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Added sb instruction support for ARMv9 architecture #66

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Added sb instruction support for ARMv9 architecture #66

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1 change: 1 addition & 0 deletions Makefile.in
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Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,7 @@ C_SRCS := $(srcroot)src/jemalloc.c \
$(srcroot)src/safety_check.c \
$(srcroot)src/sc.c \
$(srcroot)src/sec.c \
$(srcroot)src/spin_delay_arm.c \
$(srcroot)src/stats.c \
$(srcroot)src/sz.c \
$(srcroot)src/tcache.c \
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6 changes: 5 additions & 1 deletion include/jemalloc/internal/spin.h
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Expand Up @@ -2,6 +2,7 @@
#define JEMALLOC_INTERNAL_SPIN_H

#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/spin_delay_arm.h"

#define SPIN_INITIALIZER \
{ 0U }
Expand All @@ -12,7 +13,10 @@ typedef struct {

static inline void
spin_cpu_spinwait(void) {
#if HAVE_CPU_SPINWAIT
#if defined(__linux__) && (defined(__aarch64__) || defined(__arm64__)) && \
(defined(__GNUC__) || defined(__clang__))
spin_delay_arm();
#elif HAVE_CPU_SPINWAIT
CPU_SPINWAIT;
#else
volatile int x = 0;
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13 changes: 13 additions & 0 deletions include/jemalloc/internal/spin_delay_arm.h
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@@ -0,0 +1,13 @@
#include "jemalloc/internal/jemalloc_preamble.h"

/* Global variable to track SB support */
extern int arm_has_sb_instruction;

/* Use SB instruction if available, otherwise ISB */
static inline void spin_delay_arm(void) {
if (__builtin_expect(arm_has_sb_instruction == 1, 1)) {
asm volatile(".inst 0xd50330ff \n"); /* SB instruction encoding */
} else {
asm volatile("isb; \n");
}
}
15 changes: 15 additions & 0 deletions src/spin_delay_arm.c
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@@ -0,0 +1,15 @@
#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/spin_delay_arm.h"

/* Initialize to 0 (false) by default */
int arm_has_sb_instruction = 0;

#if defined(__linux__) && (defined(__aarch64__) || defined(__arm64__)) && \
(defined(__GNUC__) || defined(__clang__))
#include <sys/auxv.h>

__attribute__((constructor))
void detect_arm_sb_support(void) {
arm_has_sb_instruction = (getauxval(AT_HWCAP) & HWCAP_SB) ? 1 : 0;
}
#endif
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