src/third_party/llvm-project/llvm/test/Transforms/PhaseOrdering/PR6627.ll

; RUN: opt -O3 -S < %s | FileCheck %s
; XFAIL: *

declare i32 @doo(...)

; PR6627 - This whole nasty sequence should be flattened down to a single
; 32-bit comparison.
define void @test2(i8* %arrayidx) nounwind ssp {
entry:
  %xx = bitcast i8* %arrayidx to i32*
  %x1 = load i32, i32* %xx, align 4
  %tmp = trunc i32 %x1 to i8
  %conv = zext i8 %tmp to i32
  %cmp = icmp eq i32 %conv, 127
  br i1 %cmp, label %land.lhs.true, label %if.end

land.lhs.true:                                    ; preds = %entry
  %arrayidx4 = getelementptr inbounds i8, i8* %arrayidx, i64 1
  %tmp5 = load i8, i8* %arrayidx4, align 1
  %conv6 = zext i8 %tmp5 to i32
  %cmp7 = icmp eq i32 %conv6, 69
  br i1 %cmp7, label %land.lhs.true9, label %if.end

land.lhs.true9:                                   ; preds = %land.lhs.true
  %arrayidx12 = getelementptr inbounds i8, i8* %arrayidx, i64 2
  %tmp13 = load i8, i8* %arrayidx12, align 1
  %conv14 = zext i8 %tmp13 to i32
  %cmp15 = icmp eq i32 %conv14, 76
  br i1 %cmp15, label %land.lhs.true17, label %if.end

land.lhs.true17:                                  ; preds = %land.lhs.true9
  %arrayidx20 = getelementptr inbounds i8, i8* %arrayidx, i64 3
  %tmp21 = load i8, i8* %arrayidx20, align 1
  %conv22 = zext i8 %tmp21 to i32
  %cmp23 = icmp eq i32 %conv22, 70
  br i1 %cmp23, label %if.then, label %if.end

if.then:                                          ; preds = %land.lhs.true17
  %call25 = call i32 (...) @doo()
  br label %if.end

if.end:
  ret void

; CHECK-LABEL: @test2(
; CHECK: %x1 = load i32, i32* %xx, align 4
; CHECK-NEXT: icmp eq i32 %x1, 1179403647
; CHECK-NEXT: br i1 {{.*}}, label %if.then, label %if.end 
}

; PR6627 - This should all be flattened down to one compare.  This is the same
; as test2, except that the initial load is done as an i8 instead of i32, thus
; requiring widening.
define void @test2a(i8* %arrayidx) nounwind ssp {
entry:
  %x1 = load i8, i8* %arrayidx, align 4
  %conv = zext i8 %x1 to i32
  %cmp = icmp eq i32 %conv, 127
  br i1 %cmp, label %land.lhs.true, label %if.end

land.lhs.true:                                    ; preds = %entry
  %arrayidx4 = getelementptr inbounds i8, i8* %arrayidx, i64 1
  %tmp5 = load i8, i8* %arrayidx4, align 1
  %conv6 = zext i8 %tmp5 to i32
  %cmp7 = icmp eq i32 %conv6, 69
  br i1 %cmp7, label %land.lhs.true9, label %if.end

land.lhs.true9:                                   ; preds = %land.lhs.true
  %arrayidx12 = getelementptr inbounds i8, i8* %arrayidx, i64 2
  %tmp13 = load i8, i8* %arrayidx12, align 1
  %conv14 = zext i8 %tmp13 to i32
  %cmp15 = icmp eq i32 %conv14, 76
  br i1 %cmp15, label %land.lhs.true17, label %if.end

land.lhs.true17:                                  ; preds = %land.lhs.true9
  %arrayidx20 = getelementptr inbounds i8, i8* %arrayidx, i64 3
  %tmp21 = load i8, i8* %arrayidx20, align 1
  %conv22 = zext i8 %tmp21 to i32
  %cmp23 = icmp eq i32 %conv22, 70
  br i1 %cmp23, label %if.then, label %if.end

if.then:                                          ; preds = %land.lhs.true17
  %call25 = call i32 (...) @doo()
  br label %if.end

if.end:
  ret void

; CHECK-LABEL: @test2a(
; CHECK: %x1 = load i32, i32* {{.*}}, align 4
; CHECK-NEXT: icmp eq i32 %x1, 1179403647
; CHECK-NEXT: br i1 {{.*}}, label %if.then, label %if.end 
}