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2011-02-02 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
Backport from mainline:
2011-01-23 Bernd Schmidt <bernds@codesourcery.com>
Richard Sandiford <rdsandiford@googlemail.com>
PR rtl-optimization/47166
* reload1.c (emit_reload_insns): Disable the spill_reg_store
mechanism for PRE_MODIFY and POST_MODIFY.
(inc_for_reload): For PRE_MODIFY, return the insn that sets the
reloadreg.
gcc/testsuite/
* gcc.c-torture/execute/postmod-1.c: New test.
=== added file 'gcc/testsuite/gcc.c-torture/execute/postmod-1.c'
--- old/gcc/testsuite/gcc.c-torture/execute/postmod-1.c 1970-01-01 00:00:00 +0000
+++ new/gcc/testsuite/gcc.c-torture/execute/postmod-1.c 2011-02-02 14:23:10 +0000
@@ -0,0 +1,62 @@
+#define DECLARE_ARRAY(A) array##A[0x10]
+#define DECLARE_COUNTER(A) counter##A = 0
+#define DECLARE_POINTER(A) *pointer##A = array##A + x
+/* Create a loop that allows post-modification of pointerA, followed by
+ a use of the post-modified address. */
+#define BEFORE(A) counter##A += *pointer##A, pointer##A += 3
+#define AFTER(A) counter##A += pointer##A[x]
+
+/* Set up the arrays so that one iteration of the loop sets the counter
+ to 3.0f. */
+#define INIT_ARRAY(A) array##A[1] = 1.0f, array##A[5] = 2.0f
+
+/* Check that the loop worked correctly for all values. */
+#define CHECK_ARRAY(A) exit_code |= (counter##A != 3.0f)
+
+/* Having 6 copies triggered the bug for ARM and Thumb. */
+#define MANY(A) A (0), A (1), A (2), A (3), A (4), A (5)
+
+/* Each addendA should be allocated a register. */
+#define INIT_VOLATILE(A) addend##A = vol
+#define ADD_VOLATILE(A) vol += addend##A
+
+/* Having 5 copies triggered the bug for ARM and Thumb. */
+#define MANY2(A) A (0), A (1), A (2), A (3), A (4)
+
+float MANY (DECLARE_ARRAY);
+float MANY (DECLARE_COUNTER);
+
+volatile int stop = 1;
+volatile int vol;
+
+void __attribute__((noinline))
+foo (int x)
+{
+ float MANY (DECLARE_POINTER);
+ int i;
+
+ do
+ {
+ MANY (BEFORE);
+ MANY (AFTER);
+ /* Create an inner loop that should ensure the code above
+ has registers free for reload inheritance. */
+ {
+ int MANY2 (INIT_VOLATILE);
+ for (i = 0; i < 10; i++)
+ MANY2 (ADD_VOLATILE);
+ }
+ }
+ while (!stop);
+}
+
+int
+main (void)
+{
+ int exit_code = 0;
+
+ MANY (INIT_ARRAY);
+ foo (1);
+ MANY (CHECK_ARRAY);
+ return exit_code;
+}
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