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llvm-mirror/test/CodeGen/X86/uint64-to-float.ll
Jakob Stoklund Olesen 6f0c76740b Update live-in lists when splitting critical edges.
Fixes PR10814. Patch by Jan Sjödin!

llvm-svn: 141960
2011-10-14 17:25:46 +00:00

47 lines
1.3 KiB
LLVM

; RUN: llc < %s -march=x86-64 | FileCheck %s
; Verify that we are using the efficient uitofp --> sitofp lowering illustrated
; by the compiler_rt implementation of __floatundisf.
; <rdar://problem/8493982>
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"
target triple = "x86_64-apple-darwin10.0.0"
; FIXME: This test could generate this code:
;
; ## BB#0: ## %entry
; testq %rdi, %rdi
; jns LBB0_2
; ## BB#1:
; movq %rdi, %rax
; shrq %rax
; andq $1, %rdi
; orq %rax, %rdi
; cvtsi2ssq %rdi, %xmm0
; addss %xmm0, %xmm0
; ret
; LBB0_2: ## %entry
; cvtsi2ssq %rdi, %xmm0
; ret
;
; The blocks come from lowering:
;
; %vreg7<def> = CMOV_FR32 %vreg6<kill>, %vreg5<kill>, 15, %EFLAGS<imp-use>; FR32:%vreg7,%vreg6,%vreg5
;
; If the instruction had an EFLAGS<kill> flag, it wouldn't need to mark EFLAGS
; as live-in on the new blocks, and machine sinking would be able to sink
; everything below the test.
; CHECK: shrq
; CHECK: andq
; CHECK-NEXT: orq
; CHECK: testq %rdi, %rdi
; CHECK-NEXT: jns LBB0_2
; CHECK: cvtsi2ss
; CHECK: LBB0_2
; CHECK-NEXT: cvtsi2ss
define float @test(i64 %a) {
entry:
%b = uitofp i64 %a to float
ret float %b
}