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llvm/llvm/test/CodeGen/RISCV/machine-combiner-mir.ll 

; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs -mcpu=sifive-u74 \
; RUN: -O1 -riscv-enable-machine-combiner=true        \
; RUN: -stop-after machine-combiner < %s | FileCheck %s

define double @test_reassoc_fadd1(double %a0, double %a1, double %a2, double %a3) {
  ; CHECK-LABEL: name: test_reassoc_fadd1
  ; CHECK: bb.0 (%ir-block.0):
  ; CHECK-NEXT:   liveins: $f10_d, $f11_d, $f12_d, $f13_d
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:fpr64 = COPY $f13_d
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:fpr64 = COPY $f12_d
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:fpr64 = COPY $f11_d
  ; CHECK-NEXT:   [[COPY3:%[0-9]+]]:fpr64 = COPY $f10_d
  ; CHECK-NEXT:   [[FADD_D:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D [[COPY3]], [[COPY2]], 7, implicit $frm
  ; CHECK-NEXT:   [[FADD_D1:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D [[COPY1]], [[COPY]], 7, implicit $frm
  ; CHECK-NEXT:   [[FADD_D2:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D killed [[FADD_D]], killed [[FADD_D1]], 7, implicit $frm
  ; CHECK-NEXT:   $f10_d = COPY [[FADD_D2]]
  ; CHECK-NEXT:   PseudoRET implicit $f10_d
  %t0 = fadd nsz reassoc double %a0, %a1
  %t1 = fadd nsz reassoc double %t0, %a2
  %t2 = fadd nsz reassoc double %t1, %a3
  ret double %t2
}

define double @test_reassoc_fmul1(double %a0, double %a1, double %a2, double %a3) {
  ; CHECK-LABEL: name: test_reassoc_fmul1
  ; CHECK: bb.0 (%ir-block.0):
  ; CHECK-NEXT:   liveins: $f10_d, $f11_d, $f12_d, $f13_d
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:fpr64 = COPY $f13_d
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:fpr64 = COPY $f12_d
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:fpr64 = COPY $f11_d
  ; CHECK-NEXT:   [[COPY3:%[0-9]+]]:fpr64 = COPY $f10_d
  ; CHECK-NEXT:   [[FMUL_D:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FMUL_D [[COPY3]], [[COPY2]], 7, implicit $frm
  ; CHECK-NEXT:   [[FMUL_D1:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FMUL_D [[COPY1]], [[COPY]], 7, implicit $frm
  ; CHECK-NEXT:   [[FMUL_D2:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FMUL_D killed [[FMUL_D]], killed [[FMUL_D1]], 7, implicit $frm
  ; CHECK-NEXT:   $f10_d = COPY [[FMUL_D2]]
  ; CHECK-NEXT:   PseudoRET implicit $f10_d
  %t0 = fmul nsz reassoc double %a0, %a1
  %t1 = fmul nsz reassoc double %t0, %a2
  %t2 = fmul nsz reassoc double %t1, %a3
  ret double %t2
}

; Verify flags intersection
define double @test_reassoc_flags1(double %a0, double %a1, double %a2, double %a3) {
  ; CHECK-LABEL: name: test_reassoc_flags1
  ; CHECK: bb.0 (%ir-block.0):
  ; CHECK-NEXT:   liveins: $f10_d, $f11_d, $f12_d, $f13_d
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:fpr64 = COPY $f13_d
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:fpr64 = COPY $f12_d
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:fpr64 = COPY $f11_d
  ; CHECK-NEXT:   [[COPY3:%[0-9]+]]:fpr64 = COPY $f10_d
  ; CHECK-NEXT:   [[FADD_D:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D [[COPY3]], [[COPY2]], 7, implicit $frm
  ; CHECK-NEXT:   [[FADD_D1:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D [[COPY1]], [[COPY]], 7, implicit $frm
  ; CHECK-NEXT:   [[FADD_D2:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D killed [[FADD_D]], killed [[FADD_D1]], 7, implicit $frm
  ; CHECK-NEXT:   $f10_d = COPY [[FADD_D2]]
  ; CHECK-NEXT:   PseudoRET implicit $f10_d
  %t0 = fadd nsz reassoc double %a0, %a1
  %t1 = fadd contract nsz reassoc double %t0, %a2
  %t2 = fadd nsz reassoc double %t1, %a3
  ret double %t2
}

; Verify flags intersection
define double @test_reassoc_flags2(double %a0, double %a1, double %a2, double %a3) {
  ; CHECK-LABEL: name: test_reassoc_flags2
  ; CHECK: bb.0 (%ir-block.0):
  ; CHECK-NEXT:   liveins: $f10_d, $f11_d, $f12_d, $f13_d
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:fpr64 = COPY $f13_d
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:fpr64 = COPY $f12_d
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:fpr64 = COPY $f11_d
  ; CHECK-NEXT:   [[COPY3:%[0-9]+]]:fpr64 = COPY $f10_d
  ; CHECK-NEXT:   [[FADD_D:%[0-9]+]]:fpr64 = nsz reassoc nofpexcept FADD_D [[COPY3]], [[COPY2]], 7, implicit $frm
  ; CHECK-NEXT:   [[FADD_D1:%[0-9]+]]:fpr64 = nsz contract reassoc nofpexcept FADD_D [[COPY1]], [[COPY]], 7, implicit $frm
  ; CHECK-NEXT:   [[FADD_D2:%[0-9]+]]:fpr64 = nsz contract reassoc nofpexcept FADD_D killed [[FADD_D]], killed [[FADD_D1]], 7, implicit $frm
  ; CHECK-NEXT:   $f10_d = COPY [[FADD_D2]]
  ; CHECK-NEXT:   PseudoRET implicit $f10_d
  %t0 = fadd nsz reassoc double %a0, %a1
  %t1 = fadd contract nsz reassoc double %t0, %a2
  %t2 = fadd contract nsz reassoc double %t1, %a3
  ret double %t2
}

; Verify FRM
define double @test_fmadd(double %a0, double %a1, double %a2) {
  ; CHECK-LABEL: name: test_fmadd
  ; CHECK: bb.0 (%ir-block.0):
  ; CHECK-NEXT:   liveins: $f10_d, $f11_d, $f12_d
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:fpr64 = COPY $f12_d
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:fpr64 = COPY $f11_d
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:fpr64 = COPY $f10_d
  ; CHECK-NEXT:   [[FMUL_D:%[0-9]+]]:fpr64 = contract nofpexcept FMUL_D [[COPY2]], [[COPY1]], 7, implicit $frm
  ; CHECK-NEXT:   [[FMADD_D:%[0-9]+]]:fpr64 = contract nofpexcept FMADD_D [[COPY2]], [[COPY1]], [[COPY]], 7, implicit $frm
  ; CHECK-NEXT:   [[FDIV_D:%[0-9]+]]:fpr64 = nofpexcept FDIV_D killed [[FMADD_D]], [[FMUL_D]], 7, implicit $frm
  ; CHECK-NEXT:   $f10_d = COPY [[FDIV_D]]
  ; CHECK-NEXT:   PseudoRET implicit $f10_d
  %t0 = fmul contract double %a0, %a1
  %t1 = fadd contract double %t0, %a2
  %t2 = fdiv double %t1, %t0
  ret double %t2
}