1 files changed, 44 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/avr/divmodqi4.S b/contrib/llvm-project/compiler-rt/lib/builtins/avr/divmodqi4.S
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index 000000000000..66cfc0c69bba
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+++ b/contrib/llvm-project/compiler-rt/lib/builtins/avr/divmodqi4.S
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+//===------------- divmodqi4.S - sint8 div & mod --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// As described at
+// https://gcc.gnu.org/wiki/avr-gcc#Exceptions_to_the_Calling_Convention, the
+// prototype is `struct {sint8, sint8}  __divmodqi4(sint8, sint8)`.
+// The sint8 quotient is returned via R24, and the sint8 remainder is returned
+// via R25, while registers R23/Rtmp and bit T in SREG are clobbered.
+//
+//===----------------------------------------------------------------------===//
+
+	.text
+	.align 2
+
+#ifdef __AVR_TINY__
+	.set __tmp_reg__, 16
+#else
+	.set __tmp_reg__, 0
+#endif
+
+	.globl __divmodqi4
+	.type  __divmodqi4, @function
+
+__divmodqi4:
+	bst     r24, 7
+	mov     __tmp_reg__, r24
+	eor     __tmp_reg__, r22
+	sbrc    r24, 7
+	neg     r24
+	sbrc    r22, 7
+	neg     r22
+	rcall   __udivmodqi4   ; Call __udivmodqi4 to do real calculation.
+	brtc    __divmodqi4_1
+	neg     r25
+
+__divmodqi4_1:
+	sbrc    __tmp_reg__, 7
+	neg     r24
+	ret                    ; Return quotient via R24 and remainder via R25.