From 100901574b90d9ef0ee9edc49fd896a47bb716c0 Mon Sep 17 00:00:00 2001
From: Ayke van Laethem <aykevanlaethem@gmail.com>
Date: Fri, 16 Nov 2018 23:02:09 +0100
Subject: [PATCH] compiler: let escape analysis look across bitcasts

This is necessary to avoid memory allocation in the math packages in
some functions.
---
 compiler/optimizer.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler/optimizer.go b/compiler/optimizer.go
index 2e3aabfe..06c0aae6 100644
--- a/compiler/optimizer.go
+++ b/compiler/optimizer.go
@@ -207,6 +207,11 @@ func (c *Compiler) doesEscape(value llvm.Value) bool {
 			if c.doesEscape(use) {
 				return true
 			}
+		} else if use.IsABitCastInst() != nilValue {
+			// A bitcast escapes if the casted-to value escapes.
+			if c.doesEscape(use) {
+				return true
+			}
 		} else if use.IsALoadInst() != nilValue {
 			// Load does not escape.
 		} else if use.IsAStoreInst() != nilValue {