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1; RUN: opt < %s -loop-reduce -S | FileCheck %s2 3target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"4 5; for (int i = 0; i < n; ++i) {6; use(i * 5 + 3);7; // i * a + b is ephemeral and shouldn't be promoted by LSR8; __builtin_assume(i * a + b >= 0);9; }10define void @ephemeral(i32 %a, i32 %b, i32 %n) {11; CHECK-LABEL: @ephemeral(12entry:13 br label %loop14 15loop:16 %i = phi i32 [ 0, %entry ], [ %inc, %loop ]17 ; Only i and i * 5 + 3 should be indvars, not i * a + b.18; CHECK: phi i3219; CHECK: phi i3220; CHECK-NOT: phi i3221 %inc = add nsw i32 %i, 122 %exitcond = icmp eq i32 %inc, %n23 24 %0 = mul nsw i32 %i, 525 %1 = add nsw i32 %0, 326 call void @use(i32 %1)27 28 %2 = mul nsw i32 %i, %a29 %3 = add nsw i32 %2, %b30 %4 = icmp sgt i32 %3, -131 call void @llvm.assume(i1 %4)32 33 br i1 %exitcond, label %exit, label %loop34 35exit:36 ret void37}38 39declare void @use(i32)40 41declare void @llvm.assume(i1)42