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readonly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55858 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
748 B
C
16 lines
748 B
C
// RUN: %llvmgcc -O3 -S -o - -emit-llvm %s | not grep readonly
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// RUN: %llvmgcc -O3 -S -o - -emit-llvm %s | not grep 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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