1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
31 * Helper functions for type conversions.
33 * We want to use the fastest type for a given computation whenever feasible.
34 * The other side of this is that we need to be able convert between several
35 * types accurately and efficiently.
37 * Conversion between types of different bit width is quite complex since a
39 * To remember there are a few invariants in type conversions:
41 * - register width must remain constant:
43 * src_type.width * src_type.length == dst_type.width * dst_type.length
45 * - total number of elements must remain constant:
47 * src_type.length * num_srcs == dst_type.length * num_dsts
49 * It is not always possible to do the conversion both accurately and
50 * efficiently, usually due to lack of adequate machine instructions. In these
51 * cases it is important not to cut shortcuts here and sacrifice accuracy, as
52 * there this functions can be used anywhere. In the future we might have a
53 * precision parameter which can gauge the accuracy vs efficiency compromise,
54 * but for now if the data conversion between two stages happens to be the
55 * bottleneck, then most likely should just avoid converting at all and run
56 * both stages with the same type.
58 * Make sure to run lp_test_conv unit test after any change to this file.
60 * @author Jose Fonseca <jfonseca@vmware.com>
64 #include "util/u_debug.h"
65 #include "util/u_math.h"
66 #include "util/u_half.h"
67 #include "util/u_cpu_detect.h"
69 #include "lp_bld_type.h"
70 #include "lp_bld_const.h"
71 #include "lp_bld_arit.h"
72 #include "lp_bld_bitarit.h"
73 #include "lp_bld_pack.h"
74 #include "lp_bld_conv.h"
75 #include "lp_bld_logic.h"
76 #include "lp_bld_intr.h"
77 #include "lp_bld_printf.h"
78 #include "lp_bld_format.h"
83 * Converts int16 half-float to float32
84 * Note this can be performed in 1 instruction if vcvtph2ps exists (f16c/cvt16)
85 * [llvm.x86.vcvtph2ps / _mm_cvtph_ps]
87 * @param src value to convert
91 lp_build_half_to_float(struct gallivm_state
*gallivm
,
94 LLVMBuilderRef builder
= gallivm
->builder
;
95 LLVMTypeRef src_type
= LLVMTypeOf(src
);
96 unsigned src_length
= LLVMGetTypeKind(src_type
) == LLVMVectorTypeKind
?
97 LLVMGetVectorSize(src_type
) : 1;
99 struct lp_type f32_type
= lp_type_float_vec(32, 32 * src_length
);
100 struct lp_type i32_type
= lp_type_int_vec(32, 32 * src_length
);
101 LLVMTypeRef int_vec_type
= lp_build_vec_type(gallivm
, i32_type
);
104 if (util_cpu_caps
.has_f16c
&&
105 (src_length
== 4 || src_length
== 8)) {
106 const char *intrinsic
= NULL
;
107 if (src_length
== 4) {
108 src
= lp_build_pad_vector(gallivm
, src
, 8);
109 intrinsic
= "llvm.x86.vcvtph2ps.128";
112 intrinsic
= "llvm.x86.vcvtph2ps.256";
114 return lp_build_intrinsic_unary(builder
, intrinsic
,
115 lp_build_vec_type(gallivm
, f32_type
), src
);
118 /* Convert int16 vector to int32 vector by zero ext (might generate bad code) */
119 h
= LLVMBuildZExt(builder
, src
, int_vec_type
, "");
120 return lp_build_smallfloat_to_float(gallivm
, f32_type
, h
, 10, 5, 0, true);
125 * Converts float32 to int16 half-float
126 * Note this can be performed in 1 instruction if vcvtps2ph exists (f16c/cvt16)
127 * [llvm.x86.vcvtps2ph / _mm_cvtps_ph]
129 * @param src value to convert
131 * Convert float32 to half floats, preserving Infs and NaNs,
132 * with rounding towards zero (trunc).
133 * XXX: For GL, would prefer rounding towards nearest(-even).
136 lp_build_float_to_half(struct gallivm_state
*gallivm
,
139 LLVMBuilderRef builder
= gallivm
->builder
;
140 LLVMTypeRef f32_vec_type
= LLVMTypeOf(src
);
141 unsigned length
= LLVMGetTypeKind(f32_vec_type
) == LLVMVectorTypeKind
142 ? LLVMGetVectorSize(f32_vec_type
) : 1;
143 struct lp_type i32_type
= lp_type_int_vec(32, 32 * length
);
144 struct lp_type i16_type
= lp_type_int_vec(16, 16 * length
);
148 * Note: Newer llvm versions (3.6 or so) support fptrunc to 16 bits
149 * directly, without any (x86 or generic) intrinsics.
