Changeset 0366d09d in mainline for kernel/arch/sparc64/include/arch/fpu_context.h

Timestamp:

2023-02-07T16:49:43Z (2 years ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

78acbc72

Parents:

1eaead4

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2022-08-14 14:08:42)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-02-07 16:49:43)

Message:

Avoid separate allocation for FPU context

With _Alignas, we can encode alignment in the type itself and
include it directly as a member of thread_t, thus removing
the need for a separate allocation.

The alignment requirement is never more than 16 bytes,
so this adds only minimal extra padding to the structure.

File:

• kernel/arch/sparc64/include/arch/fpu_context.h (modified) (1 diff)

kernel/arch/sparc64/include/arch/fpu_context.h

@@ -38 +38 @@
 #include <stdint.h>
 
-#define FPU_CONTEXT_ALIGN       8
-
 typedef struct {
-        uint64_t        d[32];
-        uint64_t        fsr;
+        _Alignas(8) uint64_t d[32];
+        uint64_t fsr;
 } fpu_context_t;