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-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_conv.c329
1 files changed, 0 insertions, 329 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_conv.c b/src/gallium/auxiliary/gallivm/lp_bld_conv.c
index 2f39abc63d8..dc3649db363 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_conv.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_conv.c
@@ -155,335 +155,6 @@ lp_build_bswap_vec(struct gallivm_state *gallivm,
/**
- * Convert float32 to a float-like value with less exponent and mantissa
- * bits. The mantissa is still biased, and the mantissa still has an implied 1,
- * but there's no sign bit.
- *
- * @param src (vector) float value to convert
- * @param mantissa_bits the number of mantissa bits
- * @param exponent_bits the number of exponent bits
- *
- * Unlike float_to_half using accurate method here.
- * This implements round-towards-zero (trunc) hence too large numbers get
- * converted to largest representable number, not infinity.
- * Small numbers may get converted to denorms, depending on normal
- * float denorm handling of the cpu.
- * Note that compared to the references, below, we skip any rounding bias
- * since we do rounding towards zero - OpenGL allows rounding towards zero
- * (though not preferred) and DX10 even seems to require it.
- * Note that this will not do any packing - the value will
- * look like a "rescaled float" (except for Inf/NaN) but be returned
- * as int32.
- *
- * ref http://fgiesen.wordpress.com/2012/03/28/half-to-float-done-quic/
- * ref https://gist.github.com/rygorous/2156668
- */
-static LLVMValueRef
-lp_build_float_to_smallfloat_nosign(struct gallivm_state *gallivm,
- struct lp_type i32_type,
- LLVMValueRef src,
- unsigned mantissa_bits,
- unsigned exponent_bits)
-{
- LLVMBuilderRef builder = gallivm->builder;
- LLVMValueRef i32_floatexpmask, i32_smallexpmask, magic, normal;
- LLVMValueRef clamped, tmp, i32_roundmask, small_max, src_abs;
- LLVMValueRef is_nan, is_posinf, is_nan_or_posinf, i32_qnanbit, nan_or_posinf;
- struct lp_type f32_type = lp_type_float_vec(32, 32 * i32_type.length);
- struct lp_build_context f32_bld, i32_bld;
- LLVMValueRef zero = lp_build_const_vec(gallivm, f32_type, 0.0f);
-
- lp_build_context_init(&f32_bld, gallivm, f32_type);
- lp_build_context_init(&i32_bld, gallivm, i32_type);
-
- i32_smallexpmask = lp_build_const_int_vec(gallivm, i32_type,
- ((1 << exponent_bits) - 1) << 23);
- i32_floatexpmask = lp_build_const_int_vec(gallivm, i32_type, 0xff << 23);
-
- /* "ordinary" number */
- /* clamp to pos range (can still have sign bit if NaN or negative zero) */
- clamped = lp_build_max(&f32_bld, src, zero);
- clamped = LLVMBuildBitCast(builder, clamped, i32_bld.vec_type, "");
- /* get rid of excess mantissa bits, and while here also potential sign bit */
- i32_roundmask = lp_build_const_int_vec(gallivm, i32_type,
- ~((1 << (23 - mantissa_bits)) - 1) |
- 0x7fffffff);
-
- tmp = lp_build_and(&i32_bld, clamped, i32_roundmask);
- tmp = LLVMBuildBitCast(builder, tmp, f32_bld.vec_type, "");
- /* bias exponent (and denormalize if necessary) */
- magic = lp_build_const_int_vec(gallivm, i32_type,
- ((1 << (exponent_bits - 1)) - 1) << 23);
- magic = LLVMBuildBitCast(builder, magic, f32_bld.vec_type, "");
- normal = lp_build_mul(&f32_bld, tmp, magic);
-
- /* clamp to max value */
- small_max = lp_build_const_int_vec(gallivm, i32_type,
- (((1 << exponent_bits) - 2) << 23) |
- (((1 << mantissa_bits) - 1) << (23 - mantissa_bits)));
- small_max = LLVMBuildBitCast(builder, small_max, f32_bld.vec_type, "");
- normal = lp_build_min(&f32_bld, normal, small_max);
- normal = LLVMBuildBitCast(builder, normal, i32_bld.vec_type, "");
-
- /*
- * handle nan/inf cases
- * a little bit tricky since -Inf -> 0, +Inf -> +Inf, +-Nan -> +Nan
- * Note that on a lucky day, we could simplify this a bit,
- * by just using the max(src, zero) result - this will have -Inf
- * clamped to 0, and MIGHT preserve the NaNs.
