Changeset 0366d09d in mainline for kernel/arch/arm32/include/arch/fpu_context.h

Timestamp:

2023-02-07T16:49:43Z (15 months 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/arm32/include/arch/fpu_context.h (modified) (1 diff)

kernel/arch/arm32/include/arch/fpu_context.h

@@ -40 +40 @@
 #include <stdint.h>
 
-#define FPU_CONTEXT_ALIGN    8
-
 /*
  * ARM Architecture reference manual, p B-1529.
  */
 typedef struct {
-        uint32_t fpexc;
+        _Alignas(8) uint32_t fpexc;
         uint32_t fpscr;
         uint32_t s[64];