82 lines
2.1 KiB
Diff
82 lines
2.1 KiB
Diff
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From 9b79d39b027f0a44215c4c13f7fd23b710727c37 Mon Sep 17 00:00:00 2001
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From: Alexey Brodkin <abrodkin@synopsys.com>
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Date: Thu, 16 Jul 2015 11:38:29 +0300
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Subject: [PATCH] ARCv2: update memset() so it could be used without double
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load/stores
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Existing version of memset() relies on existence of 64-bit load/stores.
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While ARC HS38 may not have those instructions implemented in SoC.
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Proposed implementation checks if "-mno-ll64" option was passed to gcc
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(for ARCv2 "-mll64" is set implicitly by default) by checking __LL64__
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definition and if it is not defined uses 32-bit load/stores.
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Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
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Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
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Cc: Vineet Gupta <vgupta@synopsys.com>
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---
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libc/string/arc/arcv2/memset.S | 30 ++++++++++++++++++++++++++++++
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1 file changed, 30 insertions(+)
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diff --git a/libc/string/arc/arcv2/memset.S b/libc/string/arc/arcv2/memset.S
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index d076ad1..0918d37 100644
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--- a/libc/string/arc/arcv2/memset.S
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+++ b/libc/string/arc/arcv2/memset.S
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@@ -52,6 +52,7 @@ ENTRY(memset)
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lpnz @.Lset64bytes
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;; LOOP START
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PREWRITE(r3, 64) ;Prefetch the next write location
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+#ifdef __LL64__
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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@@ -60,16 +61,45 @@ ENTRY(memset)
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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+#else
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+#endif
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.Lset64bytes:
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lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes
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lpnz .Lset32bytes
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;; LOOP START
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prefetchw [r3, 32] ;Prefetch the next write location
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+#ifdef __LL64__
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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+#else
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+ st.ab r4, [r3, 4]
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+#endif
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.Lset32bytes:
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and.f lp_count, r2, 0x1F ;Last remaining 31 bytes
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--
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2.4.3
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