test/Transforms/GVN/rle-must-alias.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=gvn -S | FileCheck %s

; GVN should eliminate the fully redundant %9 GEP which
; allows DEAD to be removed.  This is PR3198.

; The %7 and %4 loads combine to make %DEAD unneeded.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin7"
@H = common global [100 x i32] zeroinitializer, align 32		; <ptr> [#uses=3]
@G = common global i32 0		; <ptr> [#uses=2]

define i32 @test(i32 %i) nounwind {
; CHECK-LABEL: @test(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = tail call i32 (...) @foo() #[[ATTR0:[0-9]+]]
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i32 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[TMP1]], label [[BB1:%.*]], label [[BB:%.*]]
; CHECK:       bb:
; CHECK-NEXT:    [[TMP2:%.*]] = tail call i32 (...) @bar() #[[ATTR0]]
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr [100 x i32], ptr @H, i32 0, i32 [[I:%.*]]
; CHECK-NEXT:    [[TMP4:%.*]] = load i32, ptr [[TMP3]], align 4
; CHECK-NEXT:    store i32 [[TMP4]], ptr @G, align 4
; CHECK-NEXT:    br label [[BB3:%.*]]
; CHECK:       bb1:
; CHECK-NEXT:    [[TMP5:%.*]] = tail call i32 (...) @baz() #[[ATTR0]]
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr [100 x i32], ptr @H, i32 0, i32 [[I]]
; CHECK-NEXT:    [[TMP7:%.*]] = load i32, ptr [[TMP6]], align 4
; CHECK-NEXT:    store i32 [[TMP7]], ptr @G, align 4
; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i32 [[TMP7]], 0
; CHECK-NEXT:    br i1 [[TMP8]], label [[BB3]], label [[BB4:%.*]]
; CHECK:       bb3:
; CHECK-NEXT:    [[DEAD:%.*]] = phi i32 [ 0, [[BB1]] ], [ [[TMP4]], [[BB]] ]
; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr [100 x i32], ptr @H, i32 0, i32 [[I]]
; CHECK-NEXT:    ret i32 [[DEAD]]
; CHECK:       bb4:
; CHECK-NEXT:    ret i32 0
;
entry:
  %0 = tail call i32 (...) @foo() nounwind		; <i32> [#uses=1]
  %1 = icmp eq i32 %0, 0		; <i1> [#uses=1]
  br i1 %1, label %bb1, label %bb

bb:		; preds = %entry
  %2 = tail call i32 (...) @bar() nounwind		; <i32> [#uses=0]
  %3 = getelementptr [100 x i32], ptr @H, i32 0, i32 %i		; <ptr> [#uses=1]
  %4 = load i32, ptr %3, align 4		; <i32> [#uses=1]
  store i32 %4, ptr @G, align 4
  br label %bb3

bb1:		; preds = %entry
  %5 = tail call i32 (...) @baz() nounwind		; <i32> [#uses=0]
  %6 = getelementptr [100 x i32], ptr @H, i32 0, i32 %i		; <ptr> [#uses=1]
  %7 = load i32, ptr %6, align 4		; <i32> [#uses=2]
  store i32 %7, ptr @G, align 4
  %8 = icmp eq i32 %7, 0		; <i1> [#uses=1]
  br i1 %8, label %bb3, label %bb4

bb3:		; preds = %bb1, %bb
  %9 = getelementptr [100 x i32], ptr @H, i32 0, i32 %i		; <ptr> [#uses=1]
  %DEAD = load i32, ptr %9, align 4		; <i32> [#uses=1]
  ret i32 %DEAD

bb4:		; preds = %bb1
  ret i32 0
}

declare i32 @foo(...)

declare i32 @bar(...)

declare i32 @baz(...)