| ; RUN: opt < %s -loop-reduce -S | FileCheck %s |
| |
| target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64" |
| |
| ; for (int i = 0; i < n; ++i) { |
| ; use(i * 5 + 3); |
| ; // i * a + b is ephemeral and shouldn't be promoted by LSR |
| ; __builtin_assume(i * a + b >= 0); |
| ; } |
| define void @ephemeral(i32 %a, i32 %b, i32 %n) { |
| ; CHECK-LABEL: @ephemeral( |
| entry: |
| br label %loop |
| |
| loop: |
| %i = phi i32 [ 0, %entry ], [ %inc, %loop ] |
| ; Only i and i * 5 + 3 should be indvars, not i * a + b. |
| ; CHECK: phi i32 |
| ; CHECK: phi i32 |
| ; CHECK-NOT: phi i32 |
| %inc = add nsw i32 %i, 1 |
| %exitcond = icmp eq i32 %inc, %n |
| |
| %0 = mul nsw i32 %i, 5 |
| %1 = add nsw i32 %0, 3 |
| call void @use(i32 %1) |
| |
| %2 = mul nsw i32 %i, %a |
| %3 = add nsw i32 %2, %b |
| %4 = icmp sgt i32 %3, -1 |
| call void @llvm.assume(i1 %4) |
| |
| br i1 %exitcond, label %exit, label %loop |
| |
| exit: |
| ret void |
| } |
| |
| declare void @use(i32) |
| |
| declare void @llvm.assume(i1) |
