--- a/js/src/asmjs/AsmJSValidate.cpp
+++ b/js/src/asmjs/AsmJSValidate.cpp
@@ -2004,17 +2004,20 @@ IsCoercionCall(ModuleCompiler &m, ParseN
     return false;
 }
 
 static bool
 IsFloatLiteral(ModuleCompiler &m, ParseNode *pn)
 {
     ParseNode *coercedExpr;
     AsmJSCoercion coercion;
-    if (!IsCoercionCall(m, pn, &coercion, &coercedExpr) || coercion != AsmJS_FRound)
+    if (!IsCoercionCall(m, pn, &coercion, &coercedExpr))
+        return false;
+    // Don't fold into || to avoid clang/memcheck bug (bug 1077031).
+    if (coercion != AsmJS_FRound)
         return false;
     return IsNumericNonFloatLiteral(coercedExpr);
 }
 
 static unsigned
 SimdTypeToLength(AsmJSSimdType type)
 {
     switch (type) {

--- a/js/src/jit-test/tests/asm.js/testBasic.js
+++ b/js/src/jit-test/tests/asm.js/testBasic.js
@@ -5,16 +5,17 @@ assertAsmTypeFail(USE_ASM);
 assertAsmTypeFail(USE_ASM + 'return');
 assertAsmTypeFail(USE_ASM + 'function f() 0');
 assertAsmTypeFail(USE_ASM + 'function f(){}');
 assertAsmTypeFail(USE_ASM + 'function f(){} return 0');
 assertAsmTypeFail(USE_ASM + 'function f() 0; return 0');
 assertAsmTypeFail(USE_ASM + 'function f(){} return g');
 assertAsmTypeFail(USE_ASM + 'function f(){} function f(){} return f');
 assertAsmTypeFail(USE_ASM + 'function f(){}; function g(){}; return {f, g}');
+assertAsmTypeFail(USE_ASM + 'var f = f;');
 assertAsmTypeFail(USE_ASM + 'var f=0; function f(){} return f');
 assertAsmTypeFail(USE_ASM + 'var f=glob.Math.imul; return {}');
 assertAsmTypeFail('glob', USE_ASM + 'var f=glob.Math.imul; function f(){} return f');
 assertAsmTypeFail('glob','foreign', USE_ASM + 'var f=foreign.foo; function f(){} return f');
 assertAsmTypeFail(USE_ASM + 'function f(){} var f=[f,f]; return f');
 assertAsmTypeFail(USE_ASM + 'function f() 0; return f');
 assertAsmTypeFail('"use strict";' + USE_ASM + 'function f() {} return f');
 assertAsmTypeFail(USE_ASM + '"use strict"; function f() {} return f');