From ad7dea1e96fdebc682b10e02dd14456cdccf4dfa Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 19 Sep 2011 11:50:53 -0400
Subject: [PATCH] gc: handle complex CONVNOP

Fixes #2256.

R=ken2
CC=golang-dev
https://golang.org/cl/5044047
---
 src/cmd/gc/cplx.c |  3 +++
 test/ken/cplx2.go | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/cmd/gc/cplx.c b/src/cmd/gc/cplx.c
index 5bc8d64aa2..52038e71c3 100644
--- a/src/cmd/gc/cplx.c
+++ b/src/cmd/gc/cplx.c
@@ -133,6 +133,9 @@ complexgen(Node *n, Node *res)
 		dump("\ncomplexgen-n", n);
 		dump("complexgen-res", res);
 	}
+	
+	while(n->op == OCONVNOP)
+		n = n->left;
 
 	// pick off float/complex opcodes
 	switch(n->op) {
diff --git a/test/ken/cplx2.go b/test/ken/cplx2.go
index b36e93ecd6..89f4a04181 100644
--- a/test/ken/cplx2.go
+++ b/test/ken/cplx2.go
@@ -105,4 +105,16 @@ func main() {
 		println("opcode x", ce, Ce)
 		panic("fail")
 	}
+	
+	r32 := real(complex64(ce))
+	if r32 != float32(real(Ce)) {
+		println("real(complex64(ce))", r32, real(Ce))
+		panic("fail")
+	}
+	
+	r64 := real(complex128(ce))
+	if r64 != real(Ce) {
+		println("real(complex128(ce))", r64, real(Ce))
+		panic("fail")
+	}
 }