1; RUN: opt < %s -loop-reduce -S | FileCheck %s 2 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 LSR 8; __builtin_assume(i * a + b >= 0); 9; } 10define void @ephemeral(i32 %a, i32 %b, i32 %n) { 11; CHECK-LABEL: @ephemeral( 12entry: 13 br label %loop 14 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 i32 19; CHECK: phi i32 20; CHECK-NOT: phi i32 21 %inc = add nsw i32 %i, 1 22 %exitcond = icmp eq i32 %inc, %n 23 24 %0 = mul nsw i32 %i, 5 25 %1 = add nsw i32 %0, 3 26 call void @use(i32 %1) 27 28 %2 = mul nsw i32 %i, %a 29 %3 = add nsw i32 %2, %b 30 %4 = icmp sgt i32 %3, -1 31 call void @llvm.assume(i1 %4) 32 33 br i1 %exitcond, label %exit, label %loop 34 35exit: 36 ret void 37} 38 39declare void @use(i32) 40 41declare void @llvm.assume(i1) 42