---

yaml
---
r: 196219
b: refs/heads/tmp
c: 2e93e38
h: refs/heads/master
i:
  196217: e58805b
  196215: 11ee5bf
v: v3

Author: pnkfelix

[refs]

@@ -32,7 +32,7 @@ refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
 refs/heads/beta: 9854143cba679834bc4ef932858cd5303f015a0e
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
-refs/heads/tmp: 7875dae83fac23fdf59765eb548c2237850d6b15
+refs/heads/tmp: 2e93e386fd228176aeb1100bfdf961bdae2b51b9
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f
 refs/tags/homu-tmp: 53a183f0274316596bf9405944d4f0468d8c93e4
 refs/heads/gate: 97c84447b65164731087ea82685580cc81424412

branches/tmp/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();

branches/tmp/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