150 * Albeit the rounding mode cannot be specified (and is undefined,
151 * though in practice on x86 seems to do nearest-even but it may
152 * be dependent on instruction set support), so is essentially
156 if (util_cpu_caps
.has_f16c
&&
157 (length
== 4 || length
== 8)) {
158 struct lp_type i168_type
= lp_type_int_vec(16, 16 * 8);
159 unsigned mode
= 3; /* same as LP_BUILD_ROUND_TRUNCATE */
160 LLVMTypeRef i32t
= LLVMInt32TypeInContext(gallivm
->context
);
161 const char *intrinsic
= NULL
;
163 intrinsic
= "llvm.x86.vcvtps2ph.128";
166 intrinsic
= "llvm.x86.vcvtps2ph.256";
168 result
= lp_build_intrinsic_binary(builder
, intrinsic
,
169 lp_build_vec_type(gallivm
, i168_type
),
170 src
, LLVMConstInt(i32t
, mode
, 0));
172 result
= lp_build_extract_range(gallivm
, result
, 0, 4);
177 result
= lp_build_float_to_smallfloat(gallivm
, i32_type
, src
, 10, 5, 0, true);
178 /* Convert int32 vector to int16 vector by trunc (might generate bad code) */
179 result
= LLVMBuildTrunc(builder
, result
, lp_build_vec_type(gallivm
, i16_type
), "");
186 LLVMTypeRef i32t
= LLVMInt32TypeInContext(gallivm
->context
);
187 LLVMTypeRef i16t
= LLVMInt16TypeInContext(gallivm
->context
);
188 LLVMTypeRef f32t
= LLVMFloatTypeInContext(gallivm
->context
);
189 LLVMValueRef ref_result
= LLVMGetUndef(LLVMVectorType(i16t
, length
));
192 LLVMTypeRef func_type
= LLVMFunctionType(i16t
, &f32t
, 1, 0);
193 LLVMValueRef func
= lp_build_const_int_pointer(gallivm
, func_to_pointer((func_pointer
)util_float_to_half
));
194 func
= LLVMBuildBitCast(builder
, func
, LLVMPointerType(func_type
, 0), "util_float_to_half");
196 for (i
= 0; i
< length
; ++i
) {
197 LLVMValueRef index
= LLVMConstInt(i32t
, i
, 0);
198 LLVMValueRef f32
= LLVMBuildExtractElement(builder
, src
, index
, "");
201 * XXX: not really supported by backends.
202 * Even if they would now, rounding mode cannot be specified and
205 LLVMValueRef f16
= lp_build_intrinsic_unary(builder
, "llvm.convert.to.fp16", i16t
, f32
);
207 LLVMValueRef f16
= LLVMBuildCall(builder
, func
, &f32
, 1, "");
209 ref_result
= LLVMBuildInsertElement(builder
, ref_result
, f16
, index
, "");
212 lp_build_print_value(gallivm
, "src = ", src
);
213 lp_build_print_value(gallivm
, "llvm = ", result
);
214 lp_build_print_value(gallivm
, "util = ", ref_result
);
215 lp_build_printf(gallivm
, "\n");
223 * Special case for converting clamped IEEE-754 floats to unsigned norms.
225 * The mathematical voodoo below may seem excessive but it is actually
226 * paramount we do it this way for several reasons. First, there is no single
227 * precision FP to unsigned integer conversion Intel SSE instruction. Second,
228 * secondly, even if there was, since the FP's mantissa takes only a fraction
229 * of register bits the typically scale and cast approach would require double
230 * precision for accurate results, and therefore half the throughput
232 * Although the result values can be scaled to an arbitrary bit width specified
233 * by dst_width, the actual result type will have the same width.
235 * Ex: src = { float, float, float, float }
236 * return { i32, i32, i32, i32 } where each value is in [0, 2^dst_width-1].
