Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / blackfin / lib / memcmp.S

diff --git a/qemu/roms/u-boot/arch/blackfin/lib/memcmp.S b/qemu/roms/u-boot/arch/blackfin/lib/memcmp.S
new file mode 100644 (file)
index 0000000..c8a5bed
--- /dev/null
+++ b/qemu/roms/u-boot/arch/blackfin/lib/memcmp.S
@@ -0,0 +1,90 @@
+/*
+ * File: memcmp.S
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+.align 2
+
+/*
+ * C Library function MEMCMP
+ * R0 = First Address
+ * R1 = Second Address
+ * R2 = count
+ * Favours word aligned data.
+ */
+
+.globl _memcmp;
+.type _memcmp, STT_FUNC;
+_memcmp:
+       I1 = P3;
+       P0 = R0;                        /* P0 = s1 address */
+       P3 = R1;                        /* P3 = s2 Address  */
+       P2 = R2 ;                       /* P2 = count */
+       CC = R2 <= 7(IU);
+       IF CC JUMP  .Ltoo_small;
+       I0 = R1;                        /* s2 */
+       R1 = R1 | R0;           /* OR addresses together */
+       R1 <<= 30;              /* check bottom two bits */
+       CC =  AZ;                       /* AZ set if zero. */
+       IF !CC JUMP  .Lbytes ;  /* Jump if addrs not aligned. */
+
+       P1 = P2 >> 2;           /* count = n/4 */
+       R3 =  3;
+       R2 = R2 & R3;           /* remainder */
+       P2 = R2;                        /* set remainder */
+
+       LSETUP (.Lquad_loop_s , .Lquad_loop_e) LC0=P1;
+.Lquad_loop_s:
+       NOP;
+       R0 = [P0++];
+       R1 = [I0++];
+       CC = R0 == R1;
+       IF !CC JUMP .Lquad_different;
+.Lquad_loop_e:
+       NOP;
+
+       P3 = I0;                        /* s2 */
+.Ltoo_small:
+       CC = P2 == 0;           /* Check zero count*/
+       IF CC JUMP .Lfinished;  /* very unlikely*/
+
+.Lbytes:
+       LSETUP (.Lbyte_loop_s , .Lbyte_loop_e) LC0=P2;
+.Lbyte_loop_s:
+       R1 = B[P3++](Z);        /* *s2 */
+       R0 = B[P0++](Z);        /* *s1 */
+       CC = R0 == R1;
+       IF !CC JUMP .Ldifferent;
+.Lbyte_loop_e:
+       NOP;
+
+.Ldifferent:
+       R0 = R0 - R1;
+       P3 = I1;
+       RTS;
+
+.Lquad_different:
+/* We've read two quads which don't match.
+ * Can't just compare them, because we're
+ * a little-endian machine, so the MSBs of
+ * the regs occur at later addresses in the
+ * string.
+ * Arrange to re-read those two quads again,
+ * byte-by-byte.
+ */
+       P0 += -4;               /* back up to the start of the */
+       P3 = I0;                /* quads, and increase the*/
+       P2 += 4;                /* remainder count*/
+       P3 += -4;
+       JUMP .Lbytes;
+
+.Lfinished:
+       R0 = 0;
+       P3 = I1;
+       RTS;
+
+.size _memcmp, .-_memcmp