[PATCH 08/22] reassoc: simplify (x # C) # K --> x # eval(C # K)

[Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>]

Do this simplification once for all associative binops.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
 simplify.c                        | 5 +++++
 validation/optim/reassoc-op-op1.c | 1 -
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/simplify.c b/simplify.c
index 3935552bd6fa..b14f88405861 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1295,6 +1295,11 @@ static int simplify_associative_binop(struct instruction *insn)
 		return 0;
 	if (!simple_pseudo(def->src2))
 		return 0;
+	if (constant(def->src2) && constant(insn->src2)) {
+		// (x # C) # K --> x # eval(C # K)
+		insn->src2 = eval_op(insn->opcode, insn->size, insn->src2, def->src2);
+		return replace_pseudo(insn, &insn->src1, def->src1);
+	}
 	if (multi_users(def->target))
 		return 0;
 	switch_pseudo(def, &def->src1, insn, &insn->src2);
diff --git a/validation/optim/reassoc-op-op1.c b/validation/optim/reassoc-op-op1.c
index aa7092ff57a0..3d050c142249 100644
--- a/validation/optim/reassoc-op-op1.c
+++ b/validation/optim/reassoc-op-op1.c
@@ -8,7 +8,6 @@ int foo(int x, int *ptr)
 /*
  * check-name: reassoc-op-op1
  * check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
  *
  * check-output-ignore
  * check-output-pattern(1): add\\.
-- 
2.28.0