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gallivm: special case conversion 4x4f to 1x16ub

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Nice reduction in the number of operations required for final color
output in many shaders.
This commit is contained in:
Keith Whitwell 2010-10-04 15:00:34 +01:00
parent 29d6a1483d
commit 607e3c542c
1 changed files with 84 additions and 0 deletions
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84
src/gallium/auxiliary/gallivm/lp_bld_conv.c
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@ -69,6 +69,7 @@
#include "lp_bld_arit.h"
#include "lp_bld_pack.h"
#include "lp_bld_conv.h"
#include "lp_bld_intr.h"
/**
@ -241,6 +242,89 @@ lp_build_conv(LLVMBuilderRef builder,
}
num_tmps = num_srcs;
/* Special case 4x4f --> 1x16ub
*/
if (src_type.floating == 1 &&
src_type.fixed == 0 &&
src_type.sign == 1 &&
src_type.norm == 0 &&
src_type.width == 32 &&
src_type.length == 4 &&
dst_type.floating == 0 &&
dst_type.fixed == 0 &&
dst_type.sign == 0 &&
dst_type.norm == 1 &&
dst_type.width == 8 &&
dst_type.length == 16)
{
int i;
for (i = 0; i < num_dsts; i++, src += 4) {
struct lp_type int16_type = dst_type;
struct lp_type int32_type = dst_type;
LLVMValueRef lo, hi;
LLVMValueRef src_int0;
LLVMValueRef src_int1;
LLVMValueRef src_int2;
LLVMValueRef src_int3;
LLVMTypeRef int16_vec_type;
LLVMTypeRef int32_vec_type;
LLVMTypeRef src_vec_type;
LLVMTypeRef dst_vec_type;
LLVMValueRef const_255f;
int16_type.width *= 2;
int16_type.length /= 2;
int16_type.sign = 1;
int32_type.width *= 4;
int32_type.length /= 4;
int32_type.sign = 1;
src_vec_type = lp_build_vec_type(src_type);
dst_vec_type = lp_build_vec_type(dst_type);
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);
src_int0 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[0], const_255f, ""),
int32_vec_type, "");
src_int1 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[1], const_255f, ""),
int32_vec_type, "");
src_int2 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[2], const_255f, ""),
int32_vec_type, "");
src_int3 = LLVMBuildFPToSI(builder,
LLVMBuildFMul(builder, src[3], const_255f, ""),
int32_vec_type, "");
#if HAVE_LLVM >= 0x0207
lo = lp_build_intrinsic_binary(builder, "llvm.x86.sse2.packssdw.128",
int16_vec_type, src_int0, src_int1);
hi = lp_build_intrinsic_binary(builder, "llvm.x86.sse2.packssdw.128",
int16_vec_type, src_int2, src_int3);
dst[i] = lp_build_intrinsic_binary(builder, "llvm.x86.sse2.packuswb.128",
dst_vec_type, lo, hi);
#else
lo = lp_build_intrinsic_binary(builder, "llvm.x86.sse2.packssdw.128",
int32_vec_type, src_int0, src_int1);
hi = lp_build_intrinsic_binary(builder, "llvm.x86.sse2.packssdw.128",
int32_vec_type, src_int2, src_int3);
dst[i] = lp_build_intrinsic_binary(builder, "llvm.x86.sse2.packuswb.128",
int16_vec_type, lo, hi);
#endif
}
return;
}
/*
* Clamp if necessary
*/