support llvm_ctpop_*; fixes #918

src/library.js

@@ -4896,6 +4896,20 @@ LibraryManager.library = {
 #endif
   },
 
+  llvm_ctpop_i32: function(x) {
+    var ret = 0;
+    while (x) {
+      if (x&1) ret++;
+      x >>= 1;
+    }
+    return ret;
+  },
+
+  llvm_ctpop_i64__deps: ['llvm_ctpop_i32'],
+  llvm_ctpop_i64: function(l, h) {
+    return _llvm_ctpop_i32(l) + _llvm_ctpop_i32(h);
+  },
+
   llvm_trap: function() {
     throw 'trap! ' + new Error().stack;
   },

tests/runner.py

@@ -1253,6 +1253,8 @@ m_divisor is 1091269979
           extern int64_t llvm_ctlz_i64(int64_t x);
           extern int32_t llvm_cttz_i32(int32_t x);
           extern int64_t llvm_cttz_i64(int64_t x);
+          extern int32_t llvm_ctpop_i32(int32_t x);
+          extern int64_t llvm_ctpop_i64(int64_t x);
           extern int llvm_expect_i32(int x, int y);
         }
 
@@ -1269,6 +1271,7 @@ m_divisor is 1091269979
 
             printf("%d,%d\n", (int)llvm_ctlz_i64(((int64_t)1) << 40), llvm_ctlz_i32(1<<10));
             printf("%d,%d\n", (int)llvm_cttz_i64(((int64_t)1) << 40), llvm_cttz_i32(1<<10));
+            printf("%d,%d\n", (int)llvm_ctpop_i64((0x3101ULL << 32) | 1), llvm_ctpop_i32(0x3101));
 
             printf("%d\n", llvm_expect_i32(x % 27, 3));
 
@@ -1285,6 +1288,7 @@ c8,ef
 c5,de,15,8a
 23,21
 40,10
+5,4
 13
 72057594037927936
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