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-rw-r--r--src/gallium/drivers/llvmpipe/lp_bld_logic.c394
1 files changed, 394 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_logic.c b/src/gallium/drivers/llvmpipe/lp_bld_logic.c
new file mode 100644
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+++ b/src/gallium/drivers/llvmpipe/lp_bld_logic.c
@@ -0,0 +1,394 @@
+/**************************************************************************
+ *
+ * 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 logical operations.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+
+#include "lp_bld_type.h"
+#include "lp_bld_const.h"
+#include "lp_bld_intr.h"
+#include "lp_bld_logic.h"
+
+
+LLVMValueRef
+lp_build_cmp(struct lp_build_context *bld,
+ unsigned func,
+ LLVMValueRef a,
+ LLVMValueRef b)
+{
+ const union lp_type type = bld->type;
+ LLVMTypeRef vec_type = lp_build_vec_type(type);
+ LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
+ LLVMValueRef zeros = LLVMConstNull(int_vec_type);
+ LLVMValueRef ones = LLVMConstAllOnes(int_vec_type);
+ LLVMValueRef cond;
+ LLVMValueRef res;
+ unsigned i;
+
+ if(func == PIPE_FUNC_NEVER)
+ return zeros;
+ if(func == PIPE_FUNC_ALWAYS)
+ return ones;
+
+ /* TODO: optimize the constant case */
+
+ /* XXX: It is not clear if we should use the ordered or unordered operators */
+
+#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
+ if(type.width * type.length == 128) {
+ if(type.floating) {
+ LLVMValueRef args[3];
+ unsigned cc;
+ boolean swap;
+
+ swap = FALSE;
+ switch(func) {
+ case PIPE_FUNC_EQUAL:
+ cc = 0;
+ break;
+ case PIPE_FUNC_NOTEQUAL:
+ cc = 4;
+ break;
+ case PIPE_FUNC_LESS:
+ cc = 1;
+ break;
+ case PIPE_FUNC_LEQUAL:
+ cc = 2;
+ break;
+ case PIPE_FUNC_GREATER:
+ cc = 1;
+ swap = TRUE;
+ break;
+ case PIPE_FUNC_GEQUAL:
+ cc = 2;
+ swap = TRUE;
+ break;
+ default:
+ assert(0);
+ return bld->undef;
+ }
+
+ if(swap) {
+ args[0] = b;
+ args[1] = a;
+ }
+ else {
+ args[0] = a;
+ args[1] = b;
+ }
+
+ args[2] = LLVMConstInt(LLVMInt8Type(), cc, 0);
+ res = lp_build_intrinsic(bld->builder,
+ "llvm.x86.sse.cmp.ps",
+ vec_type,
+ args, 3);
+ res = LLVMBuildBitCast(bld->builder, res, int_vec_type, "");
+ return res;
+ }
+ else {
+ static const struct {
+ unsigned swap:1;
+ unsigned eq:1;
+ unsigned gt:1;
+ unsigned not:1;
+ } table[] = {
+ {0, 0, 0, 1}, /* PIPE_FUNC_NEVER */
+ {1, 0, 1, 0}, /* PIPE_FUNC_LESS */
+ {0, 1, 0, 0}, /* PIPE_FUNC_EQUAL */
+ {0, 0, 1, 1}, /* PIPE_FUNC_LEQUAL */
+ {0, 0, 1, 0}, /* PIPE_FUNC_GREATER */
+ {0, 1, 0, 1}, /* PIPE_FUNC_NOTEQUAL */
+ {1, 0, 1, 1}, /* PIPE_FUNC_GEQUAL */
+ {0, 0, 0, 0} /* PIPE_FUNC_ALWAYS */
+ };
+ const char *pcmpeq;
+ const char *pcmpgt;
+ LLVMValueRef args[2];
+ LLVMValueRef res;
+
+ switch (type.width) {
+ case 8:
+ pcmpeq = "llvm.x86.sse2.pcmpeq.b";
+ pcmpgt = "llvm.x86.sse2.pcmpgt.b";
+ break;
+ case 16:
+ pcmpeq = "llvm.x86.sse2.pcmpeq.w";
+ pcmpgt = "llvm.x86.sse2.pcmpgt.w";
+ break;
+ case 32:
+ pcmpeq = "llvm.x86.sse2.pcmpeq.d";
+ pcmpgt = "llvm.x86.sse2.pcmpgt.d";
+ break;
+ default:
+ assert(0);
+ return bld->undef;
+ }
+
+ /* There are no signed byte and unsigned word/dword comparison
+ * instructions. So flip the sign bit so that the results match.
