[PATCH v3 2/5] simplify '(x / 1)' to 'x'

[Luc Van Oostenryck <luc.vanoostenryck@gmail.com>]

Currently we simplify multiplication by 1 but nothing
for the similar divide by 1.

This patch add the missing simplification together with
its test cases.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 simplify.c                       | 1 +
 validation/optim/muldiv-by-one.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/simplify.c b/simplify.c
index b242b64d6..91021dbb1 100644
--- a/simplify.c
+++ b/simplify.c
@@ -348,6 +348,7 @@ static int simplify_constant_rightside(struct instruction *insn)
 	case OP_ASR:
 		return simplify_asr(insn, insn->src1, value);
 
+	case OP_DIVU: case OP_DIVS:
 	case OP_MULU: case OP_MULS:
 		return simplify_mul_div(insn, value);
 
diff --git a/validation/optim/muldiv-by-one.c b/validation/optim/muldiv-by-one.c
index ac8ac95b2..f6dd7cb2c 100644
--- a/validation/optim/muldiv-by-one.c
+++ b/validation/optim/muldiv-by-one.c
@@ -3,6 +3,8 @@ typedef	         int si;
 
 si smul1(si a) {  return a * 1; }
 ui umul1(ui a) {  return a * 1; }
+si sdiv1(si a) {  return a / 1; }
+ui udiv1(ui a) {  return a / 1; }
 
 /*
  * check-name: muldiv-by-one
@@ -10,4 +12,5 @@ ui umul1(ui a) {  return a * 1; }
  * check-output-ignore
  *
  * check-output-excludes: mul[us]\\.
+ * check-output-excludes: div[us]\\.
  */
-- 
2.11.0