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llvm/llvm/test/Transforms/HardwareLoops/ARM/do-rem.ll 

; RUN: opt -mtriple=thumbv8.1m.main-none-none-eabi -passes=hardware-loops %s -S -o - | FileCheck %s

@g = common local_unnamed_addr global ptr null, align 4

; CHECK-LABEL: do_with_i32_urem
; CHECK: entry:
; CHECK: [[TEST:%[^ ]+]] = call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %n)
; CHECK: [[TEST1:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 1
; CHECK: [[TEST0:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 0
; CHECK: br i1 [[TEST1]], label %while.body.preheader, label %while.end

; CHECK: while.body.preheader:
; CHECK-NEXT: br label %while.body

; CHECK: while.body:
; CHECK: [[REM:%[^ ]+]] = phi i32 [ [[TEST0]], %while.body.preheader ], [ [[LOOP_DEC:%[^ ]+]], %while.body ]
; CHECK: [[LOOP_DEC]] = call i32 @llvm.loop.decrement.reg.i32(i32 [[REM]], i32 1)
; CHECK: [[CMP:%[^ ]+]] = icmp ne i32 [[LOOP_DEC]], 0
; CHECK: br i1 [[CMP]], label %while.body, label %while.end.loopexit

define i32 @do_with_i32_urem(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %rem = urem i32 %i.09, 5
  %add = add i32 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i32 %res.0.lcssa
}

; CHECK-LABEL: do_with_i32_srem
; CHECK: entry:
; CHECK: [[TEST:%[^ ]+]] = call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %n)
; CHECK: [[TEST1:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 1
; CHECK: [[TEST0:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 0
; CHECK: br i1 [[TEST1]], label %while.body.preheader, label %while.end

; CHECK: while.body.preheader:
; CHECK-NEXT: br label %while.body

; CHECK: while.body:
; CHECK: [[REM:%[^ ]+]] = phi i32 [ [[TEST0]], %while.body.preheader ], [ [[LOOP_DEC:%[^ ]+]], %while.body ]
; CHECK: [[LOOP_DEC]] = call i32 @llvm.loop.decrement.reg.i32(i32 [[REM]], i32 1)
; CHECK: [[CMP:%[^ ]+]] = icmp ne i32 [[LOOP_DEC]], 0
; CHECK: br i1 [[CMP]], label %while.body, label %while.end.loopexit

define i32 @do_with_i32_srem(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %rem = srem i32 %i.09, 5
  %add = sub i32 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i32 %res.0.lcssa
}

; CHECK-LABEL: do_with_i32_udiv
; CHECK: entry:
; CHECK: [[TEST:%[^ ]+]] = call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %n)
; CHECK: [[TEST1:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 1
; CHECK: [[TEST0:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 0
; CHECK: br i1 [[TEST1]], label %while.body.preheader, label %while.end

; CHECK: while.body.preheader:
; CHECK-NEXT: br label %while.body

; CHECK: while.body:
; CHECK: [[REM:%[^ ]+]] = phi i32 [ [[TEST0]], %while.body.preheader ], [ [[LOOP_DEC:%[^ ]+]], %while.body ]
; CHECK: [[LOOP_DEC]] = call i32 @llvm.loop.decrement.reg.i32(i32 [[REM]], i32 1)
; CHECK: [[CMP:%[^ ]+]] = icmp ne i32 [[LOOP_DEC]], 0
; CHECK: br i1 [[CMP]], label %while.body, label %while.end.loopexit

define i32 @do_with_i32_udiv(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %rem = udiv i32 %i.09, 5
  %add = add i32 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i32 %res.0.lcssa
}

; CHECK-LABEL: do_with_i32_sdiv
; CHECK: entry:
; CHECK: [[TEST:%[^ ]+]] = call { i32, i1 } @llvm.test.start.loop.iterations.i32(i32 %n)
; CHECK: [[TEST1:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 1
; CHECK: [[TEST0:%[^ ]+]] = extractvalue { i32, i1 } [[TEST]], 0
; CHECK: br i1 [[TEST1]], label %while.body.preheader, label %while.end

; CHECK: while.body.preheader:
; CHECK-NEXT: br label %while.body

; CHECK: while.body:
; CHECK: [[REM:%[^ ]+]] = phi i32 [ [[TEST0]], %while.body.preheader ], [ [[LOOP_DEC:%[^ ]+]], %while.body ]
; CHECK: [[LOOP_DEC]] = call i32 @llvm.loop.decrement.reg.i32(i32 [[REM]], i32 1)
; CHECK: [[CMP:%[^ ]+]] = icmp ne i32 [[LOOP_DEC]], 0
; CHECK: br i1 [[CMP]], label %while.body, label %while.end.loopexit

define i32 @do_with_i32_sdiv(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %rem = sdiv i32 %i.09, 5
  %add = sub i32 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i32 %res.0.lcssa
}

; CHECK-LABEL: do_with_i64_urem
; CHECK-NOT: llvm.{{.*}}.loop.iterations
; CHECK-NOT: llvm.loop.decrement
define i64 @do_with_i64_urem(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i64 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %conv = zext i32 %i.09 to i64
  %rem = urem i64 %conv, 5
  %add = add i64 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i64 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i64 %res.0.lcssa
}

; CHECK-LABEL: do_with_i64_srem
; CHECK-NOT: llvm.{{.*}}.loop.iterations
; CHECK-NOT: llvm.loop.decrement
define i64 @do_with_i64_srem(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i64 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %conv = zext i32 %i.09 to i64
  %rem = srem i64 %conv, 5
  %add = sub i64 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i64 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i64 %res.0.lcssa
}

; CHECK-LABEL: do_with_i64_udiv
; CHECK-NOT: llvm.{{.*}}.loop.iterations
; CHECK-NOT: llvm.loop.decrement
define i64 @do_with_i64_udiv(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i64 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %conv = zext i32 %i.09 to i64
  %rem = udiv i64 %conv, 5
  %add = add i64 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i64 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i64 %res.0.lcssa
}

; CHECK-LABEL: do_with_i64_sdiv
; CHECK-NOT: call void @llvm.{{.*}}.loop.iterations
; CHECK-NOT: call i32 @llvm.loop.decrement
define i64 @do_with_i64_sdiv(i32 %n) {
entry:
  %cmp7 = icmp eq i32 %n, 0
  br i1 %cmp7, label %while.end, label %while.body.preheader

while.body.preheader:
  br label %while.body

while.body:
  %i.09 = phi i32 [ %inc1, %while.body ], [ 0, %while.body.preheader ]
  %res.08 = phi i64 [ %add, %while.body ], [ 0, %while.body.preheader ]
  %conv = zext i32 %i.09 to i64
  %rem = sdiv i64 %conv, 5
  %add = sub i64 %rem, %res.08
  %inc1 = add nuw i32 %i.09, 1
  %exitcond = icmp eq i32 %inc1, %n
  br i1 %exitcond, label %while.end.loopexit, label %while.body

while.end.loopexit:
  br label %while.end

while.end:
  %res.0.lcssa = phi i64 [ 0, %entry ], [ %add, %while.end.loopexit ]
  ret i64 %res.0.lcssa
}