239 lp_build_clamped_float_to_unsigned_norm(struct gallivm_state
*gallivm
,
240 struct lp_type src_type
,
244 LLVMBuilderRef builder
= gallivm
->builder
;
245 LLVMTypeRef int_vec_type
= lp_build_int_vec_type(gallivm
, src_type
);
249 assert(src_type
.floating
);
250 assert(dst_width
<= src_type
.width
);
251 src_type
.sign
= FALSE
;
253 mantissa
= lp_mantissa(src_type
);
255 if (dst_width
<= mantissa
) {
257 * Apply magic coefficients that will make the desired result to appear
258 * in the lowest significant bits of the mantissa, with correct rounding.
260 * This only works if the destination width fits in the mantissa.
263 unsigned long long ubound
;
264 unsigned long long mask
;
268 ubound
= (1ULL << dst_width
);
270 scale
= (double)mask
/ubound
;
271 bias
= (double)(1ULL << (mantissa
- dst_width
));
273 res
= LLVMBuildFMul(builder
, src
, lp_build_const_vec(gallivm
, src_type
, scale
), "");
274 /* instead of fadd/and could (with sse2) just use lp_build_iround */
275 res
= LLVMBuildFAdd(builder
, res
, lp_build_const_vec(gallivm
, src_type
, bias
), "");
276 res
= LLVMBuildBitCast(builder
, res
, int_vec_type
, "");
277 res
= LLVMBuildAnd(builder
, res
,
278 lp_build_const_int_vec(gallivm
, src_type
, mask
), "");
280 else if (dst_width
== (mantissa
+ 1)) {
282 * The destination width matches exactly what can be represented in
283 * floating point (i.e., mantissa + 1 bits). Even so correct rounding
284 * still needs to be applied (only for numbers in [0.5-1.0] would
285 * conversion using truncation after scaling be sufficient).
288 struct lp_build_context uf32_bld
;
290 lp_build_context_init(&uf32_bld
, gallivm
, src_type
);
291 scale
= (double)((1ULL << dst_width
) - 1);
293 res
= LLVMBuildFMul(builder
, src
,
294 lp_build_const_vec(gallivm
, src_type
, scale
), "");
295 res
= lp_build_iround(&uf32_bld
, res
);
299 * The destination exceeds what can be represented in the floating point.
300 * So multiply by the largest power two we get away with, and when
301 * subtract the most significant bit to rescale to normalized values.
303 * The largest power of two factor we can get away is
304 * (1 << (src_type.width - 1)), because we need to use signed . In theory it
305 * should be (1 << (src_type.width - 2)), but IEEE 754 rules states
306 * INT_MIN should be returned in FPToSI, which is the correct result for
309 * This means we get (src_type.width - 1) correct bits for values near 0.0,
310 * and (mantissa + 1) correct bits for values near 1.0. Equally or more
311 * important, we also get exact results for 0.0 and 1.0.
314 unsigned n
= MIN2(src_type
.width
- 1u, dst_width
);
316 double scale
= (double)(1ULL << n
);
317 unsigned lshift
= dst_width
- n
;
319 LLVMValueRef lshifted
;
320 LLVMValueRef rshifted
;
322 res
= LLVMBuildFMul(builder
, src
,
323 lp_build_const_vec(gallivm
, src_type
, scale
), "");
324 res
= LLVMBuildFPToSI(builder
, res
, int_vec_type
, "");
327 * Align the most significant bit to its final place.
329 * This will cause 1.0 to overflow to 0, but the later adjustment will
333 lshifted
= LLVMBuildShl(builder
, res
,
334 lp_build_const_int_vec(gallivm
, src_type
,
341 * Align the most significant bit to the right.
343 rshifted
= LLVMBuildLShr(builder
, res
,
344 lp_build_const_int_vec(gallivm
, src_type
, rshift
),
348 * Subtract the MSB to the LSB, therefore re-scaling from
349 * (1 << dst_width) to ((1 << dst_width) - 1).
352 res
= LLVMBuildSub(builder
, lshifted
, rshifted
, "");
360 * Inverse of lp_build_clamped_float_to_unsigned_norm above.
361 * Ex: src = { i32, i32, i32, i32 } with values in range [0, 2^src_width-1]
362 * return {float, float, float, float} with values in range [0, 1].
