Truncate booleans to 0/1 in truncating t-to-i.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 71c1f86d97a2d3a428450c68840522020ee33909..801c30bbdf606a466758fae3c54d8ec35c003e05 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -4970,18 +4970,33 @@ void LCodeGen::DoDeferredTaggedToI(LTaggedToI* instr) {
   if (instr->truncating()) {
     // Performs a truncating conversion of a floating point number as used by
     // the JS bitwise operations.
-    Label heap_number;
-    __ b(eq, &heap_number);
-    // Check for undefined. Undefined is converted to zero for truncating
-    // conversions.
+    Label no_heap_number, check_bools, check_false;
+    __ b(ne, &no_heap_number);
+    __ TruncateHeapNumberToI(input_reg, scratch2);
+    __ b(&done);
+
+    // Check for Oddballs. Undefined/False is converted to zero and True to one
+    // for truncating conversions.
+    __ bind(&no_heap_number);
     __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
     __ cmp(scratch2, Operand(ip));
-    DeoptimizeIf(ne, instr->environment());
+    __ b(ne, &check_bools);
     __ mov(input_reg, Operand::Zero());
     __ b(&done);
 
-    __ bind(&heap_number);
-    __ TruncateHeapNumberToI(input_reg, scratch2);
+    __ bind(&check_bools);
+    __ LoadRoot(ip, Heap::kTrueValueRootIndex);
+    __ cmp(scratch2, Operand(ip));
+    __ b(ne, &check_false);
+    __ mov(input_reg, Operand(1));
+    __ b(&done);
+
+    __ bind(&check_false);
+    __ LoadRoot(ip, Heap::kFalseValueRootIndex);
+    __ cmp(scratch2, Operand(ip));
+    DeoptimizeIf(ne, instr->environment());
+    __ mov(input_reg, Operand::Zero());
+    __ b(&done);
   } else {
     // Deoptimize if we don't have a heap number.
     DeoptimizeIf(ne, instr->environment());