derek.holloway
7502bf64a4
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51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++23 %s -emit-llvm -o - | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++23 -fno-assumptions %s -emit-llvm -o - | FileCheck %s --check-prefix=DISABLED
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// DISABLED-NOT: @llvm.assume
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bool f();
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template <typename T>
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void f2() {
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[[assume(sizeof(T) == sizeof(int))]];
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}
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// CHECK: @_Z1gii(i32 noundef [[X:%.*]], i32 noundef [[Y:%.*]])
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[X_ADDR:%.*]] = alloca i32
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// CHECK-NEXT: [[Y_ADDR:%.*]] = alloca i32
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// CHECK-NEXT: store i32 [[X]], ptr [[X_ADDR]]
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// CHECK-NEXT: store i32 [[Y]], ptr [[Y_ADDR]]
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void g(int x, int y) {
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// Not emitted because it has side-effects.
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[[assume(f())]];
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// CHECK-NEXT: call void @llvm.assume(i1 true)
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[[assume((1, 2))]];
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// CHECK-NEXT: [[X1:%.*]] = load i32, ptr [[X_ADDR]]
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// CHECK-NEXT: [[CMP1:%.*]] = icmp ne i32 [[X1]], 27
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// CHECK-NEXT: call void @llvm.assume(i1 [[CMP1]])
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[[assume(x != 27)]];
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// CHECK-NEXT: [[X2:%.*]] = load i32, ptr [[X_ADDR]]
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// CHECK-NEXT: [[Y2:%.*]] = load i32, ptr [[Y_ADDR]]
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// CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[X2]], [[Y2]]
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// CHECK-NEXT: call void @llvm.assume(i1 [[CMP2]])
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[[assume(x == y)]];
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// CHECK-NEXT: call void @_Z2f2IiEvv()
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f2<int>();
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// CHECK-NEXT: call void @_Z2f2IdEvv()
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f2<double>();
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}
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// CHECK: void @_Z2f2IiEvv()
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// CHECK-NEXT: entry:
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// CHECK-NEXT: call void @llvm.assume(i1 true)
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// CHECK: void @_Z2f2IdEvv()
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// CHECK-NEXT: entry:
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// CHECK-NEXT: call void @llvm.assume(i1 false)
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