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Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_swizzle.c')
-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_swizzle.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_swizzle.c b/src/gallium/drivers/llvmpipe/lp_bld_swizzle.c
new file mode 100644
index 0000000000..ac7eed9379
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_swizzle.c
@@ -0,0 +1,238 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Helper functions for swizzling/shuffling.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+
+#include "util/u_debug.h"
+
+#include "lp_bld_type.h"
+#include "lp_bld_const.h"
+#include "lp_bld_logic.h"
+#include "lp_bld_swizzle.h"
+
+
+LLVMValueRef
+lp_build_broadcast(LLVMBuilderRef builder,
+ LLVMTypeRef vec_type,
+ LLVMValueRef scalar)
+{
+ const unsigned n = LLVMGetVectorSize(vec_type);
+ LLVMValueRef res;
+ unsigned i;
+
+ res = LLVMGetUndef(vec_type);
+ for(i = 0; i < n; ++i) {
+ LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
+ res = LLVMBuildInsertElement(builder, res, scalar, index, "");
+ }
+
+ return res;
+}
+
+
+LLVMValueRef
+lp_build_broadcast_scalar(struct lp_build_context *bld,
+ LLVMValueRef scalar)
+{
+ const union lp_type type = bld->type;
+ LLVMValueRef res;
+ unsigned i;
+
+ res = bld->undef;
+ for(i = 0; i < type.length; ++i) {
+ LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
+ res = LLVMBuildInsertElement(bld->builder, res, scalar, index, "");
+ }
+
+ return res;
+}
+
+
+LLVMValueRef
+lp_build_broadcast_aos(struct lp_build_context *bld,
+ LLVMValueRef a,
+ unsigned channel)
+{
+ const union lp_type type = bld->type;
+ const unsigned n = type.length;
+ unsigned i, j;
+
+ if(a == bld->undef || a == bld->zero || a == bld->one)
+ return a;
+
+ /* XXX: SSE3 has PSHUFB which should be better than bitmasks, but forcing
+ * using shuffles here actually causes worst results. More investigation is
+ * needed. */
+ if (n <= 4) {
+ /*
+ * Shuffle.
+ */
+ LLVMTypeRef elem_type = LLVMInt32Type();
+ LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH];
+
+ for(j = 0; j < n; j += 4)
+ for(i = 0; i < 4; ++i)
+ shuffles[j + i] = LLVMConstInt(elem_type, j + channel, 0);
+
+ return LLVMBuildShuffleVector(bld->builder, a, bld->undef, LLVMConstVector(shuffles, n), "");
+ }
+ else {
+ /*
+ * Bit mask and recursive shifts
+ *
+ * XYZW XYZW .... XYZW <= input
+ * 0Y00 0Y00 .... 0Y00
+ * YY00 YY00 .... YY00
+ * YYYY YYYY .... YYYY <= output
+ */
+ union lp_type type4 = type;
+ const char shifts[4][2] = {
+ { 1, 2},
+ {-1, 2},
+ { 1, -2},
+ {-1, -2}
+ };
+ boolean cond[4];
+ unsigned i;
+
+ memset(cond, 0, sizeof cond);
+ cond[channel] = 1;
+
+ a = LLVMBuildAnd(bld->builder, a, lp_build_const_mask_aos(type, cond), "");
+
+ type4.width *= 4;
+ type4.length /= 4;
+
+ a = LLVMBuildBitCast(bld->builder, a, lp_build_vec_type(type4), "");
+
+ for(i = 0; i < 2; ++i) {
+ LLVMValueRef tmp = NULL;
+ int shift = shifts[channel][i];
+
+#ifdef PIPE_ARCH_LITTLE_ENDIAN
+ shift = -shift;
+#endif
+
+ if(shift > 0)
+ tmp = LLVMBuildLShr(bld->builder, a, lp_build_int_const_scalar(type4, shift*type.width), "");
+ if(shift < 0)
+ tmp = LLVMBuildShl(bld->builder, a, lp_build_int_const_scalar(type4, -shift*type.width), "");
+
+ assert(tmp);
+ if(tmp)
+ a = LLVMBuildOr(bld->builder, a, tmp, "");
+ }
+
+ return LLVMBuildBitCast(bld->builder, a, lp_build_vec_type(type), "");
+ }
+}
+
+
+LLVMValueRef
+lp_build_swizzle1_aos(struct lp_build_context *bld,
+ LLVMValueRef a,
+ unsigned char swizzle[4])
+{
+ const unsigned n = bld->type.length;
+ unsigned i, j;
+
+ if(a == bld->undef || a == bld->zero || a == bld->one)
+ return a;
+
+ if(swizzle[0] == swizzle[1] && swizzle[1] == swizzle[2] && swizzle[2] == swizzle[3])
+ return lp_build_broadcast_aos(bld, a, swizzle[0]);
+
+ {
+ /*
+ * Shuffle.
+ */
+ LLVMTypeRef elem_type = LLVMInt32Type();
+ LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH];
+
+ for(j = 0; j < n; j += 4)
+ for(i = 0; i < 4; ++i)
+ shuffles[j + i] = LLVMConstInt(elem_type, j + swizzle[i], 0);
+
+ return LLVMBuildShuffleVector(bld->builder, a, bld->undef, LLVMConstVector(shuffles, n), "");
+ }
+}
+
+
+LLVMValueRef
+lp_build_swizzle2_aos(struct lp_build_context *bld,
+ LLVMValueRef a,
+ LLVMValueRef b,
+ unsigned char swizzle[4])
+{
+ const unsigned n = bld->type.length;
+ unsigned i, j;
+
+ if(swizzle[0] < 4 && swizzle[1] < 4 && swizzle[2] < 4 && swizzle[3] < 4)
+ return lp_build_swizzle1_aos(bld, a, swizzle);
+
+ if(a == b) {
+ swizzle[0] %= 4;
+ swizzle[1] %= 4;
+ swizzle[2] %= 4;
+ swizzle[3] %= 4;
+ return lp_build_swizzle1_aos(bld, a, swizzle);
+ }
+
+ if(swizzle[0] % 4 == 0 &&
+ swizzle[1] % 4 == 1 &&
+ swizzle[2] % 4 == 2 &&
+ swizzle[3] % 4 == 3) {
+ boolean cond[4];
+ cond[0] = swizzle[0] / 4;
+ cond[1] = swizzle[1] / 4;
+ cond[2] = swizzle[2] / 4;
+ cond[3] = swizzle[3] / 4;
+ return lp_build_select_aos(bld, a, b, cond);
+ }
+
+ {
+ /*
+ * Shuffle.
+ */
+ LLVMTypeRef elem_type = LLVMInt32Type();
+ LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH];
+
+ for(j = 0; j < n; j += 4)
+ for(i = 0; i < 4; ++i)
+ shuffles[j + i] = LLVMConstInt(elem_type, j + (swizzle[i] % 4) + (swizzle[i] / 4 * n), 0);
+
+ return LLVMBuildShuffleVector(bld->builder, a, b, LLVMConstVector(shuffles, n), "");
+ }
+}
+
+
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