- */
- src_abs = lp_build_abs(&f32_bld, src);
- src_abs = LLVMBuildBitCast(builder, src_abs, i32_bld.vec_type, "");
- src = LLVMBuildBitCast(builder, src, i32_bld.vec_type, "");
- is_nan = lp_build_compare(gallivm, i32_type, PIPE_FUNC_GREATER,
- src_abs, i32_floatexpmask);
- is_posinf = lp_build_compare(gallivm, i32_type, PIPE_FUNC_EQUAL,
- src, i32_floatexpmask);
- is_nan_or_posinf = lp_build_and(&i32_bld, is_nan, is_posinf);
- /* could also set more mantissa bits but need at least the highest mantissa bit */
- i32_qnanbit = lp_build_const_vec(gallivm, i32_type, 1 << 22);
- /* combine maxexp with qnanbit */
- nan_or_posinf = lp_build_or(&i32_bld, i32_smallexpmask,
- lp_build_and(&i32_bld, is_nan, i32_qnanbit));
-
- return lp_build_select(&i32_bld, is_nan_or_posinf, nan_or_posinf, normal);
-}
-
-
-/**
- * Convert rgba float SoA values to packed r11g11b10 values.
- *
- * @param src SoA float (vector) values to convert.
- */
-LLVMValueRef
-lp_build_float_to_r11g11b10(struct gallivm_state *gallivm,
- LLVMValueRef *src)
-{
- LLVMValueRef dst, rcomp, bcomp, gcomp, shift, mask;
- struct lp_build_context i32_bld;
- LLVMTypeRef src_type = LLVMTypeOf(*src);
- unsigned src_length = LLVMGetTypeKind(src_type) == LLVMVectorTypeKind ?
- LLVMGetVectorSize(src_type) : 1;
- struct lp_type i32_type = lp_type_int_vec(32, 32 * src_length);
-
- lp_build_context_init(&i32_bld, gallivm, i32_type);
-
- /* "rescale" - this does the actual conversion except the packing */
- rcomp = lp_build_float_to_smallfloat_nosign(gallivm, i32_type, src[0], 6, 5);
- gcomp = lp_build_float_to_smallfloat_nosign(gallivm, i32_type, src[1], 6, 5);
- bcomp = lp_build_float_to_smallfloat_nosign(gallivm, i32_type, src[2], 5, 5);
-
- /* pack rescaled SoA floats to r11g11b10 AoS values */
- shift = lp_build_const_int_vec(gallivm, i32_type, 23 - 6);
- rcomp = lp_build_shr(&i32_bld, rcomp, shift);
-
- shift = lp_build_const_int_vec(gallivm, i32_type, 23 - 17);
- mask = lp_build_const_int_vec(gallivm, i32_type, 0x7ff << 11);
- gcomp = lp_build_shr(&i32_bld, gcomp, shift);
- gcomp = lp_build_and(&i32_bld, gcomp, mask);
-
- shift = lp_build_const_int_vec(gallivm, i32_type, 27 - 23);
- mask = lp_build_const_int_vec(gallivm, i32_type, 0x3ff << 22);
- bcomp = lp_build_shl(&i32_bld, bcomp, shift);
- bcomp = lp_build_and(&i32_bld, bcomp, mask);
-
- dst = lp_build_or(&i32_bld, rcomp, gcomp);
- return lp_build_or(&i32_bld, dst, bcomp);
-}
-
-
-/**
- * Convert a float-like value with less exponent and mantissa
- * bits than a normal float32 to a float32. The mantissa of
- * the source value is assumed to have an implied 1, and the exponent
- * is biased. There are no negative values.
- * The source value to extract must be in a 32bit int.
- * While this helper is generic, it is only ever going to be useful for
- * r11g11b10 (no other common format exists with the same properties).
