[PATCH v4 1/9] perf annotate: Skip annotating data types to lea instructions

[Zecheng Li <zecheng@google.com>]

Introduce a helper function is_address_gen_insn() to check
arch-dependent address generation instructions like lea in x86. Remove
type annotation on these instructions since they are not accessing
memory. It should be counted as `no_mem_ops`.

Signed-off-by: Zecheng Li <zecheng@google.com>
---
 tools/perf/util/annotate.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index a2e34f149a07..fb60467fa877 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -2698,6 +2698,20 @@ static bool is_stack_canary(struct arch *arch, struct annotated_op_loc *loc)
 	return false;
 }
 
+/**
+ * Returns true if the instruction has a memory operand without
+ * performing a load/store
+ */
+static bool is_address_gen_insn(struct arch *arch, struct disasm_line *dl)
+{
+	if (arch__is(arch, "x86")) {
+		if (!strncmp(dl->ins.name, "lea", 3))
+			return true;
+	}
+
+	return false;
+}
+
 static struct disasm_line *
 annotation__prev_asm_line(struct annotation *notes, struct disasm_line *curr)
 {
@@ -2806,6 +2820,12 @@ __hist_entry__get_data_type(struct hist_entry *he, struct arch *arch,
 		return &stackop_type;
 	}
 
+	if (is_address_gen_insn(arch, dl)) {
+		istat->bad++;
+		ann_data_stat.no_mem_ops++;
+		return NO_TYPE;
+	}
+
 	for_each_insn_op_loc(&loc, i, op_loc) {
 		struct data_loc_info dloc = {
 			.arch = arch,
-- 
2.51.0.788.g6d19910ace-goog