Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 70 insertions, 0 deletions

diff --git a/arch/alpha/lib/strchr.S b/arch/alpha/lib/strchr.S
new file mode 100644
index 000000000000..011a175e8329
--- /dev/null
+++ b/arch/alpha/lib/strchr.S
@@ -0,0 +1,70 @@
+/*
+ * arch/alpha/lib/strchr.S
+ * Contributed by Richard Henderson (rth@tamu.edu)
+ *
+ * Return the address of a given character within a null-terminated
+ * string, or null if it is not found.
+ */
+
+#include <asm/regdef.h>
+
+        .set noreorder
+        .set noat
+
+        .align 3
+        .globl strchr
+        .ent strchr
+strchr:
+        .frame sp, 0, ra
+        .prologue 0
+
+        zapnot  a1, 1, a1       # e0    : zero extend the search character
+        ldq_u   t0, 0(a0)       # .. e1 : load first quadword
+        sll     a1, 8, t5       # e0    : replicate the search character
+        andnot  a0, 7, v0       # .. e1 : align our loop pointer
+        or      t5, a1, a1      # e0    :
+        lda     t4, -1          # .. e1 : build garbage mask
+        sll     a1, 16, t5      # e0    :
+        cmpbge  zero, t0, t2    # .. e1 : bits set iff byte == zero
+        mskqh   t4, a0, t4      # e0    :
+        or      t5, a1, a1      # .. e1 :
+        sll     a1, 32, t5      # e0    :
+        cmpbge  zero, t4, t4    # .. e1 : bits set iff byte is garbage
+        or      t5, a1, a1      # e0    :
+        xor     t0, a1, t1      # .. e1 : make bytes == c zero
+        cmpbge  zero, t1, t3    # e0    : bits set iff byte == c
+        or      t2, t3, t0      # e1    : bits set iff char match or zero match
+        andnot  t0, t4, t0      # e0    : clear garbage bits
+        bne     t0, $found      # .. e1 (zdb)
+
+$loop:  ldq     t0, 8(v0)       # e0    :
+        addq    v0, 8, v0       # .. e1 :
+        nop                     # e0    :
+        xor     t0, a1, t1      # .. e1 (ev5 data stall)
+        cmpbge  zero, t0, t2    # e0    : bits set iff byte == 0
+        cmpbge  zero, t1, t3    # .. e1 : bits set iff byte == c
+        or      t2, t3, t0      # e0    :
+        beq     t0, $loop       # .. e1 (zdb)
+
+$found: negq    t0, t1          # e0    : clear all but least set bit
+        and     t0, t1, t0      # e1 (stall)
+
+        and     t0, t3, t1      # e0    : bit set iff byte was the char
+        beq     t1, $retnull    # .. e1 (zdb)
+
+        and     t0, 0xf0, t2    # e0    : binary search for that set bit
+        and     t0, 0xcc, t3    # .. e1 :
+        and     t0, 0xaa, t4    # e0    :
+        cmovne  t2, 4, t2       # .. e1 :
+        cmovne  t3, 2, t3       # e0    :
+        cmovne  t4, 1, t4       # .. e1 :
+        addq    t2, t3, t2      # e0    :
+        addq    v0, t4, v0      # .. e1 :
+        addq    v0, t2, v0      # e0    :
+        ret                     # .. e1 :
+
+$retnull:
+        mov     zero, v0        # e0    :
+        ret                     # .. e1 :
+
+        .end strchr