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ac73b73c16
Since C++11, the C++ standard has a forward progress guarantee [intro.progress], so all such functions must have the `mustprogress` requirement. In addition, from C11 and onwards, loops without a non-zero constant conditional or no conditional are also required to make progress (C11 6.8.5p6). This patch implements these attribute deductions so they can be used by the optimization passes. Differential Revision: https://reviews.llvm.org/D86841
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - %s | FileCheck %s
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// Check that passing -fno-unroll-loops does not impact the decision made using pragmas.
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// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - -O1 -disable-llvm-optzns -fno-unroll-loops %s | FileCheck %s
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// Verify while loop is recognized after unroll pragma.
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void while_test(int *List, int Length) {
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// CHECK: define {{.*}} @_Z10while_test
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int i = 0;
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#pragma unroll
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while (i < Length) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
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List[i] = i * 2;
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i++;
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}
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}
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// Verify do loop is recognized after multi-option pragma clang loop directive.
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void do_test(int *List, int Length) {
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// CHECK: define {{.*}} @_Z7do_test
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int i = 0;
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#pragma nounroll
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do {
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// CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_2:.*]]
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List[i] = i * 2;
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i++;
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} while (i < Length);
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}
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// Verify for loop is recognized after unroll pragma.
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void for_test(int *List, int Length) {
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// CHECK: define {{.*}} @_Z8for_test
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#pragma unroll 8
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for (int i = 0; i < Length; i++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_3:.*]]
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List[i] = i * 2;
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}
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}
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// Verify c++11 for range loop is recognized after unroll pragma.
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void for_range_test() {
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// CHECK: define {{.*}} @_Z14for_range_test
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double List[100];
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#pragma unroll(4)
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for (int i : List) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_4:.*]]
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List[i] = i;
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}
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}
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#define UNROLLCOUNT 8
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// Verify defines are correctly resolved in unroll pragmas.
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void for_define_test(int *List, int Length, int Value) {
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// CHECK: define {{.*}} @_Z15for_define_test
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#pragma unroll(UNROLLCOUNT)
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for (int i = 0; i < Length; i++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_5:.*]]
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List[i] = i * Value;
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}
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}
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// Verify metadata is generated when template is used.
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template <typename A>
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void for_template_test(A *List, int Length, A Value) {
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// CHECK: define {{.*}} @_Z13template_test
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#pragma unroll 8
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for (int i = 0; i < Length; i++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_6:.*]]
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List[i] = i * Value;
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}
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}
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// Verify define is resolved correctly when template is used.
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template <typename A>
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void for_template_define_test(A *List, int Length, A Value) {
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// CHECK: define {{.*}} @_Z24for_template_define_test
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#pragma unroll(UNROLLCOUNT)
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for (int i = 0; i < Length; i++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_7:.*]]
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List[i] = i * Value;
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}
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}
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#undef UNROLLCOUNT
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// Use templates defined above. Test verifies metadata is generated correctly.
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void template_test(double *List, int Length) {
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double Value = 10;
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for_template_test<double>(List, Length, Value);
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for_template_define_test<double>(List, Length, Value);
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}
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// CHECK: ![[LOOP_1]] = distinct !{![[LOOP_1]], [[MP:![0-9]+]], ![[UNROLL_ENABLE:.*]]}
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// CHECK: ![[UNROLL_ENABLE]] = !{!"llvm.loop.unroll.enable"}
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// CHECK: ![[LOOP_2]] = distinct !{![[LOOP_2:.*]], ![[UNROLL_DISABLE:.*]]}
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// CHECK: ![[UNROLL_DISABLE]] = !{!"llvm.loop.unroll.disable"}
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// CHECK: ![[LOOP_3]] = distinct !{![[LOOP_3]], [[MP]], ![[UNROLL_8:.*]]}
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// CHECK: ![[UNROLL_8]] = !{!"llvm.loop.unroll.count", i32 8}
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// CHECK: ![[LOOP_4]] = distinct !{![[LOOP_4]], ![[UNROLL_4:.*]]}
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// CHECK: ![[UNROLL_4]] = !{!"llvm.loop.unroll.count", i32 4}
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// CHECK: ![[LOOP_5]] = distinct !{![[LOOP_5]], ![[UNROLL_8:.*]]}
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// CHECK: ![[LOOP_6]] = distinct !{![[LOOP_6]], ![[UNROLL_8:.*]]}
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// CHECK: ![[LOOP_7]] = distinct !{![[LOOP_7]], ![[UNROLL_8:.*]]}
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