPE_MODE (type), op);

 	  else if (!allows_mem)

 	    warning ("asm operand %d probably doesn't match constraints",

--- gcc/testsuite/gcc.dg/pr8788-1.c	(revision 0)

+++ gcc/testsuite/gcc.dg/pr8788-1.c	(revision 99422)

@@ -0,0 +1,20 @@

+/* PR inline-asm/8788 */

+/* { dg-do compile } */

+/* { dg-options "-O2" } */

+

+typedef struct {

+    long x[6];

+} myjmp_buf;

+

+typedef struct {

+    myjmp_buf regs;

+} my_stack;

+

+void switch_to_stack (my_stack *stack){

+    asm (  /* { dg-error "impossible constraint" } */

+/* { dg-warning "asm operand 1" "asm operand 1" { target *-*-* } 14 } */

+        "\n"

+        : "+r" (stack->regs)

+    );

+}

+