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1; RUN: opt < %s -loop-reduce -S -mtriple=x86_64-unknown-unknown | FileCheck %s2;3; Test LSR's OptimizeShadowIV. Handle a floating-point IV with a4; nonzero initial value.5; rdar://97865366 7; Provide legal integer types.8target datalayout = "n8:16:32:64"9 10 11; First, make sure LSR doesn't crash on an empty IVUsers list.12; CHECK-LABEL: @dummyIV(13; CHECK-NOT: phi14; CHECK-NOT: sitofp15; CHECK: br16define void @dummyIV() nounwind {17entry:18 br label %loop19 20loop:21 %i.01 = phi i32 [ -39, %entry ], [ %inc, %loop ]22 %conv = sitofp i32 %i.01 to double23 %inc = add nsw i32 %i.01, 124 br i1 true, label %loop, label %for.end25 26for.end:27 unreachable28}29 30; Now check that the computed double constant is correct.31; CHECK-LABEL: @doubleIV(32; CHECK: phi double [ -3.900000e+01, %entry ]33; CHECK: br34define void @doubleIV() nounwind {35entry:36 br label %loop37 38loop:39 %i.01 = phi i32 [ -39, %entry ], [ %inc, %loop ]40 %conv = sitofp i32 %i.01 to double41 %div = fdiv double %conv, 4.000000e+0142 %inc = add nsw i32 %i.01, 143 br i1 false, label %loop, label %for.end44 45for.end:46 unreachable47}48