forked from OSchip/llvm-project
18 lines
823 B
C
18 lines
823 B
C
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
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// It could hit in @llvm.memcpy with "-triple x86_64-(mingw32|win32)".
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// CHECK-NOT: readonly
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// CHECK-NOT: readnone
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// The struct being passed byval means that we cannot mark the
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// function readnone. Readnone would allow stores to the arg to
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// be deleted in the caller. We also don't allow readonly since
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// the callee might write to the byval parameter. The inliner
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// would have to assume the worse and introduce an explicit
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// temporary when inlining such a function, which is costly for
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// the common case in which the byval argument is not written.
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struct S { int A[1000]; };
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int __attribute__ ((const)) f(struct S x) { x.A[1] = 0; return x.A[0]; }
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int g(struct S x) __attribute__ ((pure));
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int h(struct S x) { return g(x); }
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