Adding upstream version 1.19.8.upstream/1.19.8upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/src/internal/bytealg/compare_mipsx.s b/src/internal/bytealg/compare_mipsx.s
new file mode 100644
index 0000000..857ac13
--- /dev/null
+++ b/src/internal/bytealg/compare_mipsx.s
@@ -0,0 +1,72 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build mips || mipsle
+
+#include "go_asm.h"
+#include "textflag.h"
+
+TEXT ·Compare(SB),NOSPLIT,$0-28
+	MOVW	a_base+0(FP), R3
+	MOVW	b_base+12(FP), R4
+	MOVW	a_len+4(FP), R1
+	MOVW	b_len+16(FP), R2
+	BEQ	R3, R4, samebytes
+	SGTU	R1, R2, R7
+	MOVW	R1, R8
+	CMOVN	R7, R2, R8	// R8 is min(R1, R2)
+
+	ADDU	R3, R8	// R3 is current byte in a, R8 is last byte in a to compare
+loop:
+	BEQ	R3, R8, samebytes
+
+	MOVBU	(R3), R6
+	ADDU	$1, R3
+	MOVBU	(R4), R7
+	ADDU	$1, R4
+	BEQ	R6, R7 , loop
+
+	SGTU	R6, R7, R8
+	MOVW	$-1, R6
+	CMOVZ	R8, R6, R8
+	JMP	cmp_ret
+samebytes:
+	SGTU	R1, R2, R6
+	SGTU	R2, R1, R7
+	SUBU	R7, R6, R8
+cmp_ret:
+	MOVW	R8, ret+24(FP)
+	RET
+
+TEXT runtime·cmpstring(SB),NOSPLIT,$0-20
+	MOVW	a_base+0(FP), R3
+	MOVW	a_len+4(FP), R1
+	MOVW	b_base+8(FP), R4
+	MOVW	b_len+12(FP), R2
+	BEQ	R3, R4, samebytes
+	SGTU	R1, R2, R7
+	MOVW	R1, R8
+	CMOVN	R7, R2, R8	// R8 is min(R1, R2)
+
+	ADDU	R3, R8	// R3 is current byte in a, R8 is last byte in a to compare
+loop:
+	BEQ	R3, R8, samebytes	// all compared bytes were the same; compare lengths
+
+	MOVBU	(R3), R6
+	ADDU	$1, R3
+	MOVBU	(R4), R7
+	ADDU	$1, R4
+	BEQ	R6, R7 , loop
+	// bytes differed
+	SGTU	R6, R7, R8
+	MOVW	$-1, R6
+	CMOVZ	R8, R6, R8
+	JMP	cmp_ret
+samebytes:
+	SGTU	R1, R2, R6
+	SGTU	R2, R1, R7
+	SUBU	R7, R6, R8
+cmp_ret:
+	MOVW	R8, ret+16(FP)
+	RET