D28776.diff
No OneTemporary
Actions

Size

1 KB

Referenced Files

None

Subscribers

None

D28776.diff
View Options

	diff --git a/lib/libc/powerpc64/string/bcopy.S b/lib/libc/powerpc64/string/bcopy.S
	--- a/lib/libc/powerpc64/string/bcopy.S
	+++ b/lib/libc/powerpc64/string/bcopy.S
	@@ -34,6 +34,11 @@
	#define BLOCK_SIZE (1 << BLOCK_SIZE_BITS)
	#define BLOCK_SIZE_MASK (BLOCK_SIZE - 1)

	+/* Minimum 8 byte alignment, to avoid cache-inhibited alignment faults.*/
	+#ifndef ALIGN_MASK
	+#define ALIGN_MASK 0x7
	+#endif
	+
	#define MULTI_PHASE_THRESHOLD 512

	#ifndef FN_NAME
	@@ -66,9 +71,38 @@
	mr %r4, %r0
	#endif

	+ /* First check for relative alignment, if unaligned copy one byte at a time */
	+ andi. %r8, %r3, ALIGN_MASK
	+ andi. %r7, %r4, ALIGN_MASK
	+ cmpd %r7, %r8
	+ bne .Lunaligned
	+
	+
	cmpldi %r5, MULTI_PHASE_THRESHOLD
	bge .Lmulti_phase
	+ b .Lfast_copy
	+
	+.Lunaligned:
	+ /* forward or backward copy? */
	+ cmpd %r4, %r3
	+ blt .Lbackward_unaligned
	+
	+ /* Just need to setup increment and jump to copy */
	+ li %r0, 1
	+ mtctr %r5
	+ b .Lsingle_1_loop
	+
	+.Lbackward_unaligned:
	+ /* advance src and dst to last byte, set decrement and jump to copy */
	+ add %r3, %r3, %r5
	+ addi %r3, %r3, -1
	+ add %r4, %r4, %r5
	+ addi %r4, %r4, -1
	+ li %r0, -1
	+ mtctr %r5
	+ b .Lsingle_1_loop

	+.Lfast_copy:
	/* align src */
	cmpd %r4, %r3 /* forward or backward copy? */
	blt .Lbackward_align