| Jingyue Wu | 9a92d4f | 2015-07-13 03:28:53 +0000 | [diff] [blame] | 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) |