+ */
+ if(table[func].gt &&
+ ((type.width == 8 && type.sign) ||
+ (type.width != 8 && !type.sign))) {
+ LLVMValueRef msb = lp_build_int_const_scalar(type, (unsigned long long)1 << (type.width - 1));
+ a = LLVMBuildXor(bld->builder, a, msb, "");
+ b = LLVMBuildXor(bld->builder, b, msb, "");
+ }
+
+ if(table[func].swap) {
+ args[0] = b;
+ args[1] = a;
+ }
+ else {
+ args[0] = a;
+ args[1] = b;
+ }
+
+ if(table[func].eq)
+ res = lp_build_intrinsic(bld->builder, pcmpeq, vec_type, args, 2);
+ else if (table[func].gt)
+ res = lp_build_intrinsic(bld->builder, pcmpgt, vec_type, args, 2);
+ else
+ res = LLVMConstNull(vec_type);
+
+ if(table[func].not)
+ res = LLVMBuildNot(bld->builder, res, "");
+
+ return res;
+ }
+ }
+#endif
+
+ if(type.floating) {
+ LLVMRealPredicate op;
+ switch(func) {
+ case PIPE_FUNC_NEVER:
+ op = LLVMRealPredicateFalse;
+ break;
+ case PIPE_FUNC_ALWAYS:
+ op = LLVMRealPredicateTrue;
+ break;
+ case PIPE_FUNC_EQUAL:
+ op = LLVMRealUEQ;
+ break;
+ case PIPE_FUNC_NOTEQUAL:
+ op = LLVMRealUNE;
+ break;
+ case PIPE_FUNC_LESS:
+ op = LLVMRealULT;
+ break;
+ case PIPE_FUNC_LEQUAL:
+ op = LLVMRealULE;
+ break;
+ case PIPE_FUNC_GREATER:
+ op = LLVMRealUGT;
+ break;
+ case PIPE_FUNC_GEQUAL:
+ op = LLVMRealUGE;
+ break;
+ default:
+ assert(0);
+ return bld->undef;
+ }
+
+#if 0
+ /* XXX: Although valid IR, no LLVM target currently support this */
+ cond = LLVMBuildFCmp(bld->builder, op, a, b, "");
+ res = LLVMBuildSelect(bld->builder, cond, ones, zeros, "");
+#else
+ debug_printf("%s: warning: using slow element-wise vector comparison\n",
+ __FUNCTION__);
+ res = LLVMGetUndef(int_vec_type);
+ for(i = 0; i < type.length; ++i) {
+ LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
+ cond = LLVMBuildFCmp(bld->builder, op,
+ LLVMBuildExtractElement(bld->builder, a, index, ""),
+ LLVMBuildExtractElement(bld->builder, b, index, ""),
+ "");
+ cond = LLVMBuildSelect(bld->builder, cond,
+ LLVMConstExtractElement(ones, index),
+ LLVMConstExtractElement(zeros, index),
+ "");
+ res = LLVMBuildInsertElement(bld->builder, res, cond, index, "");
+ }
+#endif
+ }
+ else {
+ LLVMIntPredicate op;
+ switch(func) {
+ case PIPE_FUNC_EQUAL:
+ op = LLVMIntEQ;
+ break;
+ case PIPE_FUNC_NOTEQUAL:
+ op = LLVMIntNE;
+ break;
+ case PIPE_FUNC_LESS:
+ op = type.sign ? LLVMIntSLT : LLVMIntULT;
+ break;
+ case PIPE_FUNC_LEQUAL:
+ op = type.sign ? LLVMIntSLE : LLVMIntULE;
+ break;
+ case PIPE_FUNC_GREATER:
+ op = type.sign ? LLVMIntSGT : LLVMIntUGT;
+ break;
+ case PIPE_FUNC_GEQUAL:
+ op = type.sign ? LLVMIntSGE : LLVMIntUGE;
+ break;
+ default:
+ assert(0);
+ return bld->undef;
+ }
+
+#if 0
+ /* XXX: Although valid IR, no LLVM target currently support this */
+ cond = LLVMBuildICmp(bld->builder, op, a, b, "");
+ res = LLVMBuildSelect(bld->builder, cond, ones, zeros, "");
+#else
+ debug_printf("%s: warning: using slow element-wise vector comparison\n",
+ __FUNCTION__);
+ res = LLVMGetUndef(int_vec_type);
