1 ; RUN: llc < %s -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 6 target 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" 7 target triple = "x86_64-apple-darwin10.0.0" 8 9 ; FIXME: This test could generate this code: 10 ; 11 ; ## BB#0: ## %entry 12 ; testq %rdi, %rdi 13 ; jns LBB0_2 14 ; ## BB#1: 15 ; movq %rdi, %rax 16 ; shrq %rax 17 ; andq $1, %rdi 18 ; orq %rax, %rdi 19 ; cvtsi2ssq %rdi, %xmm0 20 ; addss %xmm0, %xmm0 21 ; ret 22 ; LBB0_2: ## %entry 23 ; cvtsi2ssq %rdi, %xmm0 24 ; ret 25 ; 26 ; The blocks come from lowering: 27 ; 28 ; %vreg7<def> = CMOV_FR32 %vreg6<kill>, %vreg5<kill>, 15, %EFLAGS<imp-use>; FR32:%vreg7,%vreg6,%vreg5 29 ; 30 ; If the instruction had an EFLAGS<kill> flag, it wouldn't need to mark EFLAGS 31 ; as live-in on the new blocks, and machine sinking would be able to sink 32 ; everything below the test. 33 34 ; CHECK: shrq 35 ; CHECK: andq 36 ; CHECK-NEXT: orq 37 ; CHECK: testq %rdi, %rdi 38 ; CHECK-NEXT: jns LBB0_2 39 ; CHECK: cvtsi2ss 40 ; CHECK: LBB0_2 41 ; CHECK-NEXT: cvtsi2ss 42 define float @test(i64 %a) { 43 entry: 44 %b = uitofp i64 %a to float 45 ret float %b 46 } 47
