test/CodeGen/X86/fp-double-rounding.ll

; RUN: llc < %s | FileCheck %s

target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--"

; CHECK-LABEL: double_rounding_safe:
; CHECK: callq __trunctfdf2
; CHECK-NEXT: cvtsd2ss %xmm0
define void @double_rounding_safe(ptr %x, ptr %f) {
entry:
  %x.fp128 = load fp128, ptr %x, align 16
  %x.double = fptrunc fp128 %x.fp128 to double
  %x.float = fptrunc double %x.double to float
  store float %x.float, ptr %f, align 4
  ret void
}

; CHECK-LABEL: double_rounding_contract_fst:
; CHECK: callq __trunctfdf2
; CHECK-NEXT: cvtsd2ss %xmm0
define void @double_rounding_contract_fst(ptr %x, ptr %f) {
entry:
  %x.fp128 = load fp128, ptr %x, align 16
  %x.double = fptrunc contract fp128 %x.fp128 to double
  %x.float = fptrunc double %x.double to float
  store float %x.float, ptr %f, align 4
  ret void
}

; CHECK-LABEL: double_rounding_contract_snd:
; CHECK: callq __trunctfdf2
; CHECK-NEXT: cvtsd2ss %xmm0
define void @double_rounding_contract_snd(ptr %x, ptr %f) {
entry:
  %x.fp128 = load fp128, ptr %x, align 16
  %x.double = fptrunc fp128 %x.fp128 to double
  %x.float = fptrunc contract double %x.double to float
  store float %x.float, ptr %f, align 4
  ret void
}

; CHECK-LABEL: double_rounding:
; CHECK: callq __trunctfsf2
; CHECK-NOT: cvt
define void @double_rounding(ptr %x, ptr %f) {
entry:
  %x.fp128 = load fp128, ptr %x, align 16
  %x.double = fptrunc contract fp128 %x.fp128 to double
  %x.float = fptrunc contract double %x.double to float
  store float %x.float, ptr %f, align 4
  ret void
}

; CHECK-LABEL: double_rounding_precise_first:
; CHECK: fstps (%
; CHECK-NOT: fstpl
define void @double_rounding_precise_first(ptr %f) {
entry:
  ; Hack, to generate a precise FP_ROUND to double
  %precise = call double asm sideeffect "fld %st(0)", "={st(0)}"()
  %0 = fptrunc double %precise to float
  store float %0, ptr %f, align 4
  ret void
}