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2024-02-19 890e1df1bec891d9203724541e81f8fbe5183388

 kernel/lib/zstd/zstd_internal.h
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@@ -127,7 +127,14 @@
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 *  Shared functions to include for inlining
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 *********************************************/
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 ZSTD_STATIC void ZSTD_copy8(void *dst, const void *src) {
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-	memcpy(dst, src, 8);
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+	/*
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+	 * zstd relies heavily on gcc being able to analyze and inline this
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+	 * memcpy() call, since it is called in a tight loop. Preboot mode
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+	 * is compiled in freestanding mode, which stops gcc from analyzing
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+	 * memcpy(). Use __builtin_memcpy() to tell gcc to analyze this as a
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+	 * regular memcpy().
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+	 */
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+	__builtin_memcpy(dst, src, 8);
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 }
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 /*! ZSTD_wildcopy() :
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 *   custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */
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@@ -137,13 +144,16 @@
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 	const BYTE* ip = (const BYTE*)src;
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 	BYTE* op = (BYTE*)dst;
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 	BYTE* const oend = op + length;
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-	/* Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388.
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+#if defined(GCC_VERSION) && GCC_VERSION >= 70000 && GCC_VERSION < 70200
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+	/*
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+	 * Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388.
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 	 * Avoid the bad case where the loop only runs once by handling the
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 	 * special case separately. This doesn't trigger the bug because it
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 	 * doesn't involve pointer/integer overflow.
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 	 */
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 	if (length <= 8)
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 		return ZSTD_copy8(dst, src);
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+#endif
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 	do {
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 		ZSTD_copy8(op, ip);
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 		op += 8;