llvm-project/llvm/test/CodeGen/SystemZ/fp-conv-01.ll

; Test floating-point truncations.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s

; Test f64->f32.
define float @f1(double %d1, double %d2) {
; CHECK-LABEL: f1:
; CHECK: ledbr %f0, %f2
; CHECK: br %r14
  %res = fptrunc double %d2 to float
  ret float %res
}

; Test f128->f32.
define float @f2(fp128 *%ptr) {
; CHECK-LABEL: f2:
; CHECK: lexbr %f0, %f0
; CHECK: br %r14
  %val = load fp128 *%ptr
  %res = fptrunc fp128 %val to float
  ret float %res
}

; Make sure that we don't use %f0 as the destination of LEXBR when %f2
; is still live.
define void @f3(float *%dst, fp128 *%ptr, float %d1, float %d2) {
; CHECK-LABEL: f3:
; CHECK: lexbr %f1, %f1
; CHECK: aebr %f1, %f2
; CHECK: ste %f1, 0(%r2)
; CHECK: br %r14
  %val = load fp128 *%ptr
  %conv = fptrunc fp128 %val to float
  %res = fadd float %conv, %d2
  store float %res, float *%dst
  ret void
}

; Test f128->f64.
define double @f4(fp128 *%ptr) {
; CHECK-LABEL: f4:
; CHECK: ldxbr %f0, %f0
; CHECK: br %r14
  %val = load fp128 *%ptr
  %res = fptrunc fp128 %val to double
  ret double %res
}

; Like f3, but for f128->f64.
define void @f5(double *%dst, fp128 *%ptr, double %d1, double %d2) {
; CHECK-LABEL: f5:
; CHECK: ldxbr %f1, %f1
; CHECK: adbr %f1, %f2
; CHECK: std %f1, 0(%r2)
; CHECK: br %r14
  %val = load fp128 *%ptr
  %conv = fptrunc fp128 %val to double
  %res = fadd double %conv, %d2
  store double %res, double *%dst
  ret void
}