1 ; RUN: opt < %s -loop-reduce -S | FileCheck %s 2 3 target 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 ; } 10 define void @ephemeral(i32 %a, i32 %b, i32 %n) { 11 ; CHECK-LABEL: @ephemeral( 12 entry: 13 br label %loop 14 15 loop: 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 35 exit: 36 ret void 37 } 38 39 declare void @use(i32) 40 41 declare void @llvm.assume(i1) 42