365 lp_build_unsigned_norm_to_float(struct gallivm_state
*gallivm
,
367 struct lp_type dst_type
,
370 LLVMBuilderRef builder
= gallivm
->builder
;
371 LLVMTypeRef vec_type
= lp_build_vec_type(gallivm
, dst_type
);
372 LLVMTypeRef int_vec_type
= lp_build_int_vec_type(gallivm
, dst_type
);
377 unsigned long long ubound
;
378 unsigned long long mask
;
382 assert(dst_type
.floating
);
384 mantissa
= lp_mantissa(dst_type
);
386 if (src_width
<= (mantissa
+ 1)) {
388 * The source width matches fits what can be represented in floating
389 * point (i.e., mantissa + 1 bits). So do a straight multiplication
390 * followed by casting. No further rounding is necessary.
393 scale
= 1.0/(double)((1ULL << src_width
) - 1);
394 res
= LLVMBuildSIToFP(builder
, src
, vec_type
, "");
395 res
= LLVMBuildFMul(builder
, res
,
396 lp_build_const_vec(gallivm
, dst_type
, scale
), "");
401 * The source width exceeds what can be represented in floating
402 * point. So truncate the incoming values.
405 n
= MIN2(mantissa
, src_width
);
407 ubound
= ((unsigned long long)1 << n
);
409 scale
= (double)ubound
/mask
;
410 bias
= (double)((unsigned long long)1 << (mantissa
- n
));
414 if (src_width
> mantissa
) {
415 int shift
= src_width
- mantissa
;
416 res
= LLVMBuildLShr(builder
, res
,
417 lp_build_const_int_vec(gallivm
, dst_type
, shift
), "");
420 bias_
= lp_build_const_vec(gallivm
, dst_type
, bias
);
422 res
= LLVMBuildOr(builder
,
424 LLVMBuildBitCast(builder
, bias_
, int_vec_type
, ""), "");
426 res
= LLVMBuildBitCast(builder
, res
, vec_type
, "");
428 res
= LLVMBuildFSub(builder
, res
, bias_
, "");
429 res
= LLVMBuildFMul(builder
, res
, lp_build_const_vec(gallivm
, dst_type
, scale
), "");
437 * Pick a suitable num_dsts for lp_build_conv to ensure optimal cases are used.
439 * Returns the number of dsts created from src
441 int lp_build_conv_auto(struct gallivm_state
*gallivm
,
442 struct lp_type src_type
,
443 struct lp_type
* dst_type
,
444 const LLVMValueRef
*src
,
449 int num_dsts
= num_srcs
;
451 if (src_type
.floating
== dst_type
->floating
&&
452 src_type
.width
== dst_type
->width
&&
453 src_type
.length
== dst_type
->length
&&
454 src_type
.fixed
== dst_type
->fixed
&&
455 src_type
.norm
== dst_type
->norm
&&
456 src_type
.sign
== dst_type
->sign
)
459 /* Special case 4x4f -> 1x16ub or 2x8f -> 1x16ub
461 if (src_type
.floating
== 1 &&
462 src_type
.fixed
== 0 &&
463 src_type
.sign
== 1 &&
464 src_type
.norm
== 0 &&
465 src_type
.width
== 32 &&
467 dst_type
->floating
== 0 &&
468 dst_type
->fixed
== 0 &&
469 dst_type
->sign
== 0 &&
470 dst_type
->norm
== 1 &&
471 dst_type
->width
== 8)
473 /* Special case 4x4f --> 1x16ub */
474 if (src_type
.length
== 4 &&
475 (util_cpu_caps
.has_sse2
|| util_cpu_caps
.has_altivec
))
477 num_dsts
= (num_srcs
+ 3) / 4;
478 dst_type
->length
= num_srcs
* 4 >= 16 ? 16 : num_srcs
* 4;
480 lp_build_conv(gallivm
, src_type
, *dst_type
, src
, num_srcs
, dst
, num_dsts
);
484 /* Special case 2x8f --> 1x16ub */
485 if (src_type
.length
== 8 &&
486 util_cpu_caps
.has_avx
)
488 num_dsts
= (num_srcs
+ 1) / 2;
489 dst_type
->length
= num_srcs
* 8 >= 16 ? 16 : num_srcs
* 8;
491 lp_build_conv(gallivm
, src_type
, *dst_type
, src
, num_srcs
, dst
, num_dsts
);
496 /* lp_build_resize does not support M:N */
497 if (src_type
.width
== dst_type
->width
) {
498 lp_build_conv(gallivm
, src_type
, *dst_type
, src
, num_srcs
, dst
, num_dsts
);
500 for (i
= 0; i
< num_srcs
; ++i
) {
501 lp_build_conv(gallivm
, src_type
, *dst_type
, &src
[i
], 1, &dst
[i
], 1);
510 * Generic type conversion.
