1 files changed, 178 insertions, 0 deletions
diff --git a/volk/spu_lib/spu_16s_vector_subtract_unaligned.c b/volk/spu_lib/spu_16s_vector_subtract_unaligned.c
new file mode 100644
index 000000000..a3ce6c2fe
--- /dev/null
+++ b/volk/spu_lib/spu_16s_vector_subtract_unaligned.c
@@ -0,0 +1,178 @@
+#include<spu_intrinsics.h>
+
+void* libvector_16s_vector_subtract_unaligned(void* target,  void* src0, void* src1, unsigned int num_bytes){
+	//loop iterator i
+	int i = 0;
+	void* retval = target;
+	
+
+	//put the target and source addresses into qwords
+	vector unsigned int address_counter_tgt = {(unsigned int)target, 0, 0, 0};
+	vector unsigned int address_counter_src0 = {(unsigned int)src0, 0, 0 ,0};
+	vector unsigned int address_counter_src1 = {(unsigned int)src1, 0, 0, 0};
+	
+	//create shuffle masks
+	
+	//shuffle mask building blocks:
+	//all from the first vector
+	vector unsigned char oneup = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+								  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};
+	//all from the second vector
+	vector unsigned char second_oneup = {0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+										 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f};
+	
+
+	
+	//gamma: second half of the second, first half of the first, break at (unsigned int)src0%16
+	vector unsigned char src_cmp = spu_splats((unsigned char)((unsigned int)src0%16));
+	vector unsigned char gt_res = spu_cmpgt(oneup, src_cmp);
+	vector unsigned char eq_res = spu_cmpeq(oneup, src_cmp);
+	vector unsigned char cmp_res = spu_or(gt_res, eq_res);
+	vector unsigned char sixteen_uchar = spu_splats((unsigned char)16);
+	vector unsigned char phase_change = spu_and(sixteen_uchar, cmp_res);
+	vector unsigned int shuffle_mask_gamma = spu_add((vector unsigned int)phase_change, 
+												 (vector unsigned int)oneup);
+	shuffle_mask_gamma = spu_rlqwbyte(shuffle_mask_gamma, (unsigned int)src0%16);
+
+	//eta: second half of the second, first half of the first, break at (unsigned int)src1%16
+	src_cmp = spu_splats((unsigned char)((unsigned int)src1%16));
+	gt_res = spu_cmpgt(oneup, src_cmp);
+	eq_res = spu_cmpeq(oneup, src_cmp);
+	cmp_res = spu_or(gt_res, eq_res);
+	sixteen_uchar = spu_splats((unsigned char)16);
+	phase_change = spu_and(sixteen_uchar, cmp_res);
+	vector unsigned int shuffle_mask_eta = spu_add((vector unsigned int)phase_change, 
+												 (vector unsigned int)oneup);
+	shuffle_mask_eta = spu_rlqwbyte(shuffle_mask_eta, (unsigned int)src1%16);
+	
+
+	
+	
+
+	vector unsigned char tgt_second = spu_rlqwbyte(second_oneup, -((unsigned int)target%16));
+	vector unsigned char tgt_first = spu_rlqwbyte(oneup, -((unsigned int)target%16));
+	
+	//alpha: first half of first, second half of second, break at (unsigned int)target%16
+	src_cmp = spu_splats((unsigned char)((unsigned int)target%16));
+	gt_res = spu_cmpgt(oneup, src_cmp);
+	eq_res = spu_cmpeq(oneup, src_cmp);
+	cmp_res = spu_or(gt_res, eq_res);
+	phase_change = spu_and(sixteen_uchar, cmp_res);
+	vector unsigned int shuffle_mask_alpha = spu_add((vector unsigned int)phase_change,
+													 (vector unsigned int)oneup);
+	
+	//delta: first half of first, first half of second, break at (unsigned int)target%16
+	vector unsigned char shuffle_mask_delta = spu_shuffle(oneup, tgt_second, (vector unsigned char)shuffle_mask_alpha);
+	//epsilon: second half of second, second half of first, break at (unsigned int)target%16
