51 lines
1.7 KiB
Diff
51 lines
1.7 KiB
Diff
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From ad6541a22dd909a04d745b42c8da5e04733efec4 Mon Sep 17 00:00:00 2001
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From: Xi Ruoyao <xry111@xry111.site>
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Date: Wed, 12 Oct 2022 22:06:07 +0800
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Subject: [PATCH 023/124] LoongArch: implement count_{leading,trailing}_zeros
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LoongArch always support clz and ctz instructions, so we can always use
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__builtin_{clz,ctz} for count_{leading,trailing}_zeros. This improves
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the code of libgcc, and also benefits Glibc once we merge longlong.h
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there.
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Bootstrapped and regtested on loongarch64-linux-gnu.
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include/ChangeLog:
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* longlong.h [__loongarch__] (count_leading_zeros): Define.
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[__loongarch__] (count_trailing_zeros): Likewise.
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[__loongarch__] (COUNT_LEADING_ZEROS_0): Likewise.
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Signed-off-by: Peng Fan <fanpeng@loongson.cn>
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Signed-off-by: ticat_fp <fanpeng@loongson.cn>
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---
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include/longlong.h | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/include/longlong.h b/include/longlong.h
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index 64a7b10f9..c3a6f1e7e 100644
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--- a/include/longlong.h
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+++ b/include/longlong.h
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@@ -593,6 +593,18 @@ extern UDItype __umulsidi3 (USItype, USItype);
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#define UMUL_TIME 14
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#endif
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+#ifdef __loongarch__
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+# if W_TYPE_SIZE == 32
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+# define count_leading_zeros(count, x) ((count) = __builtin_clz (x))
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+# define count_trailing_zeros(count, x) ((count) = __builtin_ctz (x))
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+# define COUNT_LEADING_ZEROS_0 32
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+# elif W_TYPE_SIZE == 64
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+# define count_leading_zeros(count, x) ((count) = __builtin_clzll (x))
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+# define count_trailing_zeros(count, x) ((count) = __builtin_ctzll (x))
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+# define COUNT_LEADING_ZEROS_0 64
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+# endif
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+#endif
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+
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#if defined (__M32R__) && W_TYPE_SIZE == 32
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#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
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/* The cmp clears the condition bit. */ \
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--
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2.33.0
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