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Commit 262137bc authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARCv2: lib: memset: Don't assume 64-bit load/stores



There are configurations which may not have LDD/STD

Signed-off-by: default avatarClaudiu Zissulescu <claziss@synopsys.com>
Signed-off-by: default avatarAlexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 21481f2c
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+36 −7
Original line number Diff line number Diff line
@@ -10,12 +10,6 @@

#undef PREALLOC_NOT_AVAIL

#ifdef PREALLOC_NOT_AVAIL
#define PREWRITE(A,B)	prefetchw [(A),(B)]
#else
#define PREWRITE(A,B)	prealloc [(A),(B)]
#endif

ENTRY(memset)
	prefetchw [r0]		; Prefetch the write location
	mov.f	0, r2
@@ -51,9 +45,15 @@ ENTRY(memset)

;;; Convert len to Dwords, unfold x8
	lsr.f	lp_count, lp_count, 6

	lpnz	@.Lset64bytes
	;; LOOP START
	PREWRITE(r3, 64)	;Prefetch the next write location
#ifdef PREALLOC_NOT_AVAIL
	prefetchw [r3, 64]	;Prefetch the next write location
#else
	prealloc  [r3, 64]
#endif
#ifdef CONFIG_ARC_HAS_LL64
	std.ab	r4, [r3, 8]
	std.ab	r4, [r3, 8]
	std.ab	r4, [r3, 8]
@@ -62,16 +62,45 @@ 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 CONFIG_ARC_HAS_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