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-rw-r--r--arch/powerpc/lib/hweight_64.S104
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/powerpc/lib/hweight_64.S b/arch/powerpc/lib/hweight_64.S
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+++ b/arch/powerpc/lib/hweight_64.S
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *
+ * Copyright (C) IBM Corporation, 2010
+ *
+ * Author: Anton Blanchard <anton@au.ibm.com>
+ */
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/export.h>
+#include <asm/feature-fixups.h>
+
+/* Note: This code relies on -mminimal-toc */
+
+_GLOBAL(__arch_hweight8)
+BEGIN_FTR_SECTION
+ b __sw_hweight8
+ nop
+ nop
+FTR_SECTION_ELSE
+ PPC_POPCNTB(R3,R3)
+ clrldi r3,r3,64-8
+ blr
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+EXPORT_SYMBOL(__arch_hweight8)
+
+_GLOBAL(__arch_hweight16)
+BEGIN_FTR_SECTION
+ b __sw_hweight16
+ nop
+ nop
+ nop
+ nop
+FTR_SECTION_ELSE
+ BEGIN_FTR_SECTION_NESTED(50)
+ PPC_POPCNTB(R3,R3)
+ srdi r4,r3,8
+ add r3,r4,r3
+ clrldi r3,r3,64-8
+ blr
+ FTR_SECTION_ELSE_NESTED(50)
+ clrlwi r3,r3,16
+ PPC_POPCNTW(R3,R3)
+ clrldi r3,r3,64-8
+ blr
+ ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_POPCNTD, 50)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+EXPORT_SYMBOL(__arch_hweight16)
+
+_GLOBAL(__arch_hweight32)
+BEGIN_FTR_SECTION
+ b __sw_hweight32
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+FTR_SECTION_ELSE
+ BEGIN_FTR_SECTION_NESTED(51)
+ PPC_POPCNTB(R3,R3)
+ srdi r4,r3,16
+ add r3,r4,r3
+ srdi r4,r3,8
+ add r3,r4,r3
+ clrldi r3,r3,64-8
+ blr
+ FTR_SECTION_ELSE_NESTED(51)
+ PPC_POPCNTW(R3,R3)
+ clrldi r3,r3,64-8
+ blr
+ ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_POPCNTD, 51)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+EXPORT_SYMBOL(__arch_hweight32)
+
+_GLOBAL(__arch_hweight64)
+BEGIN_FTR_SECTION
+ b __sw_hweight64
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+FTR_SECTION_ELSE
+ BEGIN_FTR_SECTION_NESTED(52)
+ PPC_POPCNTB(R3,R3)
+ srdi r4,r3,32
+ add r3,r4,r3
+ srdi r4,r3,16
+ add r3,r4,r3
+ srdi r4,r3,8
+ add r3,r4,r3
+ clrldi r3,r3,64-8
+ blr
+ FTR_SECTION_ELSE_NESTED(52)
+ PPC_POPCNTD(R3,R3)
+ clrldi r3,r3,64-8
+ blr
+ ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_POPCNTD, 52)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+EXPORT_SYMBOL(__arch_hweight64)