| ; REQUIRES: asserts |
| |
| ; RUN: opt -mtriple arm64-linux -passes=loop-vectorize -mattr=+sve -debug-only=loop-vectorize -disable-output <%s 2>&1 | FileCheck %s |
| |
| ; Invariant register usage calculation should take into account if the |
| ; invariant would be used in widened instructions. Only in such cases, a vector |
| ; register would be required for holding the invariant. For all other cases |
| ; such as below(where usage of %0 in loop doesnt require vector register), a |
| ; general purpose register suffices. |
| ; Check that below test doesn't crash while calculating register usage for |
| ; invariant %0 |
| |
| @string = internal unnamed_addr constant [5 x i8] c"abcd\00", align 1 |
| define void @get_invariant_reg_usage(ptr %z) { |
| ; CHECK: LV: Checking a loop in 'get_invariant_reg_usage' |
| ; CHECK: LV(REG): VF = vscale x 16 |
| ; CHECK-NEXT: LV(REG): Found max usage: 1 item |
| ; CHECK-NEXT: LV(REG): RegisterClass: Generic::ScalarRC, 3 registers |
| ; CHECK-NEXT: LV(REG): Found invariant usage: 2 item |
| ; CHECK-NEXT: LV(REG): RegisterClass: Generic::ScalarRC, 2 registers |
| ; CHECK-NEXT: LV(REG): RegisterClass: Generic::VectorRC, 8 registers |
| |
| L.entry: |
| %0 = load i128, ptr %z, align 16 |
| %1 = icmp slt i128 %0, 1 |
| %a = getelementptr i8, ptr %z, i64 1 |
| br i1 %1, label %return, label %loopbody |
| |
| loopbody: ;preds = %L.entry, %loopbody |
| %b = phi ptr [ %2, %loopbody ], [ @string, %L.entry ] |
| %len_input = phi i128 [ %len, %loopbody ], [ %0, %L.entry ] |
| %len = add nsw i128 %len_input, -1 |
| %2 = getelementptr i8, ptr %b, i64 1 |
| %3 = load i8, ptr %b, align 1 |
| store i8 %3, ptr %a, align 4 |
| %.not = icmp eq i128 %len, 0 |
| br i1 %.not, label %return, label %loopbody |
| |
| return: ;preds = %loopexit, %L.entry |
| ret void |
| } |