forked from OSchip/llvm-project
21 lines
894 B
C
21 lines
894 B
C
// RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s | FileCheck -check-prefix=NULL-POINTER-INVALID %s
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// RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s -fno-delete-null-pointer-checks | FileCheck -check-prefix=NULL-POINTER-VALID %s
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// Test that clang does not remove the null pointer check with
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// -fno-delete-null-pointer-checks.
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int null_check(int *P) {
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// NULL-POINTER-VALID: %[[TOBOOL:.*]] = icmp eq i32* %P, null
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// NULL-POINTER-INVALID-NOT: icmp eq
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// NULL-POINTER-VALID: %[[SEL:.*]] = select i1 %[[TOBOOL:.*]], i32* null, i32*
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// NULL-POINTER-INVALID-NOT: select i1
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// NULL-POINTER-VALID: load i32, i32* %[[SEL:.*]]
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int *Q = P;
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if (P) {
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Q = P + 2;
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}
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return *Q;
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}
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// NULL-POINTER-INVALID-NOT: attributes #0 = {{.*}} "null-pointer-is-valid"="true"
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// NULL-POINTER-VALID: attributes #0 = {{.*}} "null-pointer-is-valid"="true"
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