| 1 | // REQUIRES: hexagon-registered-target |
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| 2 | // RUN: %clang_cc1 -emit-llvm -O2 -o - -triple hexagon-unknown-elf %s | FileCheck %s |
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| 3 | // This unit test validates that the store to "dst" variable needs to be eliminated. |
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| 4 | |
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| 5 | // CHECK: @brev_store_elimination_test1 |
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| 6 | // CHECK: llvm.hexagon.L2.loadri.pbr |
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| 7 | // CHECK-NOT: store |
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| 8 | |
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| 9 | int *brev_store_elimination_test1(int *ptr, int mod) { |
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| 10 | int dst = 100; |
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| 11 | return __builtin_brev_ldw(ptr, &dst, mod); |
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| 12 | } |
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| 13 | |
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| 14 | // CHECK: @brev_store_elimination_test2 |
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| 15 | // CHECK: llvm.hexagon.L2.loadri.pbr |
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| 16 | // CHECK-NOT: store |
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| 17 | extern int add(int a); |
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| 18 | int brev_store_elimination_test2(int *ptr, int mod) { |
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| 19 | int dst = 100; |
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| 20 | __builtin_brev_ldw(ptr, &dst, mod); |
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| 21 | return add(dst); |
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| 22 | } |
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| 23 | |
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| 24 | // CHECK: @brev_store_elimination_test3 |
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| 25 | // CHECK: llvm.hexagon.L2.loadri.pbr |
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| 26 | // CHECK-NOT: store |
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| 27 | int brev_store_elimination_test3(int *ptr, int mod, int inc) { |
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| 28 | int dst = 100; |
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| 29 | for (int i = 0; i < inc; ++i) { |
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| 30 | __builtin_brev_ldw(ptr, &dst, mod); |
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| 31 | dst = add(dst); |
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| 32 | } |
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| 33 | return dst; |
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| 34 | } |
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| 35 | |
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| 36 | // brev_store_elimination_test4 validates the fact that we are not deleting the |
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| 37 | // stores if the value is passed by reference later. |
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| 38 | // CHECK: @brev_store_elimination_test4 |
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| 39 | // CHECK: llvm.hexagon.L2.loadri.pbr |
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| 40 | // CHECK: store |
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| 41 | extern int sub(int *a); |
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| 42 | int brev_store_elimination_test4(int *ptr, int mod) { |
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| 43 | int dst = 100; |
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| 44 | __builtin_brev_ldw(ptr, &dst, mod); |
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| 45 | return sub(&dst); |
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| 46 | } |
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| 47 | |
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