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Add RECOMP_FUNC definition to recomp.h for disabling IPO (#59)

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Wiseguy 2024-08-13 23:30:33 -04:00 • committed by GitHub
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commit 0a53855333
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17
librecomp/include/librecomp/recomp.h
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@ -6,6 +6,23 @@
#include <math.h>
#include <assert.h>
// Compiler definition to disable inter-procedural optimization, allowing multiple functions to be in a single file without breaking interposition.
#if defined(_MSC_VER) && !defined(__clang__)
// MSVC's __declspec(noinline) seems to disable inter-procedural optimization entirely, so it's all that's needed.
#define RECOMP_FUNC __declspec(noinline)
#elif defined(__clang__)
// Clang has no dedicated IPO attribute, so we use a combination of other attributes to give the desired behavior.
// The inline keyword allows multiple definitions during linking, and extern forces clang to emit an externally visible definition.
// Weak forces Clang to not perform any IPO as the symbol can be interposed, which prevents actual inlining due to the inline keyword.
// Add noinline on for good measure, which doesn't conflict with the inline keyword as they have different meanings.
#define RECOMP_FUNC extern inline __attribute__((weak,noinline))
#elif defined(__GNUC__)
// Use GCC's attribute for disabling inter-procedural optimizations.
#define RECOMP_FUNC __attribute__((noipa))
#else
#error "No RECOMP_FUNC definition for this compiler"
#endif
typedef uint64_t gpr;
#define SIGNED(val) \