derek.holloway
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66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
// Test __builtin_expect, __builtin_expect_with_probability, and __builtin_unpredictable.
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// Focus: O0 vs O2 CIR output (no cir.expect at O0), and LLVM/OGCG with -O2 -disable-llvm-passes.
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// Builtin call lowering is also covered by builtin_call.cpp.
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//
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// RUN: %clang_cc1 -O0 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o - | FileCheck %s --check-prefix=CIR-O0
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// CIR-O0-NOT: cir.expect
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// RUN: %clang_cc1 -O2 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o - | FileCheck %s --check-prefix=CIR-O2
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// RUN: %clang_cc1 -O2 -disable-llvm-passes -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm %s -o - | FileCheck %s --check-prefix=LLVM
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// RUN: %clang_cc1 -O2 -disable-llvm-passes -triple x86_64-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix=LLVM
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extern void __attribute__((noinline)) bar(void);
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void expect(int x) {
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if (__builtin_expect(x, 0))
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bar();
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}
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// CIR-O0: cir.func {{.*}} @expect
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// CIR-O0: cir.if {{%.*}} {
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// CIR-O0: cir.call @bar() : () -> ()
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// CIR-O2: cir.func {{.*}} @expect
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// CIR-O2: [[EXPECT:%.*]] = cir.expect({{.*}}, {{.*}}) : !s64i
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// CIR-O2: [[EXPECT_BOOL:%.*]] = cir.cast int_to_bool [[EXPECT]] : !s64i -> !cir.bool
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// CIR-O2: cir.if [[EXPECT_BOOL]]
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// CIR-O2: cir.call @bar() : () -> ()
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// LLVM-LABEL: @expect
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// LLVM: br i1 {{.*}}, label %[[THEN:.*]], label %[[END:.*]]
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// LLVM: [[THEN]]:
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// LLVM: call void @bar()
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void expect_with_probability(int x) {
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if (__builtin_expect_with_probability(x, 1, 0.8))
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bar();
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}
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// CIR-O0: cir.func {{.*}} @expect_with_probability
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// CIR-O0: cir.if {{%.*}} {
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// CIR-O0: cir.call @bar() : () -> ()
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// CIR-O2: cir.func {{.*}} @expect_with_probability
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// CIR-O2: [[EXPECT:%.*]] = cir.expect({{.*}}, {{.*}}, 8.000000e-01) : !s64i
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// CIR-O2: [[EXPECT_BOOL:%.*]] = cir.cast int_to_bool [[EXPECT]] : !s64i -> !cir.bool
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// CIR-O2: cir.if [[EXPECT_BOOL]]
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// CIR-O2: cir.call @bar() : () -> ()
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// LLVM-LABEL: @expect_with_probability
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// LLVM: br i1 {{.*}}, label %[[THEN:.*]], label %[[END:.*]]
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// LLVM: [[THEN]]:
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// LLVM: call void @bar()
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void unpredictable(int x) {
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if (__builtin_unpredictable(x > 1))
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bar();
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}
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// CIR-O0: cir.func {{.*}} @unpredictable
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// CIR-O0: cir.if {{%.*}} {
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// CIR-O0: cir.call @bar() : () -> ()
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// LLVM-LABEL: @unpredictable
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// LLVM: br i1 {{.*}}, label %[[THEN:.*]], label %[[END:.*]]
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// LLVM: [[THEN]]:
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// LLVM: call void @bar()
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