- *
- * @param src (vector) value to convert
- * @param mantissa_bits the number of mantissa bits
- * @param exponent_bits the number of exponent bits
- * @param mantissa_start the bit start position of the packed component
- *
- * ref http://fgiesen.wordpress.com/2012/03/28/half-to-float-done-quic/
- * ref https://gist.github.com/rygorous/2156668
- */
-static LLVMValueRef
-lp_build_smallfloat_nosign_to_float(struct gallivm_state *gallivm,
- struct lp_type f32_type,
- LLVMValueRef src,
- unsigned mantissa_bits,
- unsigned exponent_bits,
- unsigned mantissa_start)
-{
- LLVMBuilderRef builder = gallivm->builder;
- LLVMValueRef smallexpmask, i32_floatexpmask, magic;
- LLVMValueRef wasinfnan, tmp, res, shift, mask;
- unsigned exponent_start = mantissa_start + mantissa_bits;
- struct lp_type i32_type = lp_type_int_vec(32, 32 * f32_type.length);
- struct lp_build_context f32_bld, i32_bld;
-
- lp_build_context_init(&f32_bld, gallivm, f32_type);
- lp_build_context_init(&i32_bld, gallivm, i32_type);
-
- /* extract the component to "float position" */
- if (exponent_start < 23) {
- shift = lp_build_const_int_vec(gallivm, i32_type, 23 - exponent_start);
- src = lp_build_shl(&i32_bld, src, shift);
- }
- else {
- shift = lp_build_const_int_vec(gallivm, i32_type, exponent_start - 23);
- src = lp_build_shr(&i32_bld, src, shift);
- }
- mask = lp_build_const_int_vec(gallivm, i32_type,
- ((1 << (mantissa_bits + exponent_bits)) - 1) <<
- (23 - mantissa_bits));
- src = lp_build_and(&i32_bld, src, mask);
- src = LLVMBuildBitCast(builder, src, f32_bld.vec_type, "");
-
- /* now do the actual scaling */
- smallexpmask = lp_build_const_int_vec(gallivm, i32_type,
- ((1 << exponent_bits) - 1) << 23);
- i32_floatexpmask = lp_build_const_int_vec(gallivm, i32_type, 0xff << 23);
- /*
- * magic number has exponent new exp bias + (new exp bias - old exp bias),
- * mantissa is 0.
- */
- magic = lp_build_const_int_vec(gallivm, i32_type,
- (255 - (1 << (exponent_bits - 1))) << 23);
- magic = LLVMBuildBitCast(builder, magic, f32_bld.vec_type, "");
-
- /* adjust exponent and fix denorms */
- res = lp_build_mul(&f32_bld, src, magic);
-
- /*
- * if exp was max (== NaN or Inf) set new exp to max (keep mantissa),
- * so a simple "or" will do (because exp adjust will leave mantissa intact)
- */
- /* use float compare (better for AVX 8-wide / no AVX2 though otherwise should use int) */
- smallexpmask = LLVMBuildBitCast(builder, magic, f32_bld.vec_type, "");
- wasinfnan = lp_build_compare(gallivm, f32_type, PIPE_FUNC_GEQUAL, src, smallexpmask);
- res = LLVMBuildBitCast(builder, res, i32_bld.vec_type, "");
- tmp = lp_build_and(&i32_bld, i32_floatexpmask, wasinfnan);
- res = lp_build_or(&i32_bld, tmp, res);
-
- return LLVMBuildBitCast(builder, res, f32_bld.vec_type, "");
-}
-
-
-/**
- * Convert packed float format (r11g11b10) value(s) to rgba float SoA values.
- *
- * @param src packed AoS r11g11b10 values (as (vector) int32)
- * @param dst pointer to the SoA result values
- */
-void
-lp_build_r11g11b10_to_float(struct gallivm_state *gallivm,
- LLVMValueRef src,
- LLVMValueRef *dst)
-{
- LLVMTypeRef src_type = LLVMTypeOf(src);
- unsigned src_length = LLVMGetTypeKind(src_type) == LLVMVectorTypeKind ?