512 * TODO: Take a precision argument, or even better, add a new precision member
513 * to the lp_type union.
516 lp_build_conv(struct gallivm_state
*gallivm
,
517 struct lp_type src_type
,
518 struct lp_type dst_type
,
519 const LLVMValueRef
*src
, unsigned num_srcs
,
520 LLVMValueRef
*dst
, unsigned num_dsts
)
522 LLVMBuilderRef builder
= gallivm
->builder
;
523 struct lp_type tmp_type
;
524 LLVMValueRef tmp
[LP_MAX_VECTOR_LENGTH
];
528 /* We must not loose or gain channels. Only precision */
529 assert(src_type
.length
* num_srcs
== dst_type
.length
* num_dsts
);
531 assert(src_type
.length
<= LP_MAX_VECTOR_LENGTH
);
532 assert(dst_type
.length
<= LP_MAX_VECTOR_LENGTH
);
533 assert(num_srcs
<= LP_MAX_VECTOR_LENGTH
);
534 assert(num_dsts
<= LP_MAX_VECTOR_LENGTH
);
537 for(i
= 0; i
< num_srcs
; ++i
) {
538 assert(lp_check_value(src_type
, src
[i
]));
544 /* Special case 4x4f --> 1x16ub, 2x4f -> 1x8ub, 1x4f -> 1x4ub
546 if (src_type
.floating
== 1 &&
547 src_type
.fixed
== 0 &&
548 src_type
.sign
== 1 &&
549 src_type
.norm
== 0 &&
550 src_type
.width
== 32 &&
551 src_type
.length
== 4 &&
553 dst_type
.floating
== 0 &&
554 dst_type
.fixed
== 0 &&
555 dst_type
.sign
== 0 &&
556 dst_type
.norm
== 1 &&
557 dst_type
.width
== 8 &&
559 ((dst_type
.length
== 16 && 4 * num_dsts
== num_srcs
) ||
560 (num_dsts
== 1 && dst_type
.length
* num_srcs
== 16 && num_srcs
!= 3)) &&
562 (util_cpu_caps
.has_sse2
|| util_cpu_caps
.has_altivec
))
564 struct lp_build_context bld
;
565 struct lp_type int16_type
, int32_type
;
566 struct lp_type dst_type_ext
= dst_type
;
567 LLVMValueRef const_255f
;
570 lp_build_context_init(&bld
, gallivm
, src_type
);
572 dst_type_ext
.length
= 16;
573 int16_type
= int32_type
= dst_type_ext
;
575 int16_type
.width
*= 2;
576 int16_type
.length
/= 2;
579 int32_type
.width
*= 4;
580 int32_type
.length
/= 4;
583 const_255f
= lp_build_const_vec(gallivm
, src_type
, 255.0f
);
585 for (i
= 0; i
< num_dsts
; ++i
, src
+= 4) {
588 for (j
= 0; j
< dst_type
.length
/ 4; ++j
) {
589 tmp
[j
] = LLVMBuildFMul(builder
, src
[j
], const_255f
, "");
590 tmp
[j
] = lp_build_iround(&bld
, tmp
[j
]);
597 /* relying on clamping behavior of sse2 intrinsics here */
598 lo
= lp_build_pack2(gallivm
, int32_type
, int16_type
, tmp
[0], tmp
[1]);
604 hi
= lp_build_pack2(gallivm
, int32_type
, int16_type
, tmp
[2], tmp
[3]);
606 dst
[i
] = lp_build_pack2(gallivm
, int16_type
, dst_type_ext
, lo
, hi
);
609 dst
[0] = lp_build_extract_range(gallivm
, dst
[0], 0, dst_type
.length
);
615 /* Special case 2x8f --> 1x16ub, 1x8f ->1x8ub
617 else if (src_type
.floating
== 1 &&
618 src_type
.fixed
== 0 &&
619 src_type
.sign
== 1 &&
620 src_type
.norm
== 0 &&
621 src_type
.width
== 32 &&
622 src_type
.length
== 8 &&
624 dst_type
.floating
== 0 &&
625 dst_type
.fixed
== 0 &&
626 dst_type
.sign
== 0 &&
627 dst_type
.norm
== 1 &&
628 dst_type
.width
== 8 &&
630 ((dst_type
.length
== 16 && 2 * num_dsts
== num_srcs
) ||
631 (num_dsts
== 1 && dst_type
.length
* num_srcs
== 8)) &&
633 util_cpu_caps
.has_avx
) {
635 struct lp_build_context bld
;
636 struct lp_type int16_type
, int32_type
;
637 struct lp_type dst_type_ext
