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zcommon: Refactor FPU state handling in fletcher4

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Currently calls to kfpu_begin() and kfpu_end() are split between
the init() and fini() functions of the particular SIMD
implementation. This was done in #14247 as an optimization measure
for the ABD adapter. Unfortunately the split complicates FPU
handling on platforms that use a local FPU state buffer, like
Windows and macOS.

To ease porting, we introduce a boolean struct member in
fletcher_4_ops_t, indicating use of the FPU, and move the FPU state
handling from the SIMD implementations to the call sites.

Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Signed-off-by: Attila Fülöp <attila@fueloep.org>
Closes #14600
This commit is contained in:
Attila Fülöp
2023-03-14 17:45:28 +01:00
committed by GitHub
parent b15ab50c4d
commit 78289b8458
9 changed files with 44 additions and 17 deletions
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include/zfs_fletcher.h
+2 -1
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@@ -126,8 +126,9 @@ typedef struct fletcher_4_func {
fletcher_4_fini_f fini_byteswap;
fletcher_4_compute_f compute_byteswap;
boolean_t (*valid)(void);
boolean_t uses_fpu;
const char *name;
} fletcher_4_ops_t;
} __attribute__((aligned(64))) fletcher_4_ops_t;
_ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_superscalar_ops;
_ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_superscalar4_ops;