+2002-06-10 Jakub Jelinek <jakub@redhat.com>
+
+ PR optimization/6842
+ * combine.c (combine_simplify_rtx) [SUBREG]: Don't ICE if VOIDmode
+ operand subreg cannot be simplified.
+
2002-06-10 Jakub Jelinek <jakub@redhat.com>
* varasm.c (const_hash): Handle FDESC_EXPR like ADDR_EXPR.
/* simplify_subreg can't use gen_lowpart_for_combine. */
if (CONSTANT_P (SUBREG_REG (x))
- && subreg_lowpart_offset (mode, op0_mode) == SUBREG_BYTE (x))
+ && subreg_lowpart_offset (mode, op0_mode) == SUBREG_BYTE (x)
+ /* Don't call gen_lowpart_for_combine if the inner mode
+ is VOIDmode and we cannot simplify it, as SUBREG without
+ inner mode is invalid. */
+ && (GET_MODE (SUBREG_REG (x)) != VOIDmode
+ || gen_lowpart_common (mode, SUBREG_REG (x))))
return gen_lowpart_for_combine (mode, SUBREG_REG (x));
if (GET_MODE_CLASS (GET_MODE (SUBREG_REG (x))) == MODE_CC)
* g++.dg/opt/vt1.C: New test.
+ * gcc.dg/20020531-1.c: New test.
+
2002-06-07 Roger Sayle <roger@eyesopen.com>
* gcc.dg/20020607-2.c: New test case.
--- /dev/null
+/* PR optimization/6842
+ This testcase caused ICE when trying to optimize V8QI subreg of VOIDmode
+ CONST_DOUBLE. */
+/* { dg-do compile { target i?86-*-* } } */
+/* { dg-options "-O2 -mmmx" } */
+
+typedef int __v8qi __attribute__ ((__mode__ (__V8QI__)));
+extern void abort (void);
+extern void exit (int);
+
+void foo (void)
+{
+ unsigned long long a = 0x0102030405060708LL;
+ unsigned long long b = 0x1020304050607080LL;
+ unsigned long long c;
+
+ c = (unsigned long long) __builtin_ia32_paddusb ((__v8qi) a, (__v8qi) b);
+ __builtin_ia32_emms ();
+ if (c != 0x1122334455667788)
+ abort ();
+}