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gallivm: round rather than truncate in new 4x4f->1x16ub conversion path

This commit is contained in:
Keith Whitwell 2010-10-06 11:48:10 +01:00
parent f91b4266c6
commit e191bf4a85
1 changed files with 38 additions and 13 deletions
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51
src/gallium/auxiliary/gallivm/lp_bld_conv.c
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@ -63,6 +63,7 @@
#include "util/u_debug.h"
#include "util/u_math.h"
#include "util/u_cpu_detect.h"
#include "lp_bld_type.h"
#include "lp_bld_const.h"
@ -274,6 +275,7 @@ lp_build_conv(LLVMBuilderRef builder,
LLVMTypeRef src_vec_type;
LLVMTypeRef dst_vec_type;
LLVMValueRef const_255f;
LLVMValueRef a, b, c, d;
int16_type.width *= 2;
int16_type.length /= 2;
@ -288,23 +290,46 @@ lp_build_conv(LLVMBuilderRef builder,
int16_vec_type = lp_build_vec_type(int16_type);
int32_vec_type = lp_build_vec_type(int32_type);
const_255f = lp_build_const_vec(src_type, 255.0);
const_255f = lp_build_const_vec(src_type, 255.0f);
src_int0 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[0], const_255f, ""),
int32_vec_type, "");
a = LLVMBuildFMul(builder, src[0], const_255f, "");
b = LLVMBuildFMul(builder, src[1], const_255f, "");
c = LLVMBuildFMul(builder, src[2], const_255f, "");
d = LLVMBuildFMul(builder, src[3], const_255f, "");
src_int1 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[1], const_255f, ""),
int32_vec_type, "");
/* lp_build_round generates excessively general code without
* sse4, so do rounding manually.
*/
if (!util_cpu_caps.has_sse4_1) {
LLVMValueRef const_half = lp_build_const_vec(src_type, 0.5f);
src_int2 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[2], const_255f, ""),
int32_vec_type, "");
a = LLVMBuildFAdd(builder, a, const_half, "");
b = LLVMBuildFAdd(builder, b, const_half, "");
c = LLVMBuildFAdd(builder, c, const_half, "");
d = LLVMBuildFAdd(builder, d, const_half, "");
src_int0 = LLVMBuildFPToSI(builder, a, int32_vec_type, "");
src_int1 = LLVMBuildFPToSI(builder, b, int32_vec_type, "");
src_int2 = LLVMBuildFPToSI(builder, c, int32_vec_type, "");
src_int3 = LLVMBuildFPToSI(builder, d, int32_vec_type, "");
}
else {
struct lp_build_context bld;
src_int3 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[3], const_255f, ""),
int32_vec_type, "");
bld.builder = builder;
bld.type = src_type;
bld.vec_type = src_vec_type;
bld.int_elem_type = lp_build_elem_type(int32_type);
bld.int_vec_type = int32_vec_type;
bld.undef = lp_build_undef(src_type);
bld.zero = lp_build_zero(src_type);
bld.one = lp_build_one(src_type);
src_int0 = lp_build_iround(&bld, a);
src_int1 = lp_build_iround(&bld, b);
src_int2 = lp_build_iround(&bld, c);
src_int3 = lp_build_iround(&bld, d);
}
lo = lp_build_pack2(builder, int32_type, int16_type, src_int0, src_int1);
hi = lp_build_pack2(builder, int32_type, int16_type, src_int2, src_int3);