= dst_type
;
638 LLVMValueRef const_255f
;
641 lp_build_context_init(&bld
, gallivm
, src_type
);
643 dst_type_ext
.length
= 16;
644 int16_type
= int32_type
= dst_type_ext
;
646 int16_type
.width
*= 2;
647 int16_type
.length
/= 2;
650 int32_type
.width
*= 4;
651 int32_type
.length
/= 4;
654 const_255f
= lp_build_const_vec(gallivm
, src_type
, 255.0f
);
656 for (i
= 0; i
< num_dsts
; ++i
, src
+= 2) {
657 LLVMValueRef lo
, hi
, a
, b
;
659 a
= LLVMBuildFMul(builder
, src
[0], const_255f
, "");
660 a
= lp_build_iround(&bld
, a
);
661 tmp
[0] = lp_build_extract_range(gallivm
, a
, 0, 4);
662 tmp
[1] = lp_build_extract_range(gallivm
, a
, 4, 4);
663 /* relying on clamping behavior of sse2 intrinsics here */
664 lo
= lp_build_pack2(gallivm
, int32_type
, int16_type
, tmp
[0], tmp
[1]);
670 b
= LLVMBuildFMul(builder
, src
[1], const_255f
, "");
671 b
= lp_build_iround(&bld
, b
);
672 tmp
[2] = lp_build_extract_range(gallivm
, b
, 0, 4);
673 tmp
[3] = lp_build_extract_range(gallivm
, b
, 4, 4);
674 hi
= lp_build_pack2(gallivm
, int32_type
, int16_type
, tmp
[2], tmp
[3]);
677 dst
[i
] = lp_build_pack2(gallivm
, int16_type
, dst_type_ext
, lo
, hi
);
681 dst
[0] = lp_build_extract_range(gallivm
, dst
[0], 0, dst_type
.length
);
687 /* Special case -> 16bit half-float
689 else if (dst_type
.floating
&& dst_type
.width
== 16)
691 /* Only support src as 32bit float currently */
692 assert(src_type
.floating
&& src_type
.width
== 32);
694 for(i
= 0; i
< num_tmps
; ++i
)
695 dst
[i
] = lp_build_float_to_half(gallivm
, tmp
[i
]);
700 /* Pre convert half-floats to floats
702 else if (src_type
.floating
&& src_type
.width
== 16)
704 for(i
= 0; i
< num_tmps
; ++i
)
705 tmp
[i
] = lp_build_half_to_float(gallivm
, tmp
[i
]);
714 if(memcmp(&src_type
, &dst_type
, sizeof src_type
) != 0) {
715 struct lp_build_context bld
;
716 double src_min
= lp_const_min(src_type
);
717 double dst_min
= lp_const_min(dst_type
);
718 double src_max
= lp_const_max(src_type
);
719 double dst_max
= lp_const_max(dst_type
);
722 lp_build_context_init(&bld
, gallivm
, tmp_type
);
724 if(src_min
< dst_min
) {
728 thres
= lp_build_const_vec(gallivm
, src_type
, dst_min
);
729 for(i
= 0; i
< num_tmps
; ++i
)
730 tmp
[i
] = lp_build_max(&bld
, tmp
[i
], thres
);
733 if(src_max
> dst_max
) {
737 thres
= lp_build_const_vec(gallivm
, src_type
, dst_max
);
738 for(i
= 0; i
< num_tmps
; ++i
)
739 tmp
[i
] = lp_build_min(&bld
, tmp
[i
], thres
);
744 * Scale to the narrowest range
747 if(dst_type
.floating
) {
750 else if(tmp_type
.floating
) {
751 if(!dst_type
.fixed
&& !dst_type
.sign
&& dst_type
.norm
) {
752 for(i
= 0; i
< num_tmps
; ++i
) {
753 tmp
[i
] = lp_build_clamped_float_to_unsigned_norm(gallivm
,
758 tmp_type
.floating
= FALSE
;
761 double dst_scale
= lp_const_scale(dst_type
);
763 if (dst_scale
!= 1.0) {
764 LLVMValueRef scale
= lp_build_const_vec(gallivm
, tmp_type
, dst_scale
);
765 for(i
= 0; i
< num_tmps
; ++i
)
766 tmp
[i
] = LLVMBuildFMul(builder
, tmp
[i
], scale
, "");
770 * these functions will use fptosi in some form which won't work
771 * with 32bit uint dst. Causes lp_test_conv failures though.
