Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/PhaseOrdering/basic.ll

@@ -0,0 +1,51 @@
+; RUN: opt -O3 -S < %s | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-macosx10.6.7"
+
+declare i8* @malloc(i64)
+declare void @free(i8*)
+
+
+; PR2338
+define void @test1() nounwind ssp {
+  %retval = alloca i32, align 4
+  %i = alloca i8*, align 8
+  %call = call i8* @malloc(i64 1)
+  store i8* %call, i8** %i, align 8
+  %tmp = load i8*, i8** %i, align 8
+  store i8 1, i8* %tmp
+  %tmp1 = load i8*, i8** %i, align 8
+  call void @free(i8* %tmp1)
+  ret void
+
+; CHECK-LABEL: @test1(
+; CHECK-NEXT: ret void
+}
+
+; This function exposes a phase ordering problem when InstCombine is
+; turning %add into a bitmask, making it difficult to spot a 0 return value.
+;
+; It it also important that %add is expressed as a multiple of %div so scalar
+; evolution can recognize it.
+define i32 @test2(i32 %a, i32* %p) nounwind uwtable ssp {
+entry:
+  %div = udiv i32 %a, 4
+  %arrayidx = getelementptr inbounds i32, i32* %p, i64 0
+  store i32 %div, i32* %arrayidx, align 4
+  %add = add i32 %div, %div
+  %arrayidx1 = getelementptr inbounds i32, i32* %p, i64 1
+  store i32 %add, i32* %arrayidx1, align 4
+  %arrayidx2 = getelementptr inbounds i32, i32* %p, i64 1
+  %0 = load i32, i32* %arrayidx2, align 4
+  %arrayidx3 = getelementptr inbounds i32, i32* %p, i64 0
+  %1 = load i32, i32* %arrayidx3, align 4
+  %mul = mul i32 2, %1
+  %sub = sub i32 %0, %mul
+  ret i32 %sub
+
+; CHECK-LABEL: @test2(
+; CHECK: %div = lshr i32 %a, 2
+; CHECK: %add = shl nuw nsw i32 %div, 1
+; CHECK: ret i32 0
+}