asm-mem: does it clobber memory?

An asm statement can specify that it clobbers memory.
Add this info directly in the corresponding instruction, avoiding
the need to scan the clobber list each time.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

2 files changed, 8 insertions, 1 deletions

diff --git a/linearize.c b/linearize.c
index 33d641b4..4140b60c 100644
--- a/linearize.c
+++ b/linearize.c
@@ -2174,7 +2174,7 @@ static void add_asm_output(struct entrypoint *ep, struct instruction *insn, stru
 static pseudo_t linearize_asm_statement(struct entrypoint *ep, struct statement *stmt)
 {
 	struct instruction *insn;
-	struct expression *expr;
+	struct expression *expr, *clob;
 	struct asm_rules *rules;
 	struct asm_operand *op;
 
@@ -2206,6 +2206,12 @@ static pseudo_t linearize_asm_statement(struct entrypoint *ep, struct statement
 		add_asm_output(ep, insn, op);
 	} END_FOR_EACH_PTR(op);
 
+	/* and finally, look if it clobbers memory */
+	FOR_EACH_PTR(stmt->asm_clobbers, clob) {
+		if (!strcmp(clob->string->data, "memory"))
+			insn->clobber_memory = 1;
+	} END_FOR_EACH_PTR(clob);
+
 	return VOID;
 }
 
diff --git a/linearize.h b/linearize.h
index a77e4b3e..fb513276 100644
--- a/linearize.h
+++ b/linearize.h
@@ -150,6 +150,7 @@ struct instruction {
 		struct /* asm */ {
 			const char *string;
 			struct asm_rules *asm_rules;
+			int clobber_memory:1;
 		};
 	};
 };