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[PATCH v4 2/3] x86: use __builtin_popcountl() for arch_hweightl() when available
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 15 Oct 2026 11:10:24 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>
- Delivery-date: Thu, 15 Oct 2026 09:10:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Use the respective compiler builtin when available; no need to play any
alternatives games in such configurations.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v4: Re-base (re-do).
--- a/xen/arch/x86/include/asm/bitops.h
+++ b/xen/arch/x86/include/asm/bitops.h
@@ -500,6 +500,9 @@ static always_inline unsigned int arch_f
unsigned int arch_generic_hweightl(unsigned long x);
+#ifdef __POPCNT__
+#define arch_hweightl __builtin_popcountl
+#else /* !__POPCNT__ */
static always_inline unsigned int arch_hweightl(unsigned long x)
{
unsigned int r;
@@ -525,5 +528,6 @@ static always_inline unsigned int arch_h
return r;
}
#define arch_hweightl arch_hweightl
+#endif /* __POPCNT__ */
#endif /* _X86_BITOPS_H */
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