- LLVMGetVectorSize(src_type) : 1;
- struct lp_type f32_type = lp_type_float_vec(32, 32 * src_length);
-
- dst[0] = lp_build_smallfloat_nosign_to_float(gallivm, f32_type, src, 6, 5, 0);
- dst[1] = lp_build_smallfloat_nosign_to_float(gallivm, f32_type, src, 6, 5, 11);
- dst[2] = lp_build_smallfloat_nosign_to_float(gallivm, f32_type, src, 5, 5, 22);
-
- /* Just set alpha to one */
- dst[3] = lp_build_one(gallivm, f32_type);
-}
-
-
-static LLVMValueRef
-lp_build_rgb9_to_float_helper(struct gallivm_state *gallivm,
- struct lp_type f32_type,
- LLVMValueRef src,
- LLVMValueRef scale,
- unsigned mantissa_start)
-{
- LLVMValueRef shift, mask;
-
- struct lp_type i32_type = lp_type_int_vec(32, 32 * f32_type.length);
- struct lp_build_context i32_bld, f32_bld;
-
- lp_build_context_init(&i32_bld, gallivm, i32_type);
- lp_build_context_init(&f32_bld, gallivm, f32_type);
-
- /*
- * This is much easier as other weirdo float formats, since
- * there's no sign, no Inf/NaN, and there's nothing special
- * required for normals/denormals neither (as without the implied one
- * for the mantissa for other formats, everything looks like a denormal).
- * So just do (float)comp_bits * scale
- */
- shift = lp_build_const_int_vec(gallivm, i32_type, mantissa_start);
- mask = lp_build_const_int_vec(gallivm, i32_type, 0x1ff);
- src = lp_build_shr(&i32_bld, src, shift);
- src = lp_build_and(&i32_bld, src, mask);
- src = lp_build_int_to_float(&f32_bld, src);
- return lp_build_mul(&f32_bld, src, scale);
-}
-
-
-/**
- * Convert shared exponent format (rgb9e5) value(s) to rgba float SoA values.
- *
- * @param src packed AoS rgb9e5 values (as (vector) int32)
- * @param dst pointer to the SoA result values
- */
-void
-lp_build_rgb9e5_to_float(struct gallivm_state *gallivm,
- LLVMValueRef src,
- LLVMValueRef *dst)
-{
- LLVMBuilderRef builder = gallivm->builder;
- LLVMTypeRef src_type = LLVMTypeOf(src);
- LLVMValueRef shift, scale, bias, exp;
- unsigned src_length = LLVMGetTypeKind(src_type) == LLVMVectorTypeKind ?
- LLVMGetVectorSize(src_type) : 1;
- struct lp_type i32_type = lp_type_int_vec(32, 32 * src_length);
- struct lp_type u32_type = lp_type_uint_vec(32, 32 * src_length);
- struct lp_type f32_type = lp_type_float_vec(32, 32 * src_length);
- struct lp_build_context i32_bld, u32_bld, f32_bld;
-
- lp_build_context_init(&i32_bld, gallivm, i32_type);
- lp_build_context_init(&u32_bld, gallivm, u32_type);
- lp_build_context_init(&f32_bld, gallivm, f32_type);
-
- /* extract exponent */
- shift = lp_build_const_int_vec(gallivm, i32_type, 27);
- /* this shift needs to be unsigned otherwise need mask */
- exp = lp_build_shr(&u32_bld, src, shift);
-
- /*
- * scale factor is 2 ^ (exp - bias)
- * (and additionally corrected here for the mantissa bits)
- * not using shift because
- * a) don't have vector shift in a lot of cases
- * b) shift direction changes hence need 2 shifts + conditional
- * (or rotate instruction which is even more rare (for instance XOP))
- * so use whacky float 2 ^ function instead manipulating exponent
- * (saves us the float conversion at the end too)
- */
- bias = lp_build_const_int_vec(gallivm, i32_type, 127 - (15 + 9));
- scale = lp_build_add(&i32_bld, exp, bias);
- shift = lp_build_const_int_vec(gallivm, i32_type, 23);
- scale = lp_build_shl(&i32_bld, scale, shift);
- scale = LLVMBuildBitCast(builder, scale, f32_bld.vec_type, "");
-
- dst[0] = lp_build_rgb9_to_float_helper(gallivm, f32_type, src, scale, 0);
- dst[1] = lp_build_rgb9_to_float_helper(gallivm, f32_type, src, scale, 9);
- dst[2] = lp_build_rgb9_to_float_helper(gallivm, f32_type, src, scale, 18);
-
- /* Just set alpha to one */
- dst[3] = f32_bld.one;
-}
-
-
-/**
* Converts int16 half-float to float32
* Note this can be performed in 1 instruction if vcvtph2ps exists (sse5 i think?)
* [llvm.x86.vcvtph2ps / _mm_cvtph_ps]
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 21:30:03 +0000