90ba33099c
This patch canonicalizes getelementptr instructions with constant indices to use the `i8` source element type. This makes it easier for optimizations to recognize that two GEPs are identical, because they don't need to see past many different ways to express the same offset. This is a first step towards https://discourse.llvm.org/t/rfc-replacing-getelementptr-with-ptradd/68699. This is limited to constant GEPs only for now, as they have a clear canonical form, while we're not yet sure how exactly to deal with variable indices. The test llvm/test/Transforms/PhaseOrdering/switch_with_geps.ll gives two representative examples of the kind of optimization improvement we expect from this change. In the first test SimplifyCFG can now realize that all switch branches are actually the same. In the second test it can convert it into simple arithmetic. These are representative of common optimization failures we see in Rust. Fixes https://github.com/llvm/llvm-project/issues/69841.
56 lines
3.2 KiB
C++
56 lines
3.2 KiB
C++
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --function-signature --include-generated-funcs --prefix-filecheck-ir-name _
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// RUN: %clang_cc1 -fopenmp -O1 -x c++ -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK
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template <class Function, class... Args>
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void run_task(Function function, Args... args) {
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#pragma omp task untied
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{ function(args...); }
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}
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void bar(int a, float b);
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void foo() {
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int a;
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float b;
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run_task(bar, a, b);
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}
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// CHECK-LABEL: define {{[^@]+}}@_Z3foov
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// CHECK-SAME: () local_unnamed_addr #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[TMP0:%.*]] = tail call i32 @__kmpc_global_thread_num(ptr nonnull @[[GLOB1:[0-9]+]])
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// CHECK-NEXT: [[TMP1:%.*]] = tail call ptr @__kmpc_omp_task_alloc(ptr nonnull @[[GLOB1]], i32 [[TMP0]], i32 0, i64 56, i64 1, ptr nonnull @.omp_task_entry.)
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// CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 40
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// CHECK-NEXT: store ptr @_Z3barif, ptr [[TMP2]], align 8, !tbaa [[TBAA3:![0-9]+]]
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// CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 16
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// CHECK-NEXT: store i32 0, ptr [[TMP3]], align 8, !tbaa [[TBAA12:![0-9]+]]
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// CHECK-NEXT: [[TMP4:%.*]] = tail call i32 @__kmpc_omp_task(ptr nonnull @[[GLOB1]], i32 [[TMP0]], ptr [[TMP1]])
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// CHECK-NEXT: ret void
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//
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//
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// CHECK-LABEL: define {{[^@]+}}@.omp_task_entry.
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// CHECK-SAME: (i32 noundef [[TMP0:%.*]], ptr noalias noundef [[TMP1:%.*]]) #[[ATTR3:[0-9]+]] {
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 16
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// CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META13:![0-9]+]])
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// CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[TMP2]], align 4, !tbaa [[TBAA16:![0-9]+]], !alias.scope [[META13]], !noalias [[META17:![0-9]+]]
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// CHECK-NEXT: switch i32 [[TMP3]], label [[DOTOMP_OUTLINED__EXIT:%.*]] [
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// CHECK-NEXT: i32 0, label [[DOTUNTIED_JMP__I:%.*]]
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// CHECK-NEXT: i32 1, label [[DOTUNTIED_NEXT__I:%.*]]
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// CHECK-NEXT: ]
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// CHECK: .untied.jmp..i:
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// CHECK-NEXT: store i32 1, ptr [[TMP2]], align 4, !tbaa [[TBAA16]], !alias.scope [[META13]], !noalias [[META17]]
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// CHECK-NEXT: [[TMP4:%.*]] = tail call i32 @__kmpc_omp_task(ptr nonnull @[[GLOB1]], i32 [[TMP0]], ptr [[TMP1]]), !noalias [[META13]]
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// CHECK-NEXT: br label [[DOTOMP_OUTLINED__EXIT]]
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// CHECK: .untied.next..i:
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// CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 40
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// CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 52
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// CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 48
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// CHECK-NEXT: [[TMP8:%.*]] = load ptr, ptr [[TMP5]], align 8, !tbaa [[TBAA19:![0-9]+]], !noalias [[META13]]
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// CHECK-NEXT: [[TMP9:%.*]] = load i32, ptr [[TMP7]], align 4, !tbaa [[TBAA16]], !noalias [[META13]]
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// CHECK-NEXT: [[TMP10:%.*]] = load float, ptr [[TMP6]], align 4, !tbaa [[TBAA20:![0-9]+]], !noalias [[META13]]
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// CHECK-NEXT: tail call void [[TMP8]](i32 noundef [[TMP9]], float noundef [[TMP10]]) #[[ATTR2:[0-9]+]], !noalias [[META13]]
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// CHECK-NEXT: br label [[DOTOMP_OUTLINED__EXIT]]
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// CHECK: .omp_outlined..exit:
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// CHECK-NEXT: ret i32 0
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//
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