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Diffstat (limited to 'arch/c6x/lib/divremu.S')
-rw-r--r-- | arch/c6x/lib/divremu.S | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/arch/c6x/lib/divremu.S b/arch/c6x/lib/divremu.S deleted file mode 100644 index 5f6a6a2997ae..000000000000 --- a/arch/c6x/lib/divremu.S +++ /dev/null @@ -1,75 +0,0 @@ -;; SPDX-License-Identifier: GPL-2.0-or-later -;; Copyright 2011 Free Software Foundation, Inc. -;; Contributed by Bernd Schmidt <bernds@codesourcery.com>. -;; - -#include <linux/linkage.h> - - .text -ENTRY(__c6xabi_divremu) - ;; We use a series of up to 31 subc instructions. First, we find - ;; out how many leading zero bits there are in the divisor. This - ;; gives us both a shift count for aligning (shifting) the divisor - ;; to the, and the number of times we have to execute subc. - - ;; At the end, we have both the remainder and most of the quotient - ;; in A4. The top bit of the quotient is computed first and is - ;; placed in A2. - - ;; Return immediately if the dividend is zero. Setting B4 to 1 - ;; is a trick to allow us to leave the following insns in the jump - ;; delay slot without affecting the result. - mv .s2x A4, B1 - - [b1] lmbd .l2 1, B4, B1 -||[!b1] b .s2 B3 ; RETURN A -||[!b1] mvk .d2 1, B4 - -||[!b1] zero .s1 A5 - mv .l1x B1, A6 -|| shl .s2 B4, B1, B4 - - ;; The loop performs a maximum of 28 steps, so we do the - ;; first 3 here. - cmpltu .l1x A4, B4, A2 - [!A2] sub .l1x A4, B4, A4 -|| shru .s2 B4, 1, B4 -|| xor .s1 1, A2, A2 - - shl .s1 A2, 31, A2 -|| [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - - ;; RETURN A may happen here (note: must happen before the next branch) -__divremu0: - cmpgt .l2 B1, 7, B0 -|| [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 -|| [b0] b .s1 __divremu0 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - [b1] subc .l1x A4,B4,A4 -|| [b1] add .s2 -1, B1, B1 - ;; loop backwards branch happens here - - ret .s2 B3 -|| mvk .s1 32, A1 - sub .l1 A1, A6, A6 -|| extu .s1 A4, A6, A5 - shl .s1 A4, A6, A4 - shru .s1 A4, 1, A4 -|| sub .l1 A6, 1, A6 - or .l1 A2, A4, A4 - shru .s1 A4, A6, A4 - nop -ENDPROC(__c6xabi_divremu) |