From 75a08622e8754dbc43ccd2f08031227527645d39 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Steinbrink?= <bsteinbr@gmail.com>
Date: Thu, 25 Jul 2013 10:51:45 +0200
Subject: [PATCH] Add a function to check whether a ValueRef is a constant

---
 src/librustc/middle/trans/common.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 713939a5d8319..4099f64263703 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -850,6 +850,12 @@ pub fn const_get_elt(cx: &CrateContext, v: ValueRef, us: &[c_uint])
     }
 }
 
+pub fn is_const(v: ValueRef) -> bool {
+    unsafe {
+        llvm::LLVMIsConstant(v) == True
+    }
+}
+
 pub fn const_to_int(v: ValueRef) -> c_longlong {
     unsafe {
         llvm::LLVMConstIntGetSExtValue(v)