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powerpc: implement __clear_cache

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Merge LLVM commit 81f5c6270cdfcdf80e6296df216b696a7a37c8b5.

This fixes runtime of most notably pcre libraries (currently patched in ports),
and probably also other ports since currently __clear_cache() just calls
SIGABRT on powerpc.

Reviewed by:	dim
Differential Revision: https://reviews.freebsd.org/D34736
Approved by:	re (gjb)

(cherry picked from commit 57b6ac48a9)
(cherry picked from commit 16c3f5d03e)
This commit is contained in:
Piotr Kubaj 2022-04-01 21:13:13 +02:00
parent ce528519ec
commit f17fa892de
1 changed files with 4 additions and 1 deletions
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5
contrib/llvm-project/compiler-rt/lib/builtins/clear_cache.c
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@ -130,7 +130,10 @@ void __clear_cache(void *start, void *end) {
__asm __volatile("dsb ish");
}
__asm __volatile("isb sy");
#elif defined(__powerpc64__)
#elif defined(__powerpc__)
// Newer CPUs have a bigger line size made of multiple blocks, so the
// following value is a minimal common denominator for what used to be
// a single block cache line and is therefore inneficient.
const size_t line_size = 32;
const size_t len = (uintptr_t)end - (uintptr_t)start;