---

yaml
---
r: 195516
b: refs/heads/master
c: 2e93e38
h: refs/heads/master
v: v3

Author: pnkfelix

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 7875dae83fac23fdf59765eb548c2237850d6b15
+refs/heads/master: 2e93e386fd228176aeb1100bfdf961bdae2b51b9
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: b3317d68910900f135f9f38e43a7a699bc736b4a
 refs/heads/try: 961e0358e1a5c0faaef606e31e9965742c1643bf

trunk/src/librustc_llvm/lib.rs

@@ -1976,6 +1976,7 @@ extern {
     pub fn LLVMIsAArgument(value_ref: ValueRef) -> ValueRef;
 
     pub fn LLVMIsAAllocaInst(value_ref: ValueRef) -> ValueRef;
+    pub fn LLVMIsAConstantInt(value_ref: ValueRef) -> ValueRef;
 
     pub fn LLVMInitializeX86TargetInfo();
     pub fn LLVMInitializeX86Target();

trunk/src/librustc_trans/trans/common.rs

@@ -963,6 +963,32 @@ pub fn const_to_uint(v: ValueRef) -> u64 {
     }
 }
 
+fn is_const_integral(v: ValueRef) -> bool {
+    unsafe {
+        !llvm::LLVMIsAConstantInt(v).is_null()
+    }
+}
+
+pub fn const_to_opt_int(v: ValueRef) -> Option<i64> {
+    unsafe {
+        if is_const_integral(v) {
+            Some(llvm::LLVMConstIntGetSExtValue(v))
+        } else {
+            None
+        }
+    }
+}
+
+pub fn const_to_opt_uint(v: ValueRef) -> Option<u64> {
+    unsafe {
+        if is_const_integral(v) {
+            Some(llvm::LLVMConstIntGetZExtValue(v))
+        } else {
+            None
+        }
+    }
+}
+
 pub fn is_undef(val: ValueRef) -> bool {
     unsafe {
         llvm::LLVMIsUndef(val) != False