774 assert(dst_type
.sign
|| dst_type
.width
< 32);
776 if (dst_type
.sign
&& dst_type
.norm
&& !dst_type
.fixed
) {
777 struct lp_build_context bld
;
779 lp_build_context_init(&bld
, gallivm
, tmp_type
);
780 for(i
= 0; i
< num_tmps
; ++i
) {
781 tmp
[i
] = lp_build_iround(&bld
, tmp
[i
]);
783 tmp_type
.floating
= FALSE
;
786 LLVMTypeRef tmp_vec_type
;
788 tmp_type
.floating
= FALSE
;
789 tmp_vec_type
= lp_build_vec_type(gallivm
, tmp_type
);
790 for(i
= 0; i
< num_tmps
; ++i
) {
793 tmp
[i
] = LLVMBuildFPToSI(builder
, tmp
[i
], tmp_vec_type
, "");
795 tmp
[i
] = LLVMBuildFPToUI(builder
, tmp
[i
], tmp_vec_type
, "");
797 /* FIXME: there is no SSE counterpart for LLVMBuildFPToUI */
798 tmp
[i
] = LLVMBuildFPToSI(builder
, tmp
[i
], tmp_vec_type
, "");
805 unsigned src_shift
= lp_const_shift(src_type
);
806 unsigned dst_shift
= lp_const_shift(dst_type
);
807 unsigned src_offset
= lp_const_offset(src_type
);
808 unsigned dst_offset
= lp_const_offset(dst_type
);
809 struct lp_build_context bld
;
810 lp_build_context_init(&bld
, gallivm
, tmp_type
);
812 /* Compensate for different offsets */
813 /* sscaled -> unorm and similar would cause negative shift count, skip */
814 if (dst_offset
> src_offset
&& src_type
.width
> dst_type
.width
&& src_shift
> 0) {
815 for (i
= 0; i
< num_tmps
; ++i
) {
816 LLVMValueRef shifted
;
818 shifted
= lp_build_shr_imm(&bld
, tmp
[i
], src_shift
- 1);
819 tmp
[i
] = LLVMBuildSub(builder
, tmp
[i
], shifted
, "");
823 if(src_shift
> dst_shift
) {
824 for(i
= 0; i
< num_tmps
; ++i
)
825 tmp
[i
] = lp_build_shr_imm(&bld
, tmp
[i
], src_shift
- dst_shift
);
830 * Truncate or expand bit width
832 * No data conversion should happen here, although the sign bits are
833 * crucial to avoid bad clamping.
