Adding upstream version 1.21.8.upstream/1.21.8

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

1 files changed, 332 insertions, 0 deletions

diff --git a/src/internal/bytealg/compare_ppc64x.s b/src/internal/bytealg/compare_ppc64x.s
new file mode 100644
index 0000000..63c33ee
--- /dev/null
+++ b/src/internal/bytealg/compare_ppc64x.s
@@ -0,0 +1,332 @@
+// 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 ppc64 || ppc64le
+
+#include "go_asm.h"
+#include "textflag.h"
+
+// Helper names for x-form loads in BE ordering.
+#ifdef  GOARCH_ppc64le
+#define _LDBEX	MOVDBR
+#define _LWBEX	MOVWBR
+#define _LHBEX	MOVHBR
+#else
+#define _LDBEX	MOVD
+#define _LWBEX	MOVW
+#define _LHBEX	MOVH
+#endif
+
+#ifdef GOPPC64_power9
+#define SETB_CR0(rout) SETB CR0, rout
+#define SETB_CR1(rout) SETB CR1, rout
+#define SETB_INIT()
+#define SETB_CR0_NE(rout) SETB_CR0(rout)
+#else
+// A helper macro to emulate SETB on P8. This assumes
+// -1 is in R20, and 1 is in R21. crxlt and crxeq must
+// also be the same CR field.
+#define _SETB(crxlt, crxeq, rout) \
+	ISEL	crxeq,R0,R21,rout \
+	ISEL	crxlt,R20,rout,rout
+
+// A special case when it is know the comparison
+// will always be not equal. The result must be -1 or 1.
+#define SETB_CR0_NE(rout) \
+	ISEL	CR0LT,R20,R21,rout
+
+#define SETB_CR0(rout) _SETB(CR0LT, CR0EQ, rout)
+#define SETB_CR1(rout) _SETB(CR1LT, CR1EQ, rout)
+#define SETB_INIT() \
+	MOVD	$-1,R20 \
+	MOVD	$1,R21
+#endif
+
+TEXT ·Compare<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-56
+	// incoming:
+	// R3 a addr
+	// R4 a len
+	// R6 b addr
+	// R7 b len
+	//
+	// on entry to cmpbody:
+	// R3 return value if len(a) == len(b)
+	// R5 a addr
+	// R6 b addr
+	// R9 min(len(a),len(b))
+	SETB_INIT()
+	MOVD	R3,R5
+	CMP	R4,R7,CR0
+	CMP	R3,R6,CR7
+	ISEL	CR0LT,R4,R7,R9
+	SETB_CR0(R3)
+	BC	$12,30,LR	// beqlr cr7
+	BR	cmpbody<>(SB)
+
+TEXT runtime·cmpstring<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
+	// incoming:
+	// R3 a addr -> R5
+	// R4 a len  -> R3
+	// R5 b addr -> R6
+	// R6 b len  -> R4
+	//
+	// on entry to cmpbody:
+	// R3 compare value if compared length is same.
+	// R5 a addr
+	// R6 b addr
+	// R9 min(len(a),len(b))
+	SETB_INIT()
+	CMP	R4,R6,CR0
+	CMP	R3,R5,CR7
+	ISEL	CR0LT,R4,R6,R9
+	MOVD	R5,R6
+	MOVD	R3,R5
+	SETB_CR0(R3)
+	BC	$12,30,LR	// beqlr cr7
+	BR	cmpbody<>(SB)
+
+#ifdef GOARCH_ppc64le
+DATA byteswap<>+0(SB)/8, $0x0706050403020100
+DATA byteswap<>+8(SB)/8, $0x0f0e0d0c0b0a0908
+GLOBL byteswap<>+0(SB), RODATA, $16
+#define SWAP V21
+#endif
+
+TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0
+start:
+	CMP	R9,$16,CR0
+	CMP	R9,$32,CR1
+	CMP	R9,$64,CR2
+	MOVD	$16,R10
+	BLT	cmp8
+	BLT	CR1,cmp16
+	BLT	CR2,cmp32
+
+cmp64:	// >= 64B
+	DCBT	(R5)		// optimize for size>=64
+	DCBT	(R6)		// cache hint
+
+	SRD	$6,R9,R14	// There is at least one iteration.
+	MOVD	R14,CTR
+	ANDCC   $63,R9,R9
+	CMP	R9,$16,CR1	// Do setup for tail check early on.
+	CMP	R9,$32,CR2
+	CMP	R9,$48,CR3
+	ADD	$-16,R9,R9
+
+	MOVD	$32,R11		// set offsets to load into vector
+	MOVD	$48,R12		// set offsets to load into vector
+
+	PCALIGN	$16
+cmp64_loop:
+	LXVD2X	(R5)(R0),V3	// load bytes of A at offset 0 into vector
+	LXVD2X	(R6)(R0),V4	// load bytes of B at offset 0 into vector
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different	// jump out if its different
+
+	LXVD2X	(R5)(R10),V3	// load bytes of A at offset 16 into vector
+	LXVD2X	(R6)(R10),V4	// load bytes of B at offset 16 into vector
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R5)(R11),V3	// load bytes of A at offset 32 into vector
+	LXVD2X	(R6)(R11),V4	// load bytes of B at offset 32 into vector
