1; RUN: llc < %s -mcpu=generic -march=x86-64 | FileCheck %s
2; Verify that we are using the efficient uitofp --> sitofp lowering illustrated
3; by the compiler_rt implementation of __floatundisf.
4; <rdar://problem/8493982>
5
6target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
7target triple = "x86_64-apple-darwin10.0.0"
8
9; CHECK: testq %rdi, %rdi
10; CHECK-NEXT: js LBB0_1
11; CHECK: cvtsi2ss
12; CHECK-NEXT: ret
13; CHECK: LBB0_1
14; CHECK: shrq
15; CHECK-NEXT: andq
16; CHECK-NEXT: orq
17; CHECK-NEXT: cvtsi2ss
18define float @test(i64 %a) {
19entry:
20  %b = uitofp i64 %a to float
21  ret float %b
22}
23