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- Log ----------------------------------------------------------------- commit 00ac7acc665db429e476a4047ef53cd8df6f5999 Author: Claudiu Zissulescu claziss@synopsys.com Date: Mon Jul 20 17:12:32 2015 +0300

ARCv2: update memset() so it could be used without double load/stores

Existing version of memset() relies on existence of 64-bit load/stores. While ARC HS38 may not have those instructions implemented in SoC.

Proposed implementation checks if "-mno-ll64" option was passed to gcc (for ARCv2 "-mll64" is set implicitly by default) by checking __LL64__ definition and if it is not defined uses 32-bit load/stores.

Signed-off-by: Claudiu Zissulescu claziss@synopsys.com Signed-off-by: Alexey Brodkin abrodkin@synopsys.com Cc: Vineet Gupta vgupta@synopsys.com

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Summary of changes: libc/string/arc/arcv2/memset.S | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)

diff --git a/libc/string/arc/arcv2/memset.S b/libc/string/arc/arcv2/memset.S index d076ad1..0918d37 100644 --- a/libc/string/arc/arcv2/memset.S +++ b/libc/string/arc/arcv2/memset.S @@ -52,6 +52,7 @@ ENTRY(memset) lpnz @.Lset64bytes ;; LOOP START PREWRITE(r3, 64) ;Prefetch the next write location +#ifdef __LL64__ std.ab r4, [r3, 8] std.ab r4, [r3, 8] std.ab r4, [r3, 8] @@ -60,16 +61,45 @@ ENTRY(memset) std.ab r4, [r3, 8] std.ab r4, [r3, 8] std.ab r4, [r3, 8] +#else + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] +#endif .Lset64bytes:

lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes lpnz .Lset32bytes ;; LOOP START prefetchw [r3, 32] ;Prefetch the next write location +#ifdef __LL64__ std.ab r4, [r3, 8] std.ab r4, [r3, 8] std.ab r4, [r3, 8] std.ab r4, [r3, 8] +#else + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] + st.ab r4, [r3, 4] +#endif .Lset32bytes:

and.f lp_count, r2, 0x1F ;Last remaining 31 bytes

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