+	vector unsigned char shuffle_mask_epsilon = spu_shuffle(tgt_second, oneup, (vector unsigned char)shuffle_mask_alpha);
+	//zeta: second half of second, first half of first, break at 16 - (unsigned int)target%16
+	vector unsigned int shuffle_mask_zeta = spu_rlqwbyte(shuffle_mask_alpha, (unsigned int)target%16); 
+
+	//beta: first half of first, second half of second, break at num_bytes%16
+	src_cmp = spu_splats((unsigned char)(num_bytes%16));
+	gt_res = spu_cmpgt(oneup, src_cmp);
+	eq_res = spu_cmpeq(oneup, src_cmp);
+	cmp_res = spu_or(gt_res, eq_res);
+	phase_change = spu_and(sixteen_uchar, cmp_res);
+	vector unsigned int shuffle_mask_beta = spu_add((vector unsigned int)phase_change,
+													 (vector unsigned int)oneup);
+	
+	
+	
+
+
+	
+	qword src0_past;
+	qword src0_present;
+	qword src1_past;
+	qword src1_present;
+	qword tgt_past;
+	qword tgt_present;
+	
+	qword in_temp0;
+	qword in_temp1;
+	qword out_temp0;
+	qword out_temp1;
+
+    vector signed short sum;
+
+	src0_past = si_lqd((qword)address_counter_src0, 0);
+	src1_past = si_lqd((qword)address_counter_src1, 0);
+	tgt_past = si_lqd((qword)address_counter_tgt, 0);
+	
+	for(i = 0; i < num_bytes/16; ++i) {
+		
+		src0_present = si_lqd((qword)address_counter_src0, 16);
+		src1_present = si_lqd((qword)address_counter_src1, 16);
+		tgt_present = si_lqd((qword)address_counter_tgt, 16);
+		
+		in_temp0 = spu_shuffle(src0_present, src0_past, (vector unsigned char)shuffle_mask_gamma);
+		in_temp1 = spu_shuffle(src1_present, src1_past, (vector unsigned char)shuffle_mask_eta);
+		
+		sum = spu_sub((vector signed short)in_temp0, (vector signed short)in_temp1);
+	   
+
+		out_temp0 = spu_shuffle(tgt_past, (qword)sum, shuffle_mask_delta);
+		out_temp1 = spu_shuffle(tgt_present, (qword)sum, shuffle_mask_epsilon);
+		
+		si_stqd(out_temp0, (qword)address_counter_tgt, 0);
+		si_stqd(out_temp1, (qword)address_counter_tgt, 16);
+		
+		tgt_past = out_temp1;
+		src0_past = src0_present;
+		src1_past = src1_present;
+		address_counter_src0 = spu_add(address_counter_src0, 16);
+		address_counter_src1 = spu_add(address_counter_src1, 16);
+		address_counter_tgt = spu_add(address_counter_tgt, 16);
+		
+		
+	}
+	
+	src0_present = si_lqd((qword)address_counter_src0, 16);
+	src1_present = si_lqd((qword)address_counter_src1, 16);
+	tgt_present = si_lqd((qword)address_counter_tgt, 16);
+	
+	
+	in_temp0 = spu_shuffle(src0_present, src0_past, (vector unsigned char) shuffle_mask_gamma);
+	in_temp1 = spu_shuffle(src1_present, src1_past, (vector unsigned char) shuffle_mask_eta);
+	sum = spu_sub((vector signed short)in_temp0, (vector signed short)in_temp1);
+	qword target_temp = spu_shuffle(tgt_present, tgt_past, (vector unsigned char) shuffle_mask_zeta);
+	qword meld = spu_shuffle((qword)sum, target_temp, (vector unsigned char)shuffle_mask_beta);
+
+	
+	
+	out_temp0 = spu_shuffle(tgt_past, meld, shuffle_mask_delta);
+	out_temp1 = spu_shuffle(tgt_present, meld, shuffle_mask_epsilon);
+	
+	si_stqd(out_temp0, (qword)address_counter_tgt, 0);
+	si_stqd(out_temp1, (qword)address_counter_tgt, 16);
+	
+	return retval;
+}
+
+
+
+/*
+int main(){
+
+	signed short pooh[48];
+	signed short bear[48];
+	signed short res[48];
+
+	int i = 0;
+	for(i = 0; i < 48; ++i){
+		pooh[i] = i;
+	}
+	for(i = 48; i < 96; ++i){
+		bear[i - 48] = i;
+	}
+
+	vector_subtract_16bit(res, &pooh[0], &bear[0], 48 * sizeof(signed short));
+
+	for(i = 0; i < 48; ++i) {
+		printf("%d, ", res[i]);
+	}
+	printf("\n");
+}
+*/
+