OpenBLAS/kernel/power/exfunc.S

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#define ASSEMBLER
#include "common.h"

	.machine "any"

	.globl	.rpcc
.rpcc:
	mftb	r3
	rlinm	r3, r3, 3, 0, 31	# ldc(scaling)
	bcr	BO_ALWAYS,CR0_LT

	.globl	.blas_lock
.blas_lock:
	cal	r7, 1(r0)
LL(0):
	l	r6, 0(r3)
	cmpi	CR0, r6, 0
	bne	LL(2)
	lwarx	r6, r0, r3
	cmpwi	CR6, r6, 0
	bne	LL(2)
	stwcx.	r7, r0, r3
	bne-	LL(0)
LL(1):
	bcr	BO_ALWAYS,CR0_LT

LL(2):
	b	LL(0)