Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/SimplifyCFG/pr33605.ll

@@ -1,64 +0,0 @@
-; RUN: opt < %s -simplifycfg -S | FileCheck %s
-
-; Skip simplifying unconditional branches from empty blocks in simplifyCFG,
-; when it can destroy canonical loop structure.
-
-; void foo();
-; bool test(int a, int b, int *c) {
-;   bool changed = false;
-;   for (unsigned int i = 2; i--;) {
-;     int r = a | b;
-;     if ( r != c[i]) {
-;       c[i] = r;
-;       foo();
-;       changed = true;
-;     }
-;   }
-;   return changed;
-; }
-
-; CHECK-LABEL: @test(
-; CHECK: for.cond:
-; CHECK-NEXT: %i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ]
-; CHECK: for.body:
-; CHECK: br i1 %cmp, label %if.end, label %if.then
-; CHECK-NOT: br i1 %cmp, label %for.cond, label %if.then
-; CHECK: if.then:
-; CHECK: br label %if.end
-; CHECK-NOT: br label %for.cond
-; CHECK: if.end:
-; CHECK br label %for.cond
-define i1 @test(i32 %a, i32 %b, i32* %c) {
-entry:
-  br label %for.cond
-
-for.cond:                                         ; preds = %if.end, %entry
-  %i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ]
-  %changed.0.off0 = phi i1 [ false, %entry ], [ %changed.1.off0, %if.end ]
-  %dec = add nsw i32 %i.0, -1
-  %tobool = icmp eq i32 %i.0, 0
-  br i1 %tobool, label %for.cond.cleanup, label %for.body
-
-for.cond.cleanup:                                 ; preds = %for.cond
-  %changed.0.off0.lcssa = phi i1 [ %changed.0.off0, %for.cond ]
-  ret i1 %changed.0.off0.lcssa
-
-for.body:                                         ; preds = %for.cond
-  %or = or i32 %a, %b
-  %idxprom = sext i32 %dec to i64
-  %arrayidx = getelementptr inbounds i32, i32* %c, i64 %idxprom
-  %0 = load i32, i32* %arrayidx, align 4
-  %cmp = icmp eq i32 %or, %0
-  br i1 %cmp, label %if.end, label %if.then
-
-if.then:                                          ; preds = %for.body
-  store i32 %or, i32* %arrayidx, align 4
-  call void @foo()
-  br label %if.end
-
-if.end:                                           ; preds = %for.body, %if.then
-  %changed.1.off0 = phi i1 [ true, %if.then ], [ %changed.0.off0, %for.body ]
-  br label %for.cond
-}
-
-declare void @foo()