sh: Add SH-5 optimized memcpy()/memset()/strcpy()/strlen().

Adopted from the uClibc optimized string versions.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/sh/lib64/memset.S b/arch/sh/lib64/memset.S
new file mode 100644
index 000000000000..2d37b0488552
--- /dev/null
+++ b/arch/sh/lib64/memset.S
@@ -0,0 +1,91 @@
+/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
+/* Modified by SuperH, Inc. September 2003 */
+!
+! Fast SH memset
+!
+! by Toshiyasu Morita (tm@netcom.com)
+!
+! SH5 code by J"orn Rennecke (joern.rennecke@superh.com)
+! Copyright 2002 SuperH Ltd.
+!
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define SHHI shlld
+#define SHLO shlrd
+#else
+#define SHHI shlrd
+#define SHLO shlld
+#endif
+
+        .section .text..SHmedia32,"ax"
+        .globl  memset
+        .type   memset, @function
+
+        .align 5
+
+memset:
+        pta/l multiquad, tr0
+        andi r2, 7, r22
+        ptabs r18, tr2
+        mshflo.b r3,r3,r3
+        add r4, r22, r23
+        mperm.w r3, r63, r3     // Fill pattern now in every byte of r3
+
+        movi 8, r9
+        bgtu/u r23, r9, tr0 // multiquad
+
+        beqi/u r4, 0, tr2       // Return with size 0 - ensures no mem accesses
+        ldlo.q r2, 0, r7
+        shlli r4, 2, r4
+        movi -1, r8
+        SHHI r8, r4, r8
+        SHHI r8, r4, r8
+        mcmv r7, r8, r3
+        stlo.q r2, 0, r3
+        blink tr2, r63
+
+multiquad:
+        pta/l lastquad, tr0
+        stlo.q r2, 0, r3
+        shlri r23, 3, r24
+        add r2, r4, r5
+        beqi/u r24, 1, tr0 // lastquad
+        pta/l loop, tr1
+        sub r2, r22, r25
+        andi r5, -8, r20   // calculate end address and
+        addi r20, -7*8, r8 // loop end address; This might overflow, so we need
+                           // to use a different test before we start the loop
+        bge/u r24, r9, tr1 // loop
+        st.q r25, 8, r3
+        st.q r20, -8, r3
+        shlri r24, 1, r24
+        beqi/u r24, 1, tr0 // lastquad
+        st.q r25, 16, r3
+        st.q r20, -16, r3
+        beqi/u r24, 2, tr0 // lastquad
+        st.q r25, 24, r3
+        st.q r20, -24, r3
+lastquad:
+        sthi.q r5, -1, r3
+        blink tr2,r63
+
+loop:
+!!!     alloco r25, 32  // QQQ comment out for short-term fix to SHUK #3895.
+                        // QQQ commenting out is locically correct, but sub-optimal
+                        // QQQ Sean McGoogan - 4th April 2003.
+        st.q r25, 8, r3
+        st.q r25, 16, r3
+        st.q r25, 24, r3
+        st.q r25, 32, r3
+        addi r25, 32, r25
+        bgeu/l r8, r25, tr1 // loop
+
+        st.q r20, -40, r3
+        st.q r20, -32, r3
+        st.q r20, -24, r3
+        st.q r20, -16, r3
+        st.q r20, -8, r3
+        sthi.q r5, -1, r3
+        blink tr2,r63
+
+        .size   memset,.-memset