Subzero: Initial O2 lowering

tests_lit/llvm2ice_tests/bitcast.ll

 ; Trivial smoke test of bitcast between integer and FP types.
 
-; RUN: %llvm2ice --verbose inst %s | FileCheck %s
+; RUN: %llvm2ice -O2 --verbose none %s | FileCheck %s
 ; RUN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
 ; RUN: %llvm2iceinsts %s | %szdiff %s | FileCheck --check-prefix=DUMP %s
 ; RUN: %llvm2iceinsts --pnacl %s | %szdiff %s \
 ; RUN:                           | FileCheck --check-prefix=DUMP %s
 
 define internal i32 @cast_f2i(float %f) {
 entry:
   %v0 = bitcast float %f to i32
-; CHECK: bitcast
   ret i32 %v0
 }
 
+; CHECK: mov eax
+; CHECK: ret
+
 define internal float @cast_i2f(i32 %i) {
 entry:
   %v0 = bitcast i32 %i to float
-; CHECK: bitcast
   ret float %v0
 }
 
+; CHECK: fld dword ptr
+; CHECK: ret
+
 define internal i64 @cast_d2ll(double %d) {
 entry:
   %v0 = bitcast double %d to i64
-; CHECK: bitcast
   ret i64 %v0
 }
 
+; CHECK: mov edx
+; CHECK: ret
+
 define internal double @cast_ll2d(i64 %ll) {
 entry:
   %v0 = bitcast i64 %ll to double
-; CHECK: bitcast
   ret double %v0
 }
 
+; CHECK: fld qword ptr
+; CHECK: ret
+
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