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R5)(R12),V3	// load bytes of A at offset 64 into vector
+	LXVD2X	(R6)(R12),V4	// load bytes of B at offset 64 into vector
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	ADD	$64,R5,R5	// increment to next 64 bytes of A
+	ADD	$64,R6,R6	// increment to next 64 bytes of B
+	BDNZ	cmp64_loop
+	BC	$12,2,LR	// beqlr
+
+	// Finish out tail with minimal overlapped checking.
+	// Note, 0 tail is handled by beqlr above.
+	BLE	CR1,cmp64_tail_gt0
+	BLE	CR2,cmp64_tail_gt16
+	BLE	CR3,cmp64_tail_gt32
+
+cmp64_tail_gt48: // 49 - 63 B
+	LXVD2X	(R0)(R5),V3
+	LXVD2X	(R0)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R5)(R10),V3
+	LXVD2X	(R6)(R10),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R5)(R11),V3
+	LXVD2X	(R6)(R11),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	BR cmp64_tail_gt0
+
+	PCALIGN $16
+cmp64_tail_gt32: // 33 - 48B
+	LXVD2X	(R0)(R5),V3
+	LXVD2X	(R0)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R5)(R10),V3
+	LXVD2X	(R6)(R10),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	BR cmp64_tail_gt0
+
+	PCALIGN $16
+cmp64_tail_gt16: // 17 - 32B
+	LXVD2X	(R0)(R5),V3
+	LXVD2X	(R0)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	BR cmp64_tail_gt0
+
+	PCALIGN $16
+cmp64_tail_gt0: // 1 - 16B
+	LXVD2X	(R5)(R9),V3
+	LXVD2X	(R6)(R9),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	RET
+
+	PCALIGN $16
+cmp32:	// 32 - 63B
+	ANDCC	$31,R9,R9
+
+	LXVD2X	(R0)(R5),V3
+	LXVD2X	(R0)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R10)(R5),V3
+	LXVD2X	(R10)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	BC	$12,2,LR	// beqlr
+	ADD	R9,R10,R10
+
+	LXVD2X	(R9)(R5),V3
+	LXVD2X	(R9)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+
+	LXVD2X	(R10)(R5),V3
+	LXVD2X	(R10)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+	RET
+
+	PCALIGN $16
+cmp16:	// 16 - 31B
+	ANDCC	$15,R9,R9
+	LXVD2X	(R0)(R5),V3
+	LXVD2X	(R0)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+	BC	$12,2,LR	// beqlr
+
+	LXVD2X	(R9)(R5),V3
+	LXVD2X	(R9)(R6),V4
+	VCMPEQUDCC	V3,V4,V1
+	BGE	CR6,different
+	RET
+
+	PCALIGN $16
+different:
+#ifdef	GOARCH_ppc64le
+	MOVD	$byteswap<>+00(SB),R16
+	LXVD2X	(R16)(R0),SWAP	// Set up swap string
+
+	VPERM	V3,V3,SWAP,V3
+	VPERM	V4,V4,SWAP,V4
+#endif
+
+	MFVSRD	VS35,R16	// move upper doublewords of A and B into GPR for comparison
+	MFVSRD	VS36,R10
+
+	CMPU	R16,R10
+	BEQ	lower
+	SETB_CR0_NE(R3)
+	RET
+
+	PCALIGN $16
+lower:
+	VSLDOI	$8,V3,V3,V3	// move lower doublewords of A and B into GPR for comparison
+	MFVSRD	VS35,R16
+	VSLDOI	$8,V4,V4,V4
+	MFVSRD	VS36,R10
+
+	CMPU	R16,R10
+	SETB_CR0_NE(R3)
+	RET
+
+	PCALIGN $16
+cmp8:	// 8 - 15B
+	CMP	R9,$8
+	BLT	cmp4
+	ANDCC	$7,R9,R9
+	_LDBEX	(R0)(R5),R10
+	_LDBEX	(R0)(R6),R11
+	_LDBEX	(R9)(R5),R12
+	_LDBEX	(R9)(R6),R14
+	CMPU	R10,R11,CR0
+	SETB_CR0(R5)
+	CMPU	R12,R14,CR1
+	SETB_CR1(R6)
+	CRAND   CR0EQ,CR1EQ,CR1EQ // If both equal, length determines return value.
+	ISEL	CR0EQ,R6,R5,R4
+	ISEL	CR1EQ,R3,R4,R3
+	RET
+
+	PCALIGN	$16
+cmp4:	// 4 - 7B
+	CMP	R9,$4
+	BLT	cmp2
+	ANDCC	$3,R9,R9
+	_LWBEX	(R0)(R5),R10
+	_LWBEX	(R0)(R6),R11
+	_LWBEX	(R9)(R5),R12
+	_LWBEX	(R9)(R6),R14
+	RLDIMI	$32,R10,$0,R12
+	RLDIMI	$32,R11,$0,R14
+	CMPU	R12,R14
+	BR	cmp0
+
+	PCALIGN $16
+cmp2:	// 2 - 3B
+	CMP	R9,$2
+	BLT	cmp1
+	ANDCC	$1,R9,R9
+	_LHBEX	(R0)(R5),R10
+	_LHBEX	(R0)(R6),R11
+	_LHBEX	(R9)(R5),R12
+	_LHBEX	(R9)(R6),R14
+	RLDIMI	$32,R10,$0,R12
+	RLDIMI	$32,R11,$0,R14
+	CMPU	R12,R14
+	BR	cmp0
+
+	PCALIGN $16
+cmp1:
+	CMP	R9,$0
+	BEQ	cmp0
+	MOVBZ	(R5),R10
+	MOVBZ	(R6),R11
+	CMPU	R10,R11
+cmp0:
+	SETB_CR0(R6)
+	ISEL	CR0EQ,R3,R6,R3
+	RET