llvm-project/llvm/test/CodeGen/X86/misched-copy.ll

; REQUIRES: asserts
; RUN: llc < %s -verify-machineinstrs -mtriple=i686-- -mcpu=core2 -pre-RA-sched=source -enable-misched -verify-misched -debug-only=machine-scheduler -o - 2>&1 > /dev/null | FileCheck %s
;
; Test scheduling of copy instructions.
;
; Argument copies should be hoisted to the top of the block.
; Return copies should be sunk to the end.
; MUL_HiLo PhysReg use copies should be just above the mul.
; MUL_HiLo PhysReg def copies should be just below the mul.
;
; CHECK: *** Final schedule for %bb.1 ***
; CHECK:      $eax = COPY
; CHECK-NEXT: MUL32r %{{[0-9]+}}:gr32, implicit-def $eax, implicit-def $edx, implicit-def dead $eflags, implicit $eax
; CHECK-NEXT: COPY $e{{[ad]}}x
; CHECK-NEXT: COPY $e{{[ad]}}x
; CHECK:      DIVSSrm
define i64 @mulhoist(i32 %a, i32 %b) #0 {
entry:
  br label %body

body:
  %convb = sitofp i32 %b to float
  ; Generates an iMUL64r to legalize types.
  %aa = zext i32 %a to i64
  %mul = mul i64 %aa, 74383
  ; Do some dependent long latency stuff.
  %trunc = trunc i64 %mul to i32
  %convm = sitofp i32 %trunc to float
  %divm = fdiv float %convm, 0.75
  ;%addmb = fadd float %divm, %convb
  ;%divmb = fdiv float %addmb, 0.125
  ; Do some independent long latency stuff.
  %conva = sitofp i32 %a to float
  %diva = fdiv float %conva, 0.75
  %addab = fadd float %diva, %convb
  %divab = fdiv float %addab, 0.125
  br label %end

end:
  %val = fptosi float %divab to i64
  %add = add i64 %mul, %val
  ret i64 %add
}

attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }

!0 = !{!"float", !1}
!1 = !{!"omnipotent char", !2}
!2 = !{!"Simple C/C++ TBAA"}