On x86 64-bit variables (eg. of type double) require 2 stack slots. We
must return the one which has lower memory address so that we can
correctly execute movsd instruction with that address.
Signed-off-by: Tomek Grabiec <tgrab...@gmail.com>
---
arch/x86/insn-selector.brg | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/arch/x86/insn-selector.brg b/arch/x86/insn-selector.brg
index 46e1e8d..39aaf6e 100644
--- a/arch/x86/insn-selector.brg
+++ b/arch/x86/insn-selector.brg
@@ -88,6 +88,30 @@ static void method_args_cleanup(struct basic_block *bb,
struct tree_node *tree,
select_insn(bb, tree, imm_reg_insn(INSN_ADD_IMM_REG, args_size,
stack_ptr));
}
+/**
+ * Returns the local slot for 64-bit value. On x86 such value requires
+ * 2 stack slots. We must return the one which has lower memory
+ * address.
+ */
+static struct stack_slot *
+get_local_slot_64(struct stack_frame *frame, unsigned long idx)
+{
+ struct stack_slot *s1, *s2;
+
+#ifdef CONFIG_X86_32
+ s1 = get_local_slot(frame, idx);
+ s2 = get_local_slot(frame, idx + 1);
+
+ if ((long) slot_offset(s1) < 0)
+ return s2; /* Local variable, decreasing addresses. */
+
+ /* This slot corresponds to call argument, increasing addresses. */
+ return s1;
+#else
+ return get_local_slot(frame, idx);
+#endif
+}
+
struct _MBState;
static void __binop_reg_local(struct _MBState *, struct basic_block *, struct
tree_node *, enum insn_type, struct var_info *, long);
--
1.6.0.6
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