Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/LoopIdiom/unsafe.ll

@@ -1,55 +0,0 @@
-; RUN: opt -S < %s -loop-idiom | FileCheck %s
-; CHECK-NOT: memset
-; check that memset is not generated (for stores) because that will result
-; in udiv hoisted out of the loop by the SCEV Expander
-; TODO: ideally we should be able to generate memset
-; if SCEV expander is taught to generate the dependencies
-; at the right point.
-
-@a = global i32 0, align 4
-@b = global i32 0, align 4
-@c = external local_unnamed_addr global [1 x i8], align 1
-
-define void @e() local_unnamed_addr {
-entry:
-  %d0 = load i32, i32* @a, align 4
-  %d1 = load i32, i32* @b, align 4
-  br label %for.cond1thread-pre-split
-
-for.cond1thread-pre-split:                        ; preds = %for.body5, %entry
-  %div = udiv i32 %d0, %d1
-  br label %for.body5
-
-for.body5:                                        ; preds = %for.body5, %for.cond1thread-pre-split
-  %indvars.iv = phi i64 [ 0, %for.cond1thread-pre-split ], [ %indvars.iv.next, %for.body5 ]
-  %divx = sext i32 %div to i64
-  %0 = add nsw i64 %divx, %indvars.iv
-  %arrayidx = getelementptr inbounds [1 x i8], [1 x i8]* @c, i64 0, i64 %0
-  store i8 0, i8* %arrayidx, align 1
-  %indvars.iv.next = add nsw i64 %indvars.iv, 1
-  %1 = trunc i64 %indvars.iv.next to i32
-  %tobool4 = icmp eq i32 %1, 0
-  br i1 %tobool4, label %for.cond1thread-pre-split, label %for.body5
-}
-
-; The loop's trip count is depending on an unsafe operation
-; udiv. SCEV expander hoists it out of the loop, so loop-idiom
-; should check that the memset is not generated in this case.
-define void @f(i32 %a, i32 %b, i8* nocapture %x) local_unnamed_addr {
-entry:
-  br label %for.body
-
-for.body:                                         ; preds = %for.body6, %entry
-  %div = udiv i32 %a, %b
-  %conv = zext i32 %div to i64
-  br label %for.body6
-
-for.body6:                                        ; preds = %for.body6, %for.body
-  %i.09 = phi i64 [ %inc, %for.body6 ], [ 0, %for.body ]
-  %arrayidx = getelementptr inbounds i8, i8* %x, i64 %i.09
-  store i8 0, i8* %arrayidx, align 1
-  %inc = add nuw nsw i64 %i.09, 1
-  %cmp3 = icmp slt i64 %inc, %conv
-  br i1 %cmp3, label %for.body6, label %for.body
-}
-