ChangeLog:
2011-11-04 Jiangning Liu <jiangning.liu@arm.com>
PR rtl-optimization/38644
* config/arm/arm.c (thumb1_expand_epilogue): Add memory barrier
for epilogue having stack adjustment.
ChangeLog of testsuite:
2011-11-04 Jiangning Liu <jiangning.liu@arm.com>
PR rtl-optimization/38644
* gcc.target/arm/stack-red-zone.c: New.
@@ -17682,6 +17682,8 @@ thumb1_expand_epilogue (void)
gcc_assert (amount >= 0);
if (amount)
{
+ emit_insn (gen_blockage ());
+
if (amount < 512)
emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
GEN_INT (amount)));
new file mode 100644
@@ -0,0 +1,12 @@
+/* No stack red zone. PR38644. */
+/* { dg-options "-mthumb -O2" } */
+/* { dg-final { scan-assembler "ldrb\[^\n\]*\\n\[\t \]*add\[\t \]*sp" } } */
+
+extern int doStreamReadBlock (int *, char *, int size, int);
+
+char readStream (int *s)
+{
+ char c = 0;
+ doStreamReadBlock (s, &c, 1, *s);
+ return c;
+}