+ for(i = 0; i < type.length; ++i) {
+ LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0);
+ cond = LLVMBuildICmp(bld->builder, op,
+ LLVMBuildExtractElement(bld->builder, a, index, ""),
+ LLVMBuildExtractElement(bld->builder, b, index, ""),
+ "");
+ cond = LLVMBuildSelect(bld->builder, cond,
+ LLVMConstExtractElement(ones, index),
+ LLVMConstExtractElement(zeros, index),
+ "");
+ res = LLVMBuildInsertElement(bld->builder, res, cond, index, "");
+ }
+#endif
+ }
+
+ return res;
+}
+
+
+LLVMValueRef
+lp_build_select(struct lp_build_context *bld,
+ LLVMValueRef mask,
+ LLVMValueRef a,
+ LLVMValueRef b)
+{
+ union lp_type type = bld->type;
+ LLVMValueRef res;
+
+ if(a == b)
+ return a;
+
+ if(type.floating) {
+ LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
+ a = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
+ b = LLVMBuildBitCast(bld->builder, b, int_vec_type, "");
+ }
+
+ a = LLVMBuildAnd(bld->builder, a, mask, "");
+
+ /* This often gets translated to PANDN, but sometimes the NOT is
+ * pre-computed and stored in another constant. The best strategy depends
+ * on available registers, so it is not a big deal -- hopefully LLVM does
+ * the right decision attending the rest of the program.
+ */
+ b = LLVMBuildAnd(bld->builder, b, LLVMBuildNot(bld->builder, mask, ""), "");
+
+ res = LLVMBuildOr(bld->builder, a, b, "");
+
+ if(type.floating) {
+ LLVMTypeRef vec_type = lp_build_vec_type(type);
+ res = LLVMBuildBitCast(bld->builder, res, vec_type, "");
+ }
+
+ return res;
+}
+
+
+LLVMValueRef
+lp_build_select_aos(struct lp_build_context *bld,
+ LLVMValueRef a,
+ LLVMValueRef b,
+ boolean cond[4])
+{
+ const union lp_type type = bld->type;
+ const unsigned n = type.length;
+ unsigned i, j;
+
+ if(a == b)
+ return a;
+ if(cond[0] && cond[1] && cond[2] && cond[3])
+ return a;
+ if(!cond[0] && !cond[1] && !cond[2] && !cond[3])
+ return b;
+ if(a == bld->undef || b == bld->undef)
+ return bld->undef;
+
+ /*
+ * There are three major ways of accomplishing this:
+ * - with a shuffle,
+ * - with a select,
+ * - or with a bit mask.
+ *
+ * Select isn't supported for vector types yet.
+ * The flip between these is empirical and might need to be.
+ */
+ 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, (cond[i] ? 0 : n) + j + i, 0);
+
+ return LLVMBuildShuffleVector(bld->builder, a, b, LLVMConstVector(shuffles, n), "");
+ }
+ else {
+#if 0
+ /* XXX: Unfortunately select of vectors do not work */
+ /* Use a select */
+ LLVMTypeRef elem_type = LLVMInt1Type();
+ LLVMValueRef cond[LP_MAX_VECTOR_LENGTH];
+
+ for(j = 0; j < n; j += 4)
+ for(i = 0; i < 4; ++i)
+ cond[j + i] = LLVMConstInt(elem_type, cond[i] ? 1 : 0, 0);
+
+ return LLVMBuildSelect(bld->builder, LLVMConstVector(cond, n), a, b, "");
+#else
+ LLVMValueRef mask = lp_build_const_mask_aos(type, cond);
+ return lp_build_select(bld, mask, a, b);
+#endif
+ }
+}
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