third_party/LLVM/test/Transforms/LICM/scalar_promote.ll

; RUN: opt < %s -basicaa -licm -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"

@X = global i32 7		; <i32*> [#uses=4]

define void @test1(i32 %i) {
Entry:
	br label %Loop
; CHECK: @test1
; CHECK: Entry:
; CHECK-NEXT:   load i32* @X
; CHECK-NEXT:   br label %Loop


Loop:		; preds = %Loop, %0
	%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ]		; <i32> [#uses=1]
	%x = load i32* @X		; <i32> [#uses=1]
	%x2 = add i32 %x, 1		; <i32> [#uses=1]
	store i32 %x2, i32* @X
	%Next = add i32 %j, 1		; <i32> [#uses=2]
	%cond = icmp eq i32 %Next, 0		; <i1> [#uses=1]
	br i1 %cond, label %Out, label %Loop

Out:	
	ret void
; CHECK: Out:
; CHECK-NEXT:   store i32 %x2, i32* @X
; CHECK-NEXT:   ret void

}

define void @test2(i32 %i) {
Entry:
	br label %Loop
; CHECK: @test2
; CHECK: Entry:
; CHECK-NEXT:    %.promoted = load i32* getelementptr inbounds (i32* @X, i64 1)
; CHECK-NEXT:    br label %Loop

Loop:		; preds = %Loop, %0
	%X1 = getelementptr i32* @X, i64 1		; <i32*> [#uses=1]
	%A = load i32* %X1		; <i32> [#uses=1]
	%V = add i32 %A, 1		; <i32> [#uses=1]
	%X2 = getelementptr i32* @X, i64 1		; <i32*> [#uses=1]
	store i32 %V, i32* %X2
	br i1 false, label %Loop, label %Exit

Exit:		; preds = %Loop
	ret void
; CHECK: Exit:
; CHECK-NEXT:   store i32 %V, i32* getelementptr inbounds (i32* @X, i64 1)
; CHECK-NEXT:   ret void
}



define void @test3(i32 %i) {
; CHECK: @test3
	br label %Loop
Loop:
        ; Should not promote this to a register
	%x = volatile load i32* @X
	%x2 = add i32 %x, 1	
	store i32 %x2, i32* @X
	br i1 true, label %Out, label %Loop
        
; CHECK: Loop:
; CHECK-NEXT: load volatile

Out:		; preds = %Loop
	ret void
}

; PR8041
define void @test4(i8* %x, i8 %n) {
; CHECK: @test4
  %handle1 = alloca i8*
  %handle2 = alloca i8*
  store i8* %x, i8** %handle1
  br label %loop

loop:
  %tmp = getelementptr i8* %x, i64 8
  store i8* %tmp, i8** %handle2
  br label %subloop

subloop:
  %count = phi i8 [ 0, %loop ], [ %nextcount, %subloop ]
  %offsetx2 = load i8** %handle2
  store i8 %n, i8* %offsetx2
  %newoffsetx2 = getelementptr i8* %offsetx2, i64 -1
  store i8* %newoffsetx2, i8** %handle2
  %nextcount = add i8 %count, 1
  %innerexitcond = icmp sge i8 %nextcount, 8
  br i1 %innerexitcond, label %innerexit, label %subloop

; Should have promoted 'handle2' accesses.
; CHECK: subloop:
; CHECK-NEXT: phi i8* [
; CHECK-NEXT: %count = phi i8 [
; CHECK-NEXT: store i8 %n
; CHECK-NOT: store
; CHECK: br i1

innerexit:
  %offsetx1 = load i8** %handle1
  %val = load i8* %offsetx1
  %cond = icmp eq i8 %val, %n
  br i1 %cond, label %exit, label %loop

; Should not have promoted offsetx1 loads.
; CHECK: innerexit:
; CHECK: %val = load i8* %offsetx1
; CHECK: %cond = icmp eq i8 %val, %n
; CHECK: br i1 %cond, label %exit, label %loop

exit:
  ret void
}

define void @test5(i32 %i, i32** noalias %P2) {
Entry:
	br label %Loop
; CHECK: @test5
; CHECK: Entry:
; CHECK-NEXT:   load i32* @X
; CHECK-NEXT:   br label %Loop


Loop:		; preds = %Loop, %0
	%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ]		; <i32> [#uses=1]
	%x = load i32* @X		; <i32> [#uses=1]
	%x2 = add i32 %x, 1		; <i32> [#uses=1]
	store i32 %x2, i32* @X
        
        volatile store i32* @X, i32** %P2
        
	%Next = add i32 %j, 1		; <i32> [#uses=2]
	%cond = icmp eq i32 %Next, 0		; <i1> [#uses=1]
	br i1 %cond, label %Out, label %Loop

Out:	
	ret void
; CHECK: Out:
; CHECK-NEXT:   store i32 %x2, i32* @X
; CHECK-NEXT:   ret void

}