5fdd094837
In the beginning, Clang only emitted atomic IR for operations it knew the underlying microarch had instructions for, meaning it required significant knowledge of the target. Later, the backend acquired the ability to lower IR to libcalls. To avoid duplicating logic and improve logic locality, we'd like to move as much as possible to the backend. There are many ways to describe this change. For example, this change reduces the variables Clang uses to decide whether to emit libcalls or IR, down to only the atomic's size.
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
// RUN: %clang_cc1 %s -std=c++11 -emit-llvm -o - -triple=x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 %s -std=c++11 -emit-llvm -o - -triple=x86_64-linux-gnu -target-cpu core2 | FileCheck %s --check-prefix=CORE2
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// Check the atomic code generation for cpu targets w/wo cx16 support.
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struct alignas(8) AM8 {
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int f1, f2;
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};
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AM8 m8;
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AM8 load8() {
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AM8 am;
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// CHECK-LABEL: @_Z5load8v
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// CHECK: load atomic i64, {{.*}} monotonic, align 8
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// CORE2-LABEL: @_Z5load8v
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// CORE2: load atomic i64, {{.*}} monotonic, align 8
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__atomic_load(&m8, &am, 0);
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return am;
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}
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AM8 s8;
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void store8() {
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// CHECK-LABEL: @_Z6store8v
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// CHECK: store atomic i64 {{.*}} monotonic, align 8
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// CORE2-LABEL: @_Z6store8v
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// CORE2: store atomic i64 {{.*}} monotonic, align 8
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__atomic_store(&m8, &s8, 0);
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}
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bool cmpxchg8() {
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AM8 am;
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// CHECK-LABEL: @_Z8cmpxchg8v
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// CHECK: cmpxchg ptr {{.*}} monotonic, align 8
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// CORE2-LABEL: @_Z8cmpxchg8v
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// CORE2: cmpxchg ptr {{.*}} monotonic, align 8
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return __atomic_compare_exchange(&m8, &s8, &am, 0, 0, 0);
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}
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struct alignas(16) AM16 {
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long f1, f2;
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};
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AM16 m16;
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AM16 load16() {
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AM16 am;
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// CHECK-LABEL: @_Z6load16v
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// CHECK: load atomic i128, {{.*}} monotonic, align 16
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// CORE2-LABEL: @_Z6load16v
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// CORE2: load atomic i128, {{.*}} monotonic, align 16
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__atomic_load(&m16, &am, 0);
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return am;
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}
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AM16 s16;
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void store16() {
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// CHECK-LABEL: @_Z7store16v
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// CHECK: store atomic i128 {{.*}} monotonic, align 16
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// CORE2-LABEL: @_Z7store16v
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// CORE2: store atomic i128 {{.*}} monotonic, align 16
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__atomic_store(&m16, &s16, 0);
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}
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bool cmpxchg16() {
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AM16 am;
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// CHECK-LABEL: @_Z9cmpxchg16v
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// CHECK: cmpxchg ptr {{.*}} monotonic monotonic, align 16
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// CORE2-LABEL: @_Z9cmpxchg16v
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// CORE2: cmpxchg ptr {{.*}} monotonic monotonic, align 16
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return __atomic_compare_exchange(&m16, &s16, &am, 0, 0, 0);
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}
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