Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arc / lib / strchr-700.S

diff --git a/qemu/roms/u-boot/arch/arc/lib/strchr-700.S b/qemu/roms/u-boot/arch/arc/lib/strchr-700.S
new file mode 100644 (file)
index 0000000..55fcc9f
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arc/lib/strchr-700.S
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * ARC700 has a relatively long pipeline and branch prediction, so we want
+ * to avoid branches that are hard to predict.  On the other hand, the
+ * presence of the norm instruction makes it easier to operate on whole
+ * words branch-free.
+ */
+
+.global strchr
+.align 4
+strchr:
+       extb_s  %r1, %r1
+       asl     %r5, %r1, 8
+       bmsk    %r2, %r0, 1
+       or      %r5, %r5, %r1
+       mov_s   %r3, 0x01010101
+       breq.d  %r2, %r0, .Laligned
+       asl     %r4, %r5, 16
+       sub_s   %r0, %r0, %r2
+       asl     %r7, %r2, 3
+       ld_s    %r2, [%r0]
+#ifdef __LITTLE_ENDIAN__
+       asl     %r7, %r3, %r7
+#else /* __BIG_ENDIAN__ */
+       lsr     %r7, %r3, %r7
+#endif /* _ENDIAN__ */
+       or      %r5, %r5, %r4
+       ror     %r4, %r3
+       sub     %r12, %r2, %r7
+       bic_s   %r12, %r12, %r2
+       and     %r12, %r12, %r4
+       brne.d  %r12, 0, .Lfound0_ua
+       xor     %r6, %r2, %r5
+       ld.a    %r2, [%r0, 4]
+       sub     %r12, %r6, %r7
+       bic     %r12, %r12, %r6
+#ifdef __LITTLE_ENDIAN__
+       and     %r7, %r12, %r4
+       /* For speed, we want this branch to be unaligned. */
+       breq    %r7, 0, .Loop
+       /* Likewise this one */
+       b       .Lfound_char
+#else /* __BIG_ENDIAN__ */
+       and     %r12, %r12, %r4
+       /* For speed, we want this branch to be unaligned. */
+       breq    %r12, 0, .Loop
+       lsr_s   %r12, %r12, 7
+       bic     %r2, %r7, %r6
+       b.d     .Lfound_char_b
+       and_s   %r2, %r2, %r12
+#endif /* _ENDIAN__ */
+       /* We require this code address to be unaligned for speed...  */
+.Laligned:
+       ld_s    %r2, [%r0]
+       or      %r5, %r5, %r4
+       ror     %r4, %r3
+       /* ... so that this code address is aligned, for itself and ...  */
+.Loop:
+       sub     %r12, %r2, %r3
+       bic_s   %r12, %r12, %r2
+       and     %r12, %r12, %r4
+       brne.d  %r12, 0, .Lfound0
+       xor     %r6, %r2, %r5
+       ld.a    %r2, [%r0, 4]
+       sub     %r12, %r6, %r3
+       bic     %r12, %r12, %r6
+       and     %r7, %r12, %r4
+       breq    %r7, 0, .Loop
+       /*
+        *... so that this branch is unaligned.
+        * Found searched-for character.
+        * r0 has already advanced to next word.
+        */
+#ifdef __LITTLE_ENDIAN__
+       /*
+        * We only need the information about the first matching byte
+        * (i.e. the least significant matching byte) to be exact,
+        * hence there is no problem with carry effects.
+        */
+.Lfound_char:
+       sub     %r3, %r7, 1
+       bic     %r3, %r3, %r7
+       norm    %r2, %r3
+       sub_s   %r0, %r0, 1
+       asr_s   %r2, %r2, 3
+       j.d     [%blink]
+       sub_s   %r0, %r0, %r2
+
+       .balign 4
+.Lfound0_ua:
+       mov     %r3, %r7
+.Lfound0:
+       sub     %r3, %r6, %r3
+       bic     %r3, %r3, %r6
+       and     %r2, %r3, %r4
+       or_s    %r12, %r12, %r2
+       sub_s   %r3, %r12, 1
+       bic_s   %r3, %r3, %r12
+       norm    %r3, %r3
+       add_s   %r0, %r0, 3
+       asr_s   %r12, %r3, 3
+       asl.f   0, %r2, %r3
+       sub_s   %r0, %r0, %r12
+       j_s.d   [%blink]
+       mov.pl  %r0, 0
+#else /* __BIG_ENDIAN__ */
+.Lfound_char:
+       lsr     %r7, %r7, 7
+
+       bic     %r2, %r7, %r6
+.Lfound_char_b:
+       norm    %r2, %r2
+       sub_s   %r0, %r0, 4
+       asr_s   %r2, %r2, 3
+       j.d     [%blink]
+       add_s   %r0, %r0, %r2
+
+.Lfound0_ua:
+       mov_s   %r3, %r7
+.Lfound0:
+       asl_s   %r2, %r2, 7
+       or      %r7, %r6, %r4
+       bic_s   %r12, %r12, %r2
+       sub     %r2, %r7, %r3
+       or      %r2, %r2, %r6
+       bic     %r12, %r2, %r12
+       bic.f   %r3, %r4, %r12
+       norm    %r3, %r3
+
+       add.pl  %r3, %r3, 1
+       asr_s   %r12, %r3, 3
+       asl.f   0, %r2, %r3
+       add_s   %r0, %r0, %r12
+       j_s.d   [%blink]
+       mov.mi  %r0, 0
+#endif /* _ENDIAN__ */