837 struct lp_type new_type
;
840 new_type
.sign
= dst_type
.sign
;
841 new_type
.width
= dst_type
.width
;
842 new_type
.length
= dst_type
.length
;
844 lp_build_resize(gallivm
, tmp_type
, new_type
, tmp
, num_srcs
, tmp
, num_dsts
);
851 * Scale to the widest range
854 if(src_type
.floating
) {
857 else if(!src_type
.floating
&& dst_type
.floating
) {
858 if(!src_type
.fixed
&& !src_type
.sign
&& src_type
.norm
) {
859 for(i
= 0; i
< num_tmps
; ++i
) {
860 tmp
[i
] = lp_build_unsigned_norm_to_float(gallivm
,
865 tmp_type
.floating
= TRUE
;
868 double src_scale
= lp_const_scale(src_type
);
869 LLVMTypeRef tmp_vec_type
;
871 /* Use an equally sized integer for intermediate computations */
872 tmp_type
.floating
= TRUE
;
873 tmp_type
.sign
= TRUE
;
874 tmp_vec_type
= lp_build_vec_type(gallivm
, tmp_type
);
875 for(i
= 0; i
< num_tmps
; ++i
) {
878 tmp
[i
] = LLVMBuildSIToFP(builder
, tmp
[i
], tmp_vec_type
, "");
880 tmp
[i
] = LLVMBuildUIToFP(builder
, tmp
[i
], tmp_vec_type
, "");
882 /* FIXME: there is no SSE counterpart for LLVMBuildUIToFP */
883 tmp
[i
] = LLVMBuildSIToFP(builder
, tmp
[i
], tmp_vec_type
, "");
887 if (src_scale
!= 1.0) {
888 LLVMValueRef scale
= lp_build_const_vec(gallivm
, tmp_type
, 1.0/src_scale
);
889 for(i
= 0; i
< num_tmps
; ++i
)
890 tmp
[i
] = LLVMBuildFMul(builder
, tmp
[i
], scale
, "");
893 /* the formula above will produce value below -1.0 for most negative
894 * value but everything seems happy with that hence disable for now */
895 if (0 && !src_type
.fixed
&& src_type
.norm
&& src_type
.sign
) {
896 struct lp_build_context bld
;
898 lp_build_context_init(&bld
, gallivm
, dst_type
);
899 for(i
= 0; i
< num_tmps
; ++i
) {
900 tmp
[i
] = lp_build_max(&bld
, tmp
[i
],
901 lp_build_const_vec(gallivm
, dst_type
, -1.0f
));
907 unsigned src_shift
= lp_const_shift(src_type
);
908 unsigned dst_shift
= lp_const_shift(dst_type
);
909 unsigned src_offset
= lp_const_offset(src_type
);
910 unsigned dst_offset
= lp_const_offset(dst_type
);
911 struct lp_build_context bld
;
912 lp_build_context_init(&bld
, gallivm
, tmp_type
);
914 if (src_shift
< dst_shift
) {
915 LLVMValueRef pre_shift
[LP_MAX_VECTOR_LENGTH
];
917 if (dst_shift
- src_shift
< dst_type
.width
) {
918 for (i
= 0; i
< num_tmps
; ++i
) {
919 pre_shift
[i
] = tmp
[i
];
920 tmp
[i
] = lp_build_shl_imm(&bld
, tmp
[i
], dst_shift
- src_shift
);
925 * This happens for things like sscaled -> unorm conversions. Shift
926 * counts equal to bit width cause undefined results, so hack around it.
928 for (i
= 0; i
< num_tmps
; ++i
) {
929 pre_shift
[i
] = tmp
[i
];
930 tmp
[i
] = lp_build_zero(gallivm
, dst_type
);
934 /* Compensate for different offsets */
935 if (dst_offset
> src_offset
) {
936 for (i
= 0; i
< num_tmps
; ++i
) {
937 tmp
[i
] = LLVMBuildSub(builder
, tmp
[i
], pre_shift
[i
], "");
943 for(i
= 0; i
< num_dsts
; ++i
) {
945 assert(lp_check_value(dst_type
, dst
[i
]));
951 * Bit mask conversion.
953 * This will convert the integer masks that match the given types.
955 * The mask values should 0 or -1, i.e., all bits either set to zero or one.
956 * Any other value will likely cause unpredictable results.
958 * This is basically a very trimmed down version of lp_build_conv.
961 lp_build_conv_mask(struct gallivm_state
*gallivm
,
962 struct lp_type src_type
,
963 struct lp_type dst_type
,
964 const LLVMValueRef
*src
, unsigned num_srcs
,
965 LLVMValueRef
*dst
, unsigned num_dsts
)
968 /* We must not loose or gain channels. Only precision */
969 assert(src_type
.length
* num_srcs
== dst_type
.length
* num_dsts
);
974 * We assume all values are 0 or -1
977 src_type
.floating
= FALSE
;
978 src_type
.fixed
= FALSE
;
979 src_type
.sign
= TRUE
;
980 src_type
.norm
= FALSE
;
982 dst_type
.floating
= FALSE
;
983 dst_type
.fixed
= FALSE
;
984 dst_type
.sign
= TRUE
;
985 dst_type
.norm
= FALSE
;
988 * Truncate or expand bit width
991 lp_build_resize(gallivm
, src_type
, dst_type
, src
, num_srcs
, dst
, num_dsts
);