Adding upstream version 1.16.10.upstream/1.16.10upstream

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

1 files changed, 165 insertions, 0 deletions

diff --git a/src/runtime/memclr_ppc64x.s b/src/runtime/memclr_ppc64x.s
new file mode 100644
index 0000000..7512620
--- /dev/null
+++ b/src/runtime/memclr_ppc64x.s
@@ -0,0 +1,165 @@
+// Copyright 2014 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.
+
+// +build ppc64 ppc64le
+
+#include "textflag.h"
+
+// See memclrNoHeapPointers Go doc for important implementation constraints.
+
+// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
+TEXT runtime·memclrNoHeapPointers(SB), NOSPLIT|NOFRAME, $0-16
+	MOVD ptr+0(FP), R3
+	MOVD n+8(FP), R4
+
+	// Determine if there are doublewords to clear
+check:
+	ANDCC $7, R4, R5  // R5: leftover bytes to clear
+	SRD   $3, R4, R6  // R6: double words to clear
+	CMP   R6, $0, CR1 // CR1[EQ] set if no double words
+
+	BC    12, 6, nozerolarge // only single bytes
+	CMP   R4, $512
+	BLT   under512           // special case for < 512
+	ANDCC $127, R3, R8       // check for 128 alignment of address
+	BEQ   zero512setup
+
+	ANDCC $7, R3, R15
+	BEQ   zero512xsetup // at least 8 byte aligned
+
+	// zero bytes up to 8 byte alignment
+
+	ANDCC $1, R3, R15 // check for byte alignment
+	BEQ   byte2
+	MOVB  R0, 0(R3)   // zero 1 byte
+	ADD   $1, R3      // bump ptr by 1
+	ADD   $-1, R4
+
+byte2:
+	ANDCC $2, R3, R15 // check for 2 byte alignment
+	BEQ   byte4
+	MOVH  R0, 0(R3)   // zero 2 bytes
+	ADD   $2, R3      // bump ptr by 2
+	ADD   $-2, R4
+
+byte4:
+	ANDCC $4, R3, R15   // check for 4 byte alignment
+	BEQ   zero512xsetup
+	MOVW  R0, 0(R3)     // zero 4 bytes
+	ADD   $4, R3        // bump ptr by 4
+	ADD   $-4, R4
+	BR    zero512xsetup // ptr should now be 8 byte aligned
+
+under512:
+	MOVD  R6, CTR     // R6 = number of double words
+	SRDCC $2, R6, R7  // 32 byte chunks?
+	BNE   zero32setup
+
+	// Clear double words
+
+zero8:
+	MOVD R0, 0(R3)    // double word
+	ADD  $8, R3
+	ADD  $-8, R4
+	BC   16, 0, zero8 // dec ctr, br zero8 if ctr not 0
+	BR   nozerolarge  // handle leftovers
+
+	// Prepare to clear 32 bytes at a time.
+
+zero32setup:
+	DCBTST (R3)             // prepare data cache
+	XXLXOR VS32, VS32, VS32 // clear VS32 (V0)
+	MOVD   R7, CTR          // number of 32 byte chunks
+	MOVD   $16, R8
+
+zero32:
+	STXVD2X VS32, (R3+R0)   // store 16 bytes
+	STXVD2X VS32, (R3+R8)
+	ADD     $32, R3
+	ADD     $-32, R4
+	BC      16, 0, zero32   // dec ctr, br zero32 if ctr not 0
+	RLDCLCC $61, R4, $3, R6 // remaining doublewords
+	BEQ     nozerolarge
+	MOVD    R6, CTR         // set up the CTR for doublewords
+	BR      zero8
+
+nozerolarge:
+	ANDCC $7, R4, R5 // any remaining bytes
+	BC    4, 1, LR   // ble lr
+
+zerotail:
+	MOVD R5, CTR // set up to clear tail bytes
+
+zerotailloop:
+	MOVB R0, 0(R3)           // clear single bytes
+	ADD  $1, R3
+	BC   16, 0, zerotailloop // dec ctr, br zerotailloop if ctr not 0
+	RET
+
+zero512xsetup:  // 512 chunk with extra needed
+	ANDCC $8, R3, R11    // 8 byte alignment?
+	BEQ   zero512setup16
+	MOVD  R0, 0(R3)      // clear 8 bytes
+	ADD   $8, R3         // update ptr to next 8
+	ADD   $-8, R4        // dec count by 8
+
+zero512setup16:
+	ANDCC $127, R3, R14 // < 128 byte alignment
+	BEQ   zero512setup  // handle 128 byte alignment
+	MOVD  $128, R15
+	SUB   R14, R15, R14 // find increment to 128 alignment
+	SRD   $4, R14, R15  // number of 16 byte chunks
+
+zero512presetup:
+	MOVD   R15, CTR         // loop counter of 16 bytes
+	XXLXOR VS32, VS32, VS32 // clear VS32 (V0)
+
+zero512preloop:  // clear up to 128 alignment
+	STXVD2X VS32, (R3+R0)         // clear 16 bytes
+	ADD     $16, R3               // update ptr
+	ADD     $-16, R4              // dec count
+	BC      16, 0, zero512preloop
+
+zero512setup:  // setup for dcbz loop
+	CMP  R4, $512   // check if at least 512
+	BLT  remain
+	SRD  $9, R4, R8 // loop count for 512 chunks
+	MOVD R8, CTR    // set up counter
+	MOVD $128, R9   // index regs for 128 bytes
+	MOVD $256, R10
+	MOVD $384, R11
+
+zero512:
+	DCBZ (R3+R0)        // clear first chunk
+	DCBZ (R3+R9)        // clear second chunk
+	DCBZ (R3+R10)       // clear third chunk
+	DCBZ (R3+R11)       // clear fourth chunk
+	ADD  $512, R3
+	ADD  $-512, R4
+	BC   16, 0, zero512
+
+remain:
+	CMP  R4, $128  // check if 128 byte chunks left
+	BLT  smaller
+	DCBZ (R3+R0)   // clear 128
+	ADD  $128, R3
+	ADD  $-128, R4
+	BR   remain
+
+smaller:
+	ANDCC $127, R4, R7 // find leftovers
+	BEQ   done
+	CMP   R7, $64      // more than 64, do 32 at a time
+	BLT   zero8setup   // less than 64, do 8 at a time
+	SRD   $5, R7, R7   // set up counter for 32
+	BR    zero32setup
+
+zero8setup:
+	SRDCC $3, R7, R7  // less than 8 bytes
+	BEQ   nozerolarge
+	MOVD  R7, CTR
+	BR    zero8
+
+done:
+	RET