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gallivm: only use lp_build_conv 4x4f -> 1x16 ub fastpath with sse2 

This is relying on lp_build_pack2 using the sse2 pack intrinsics which
handle clamping.
(Alternatively could have make it use lp_build_packs2 but it might
not even produce more efficient code than not using the fastpath
in the first place.)
This commit is contained in:
Roland Scheidegger 2010-10-13 15:26:37 +02:00
parent ff4b397517
commit d838e4f66d
1 changed files with 5 additions and 19 deletions
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24
src/gallium/auxiliary/gallivm/lp_bld_conv.c
View File

@ -267,7 +267,9 @@ lp_build_conv(LLVMBuilderRef builder,
dst_type.sign == 0 &&
dst_type.norm == 1 &&
dst_type.width == 8 &&
dst_type.length == 16)
dst_type.length == 16 &&
util_cpu_caps.has_sse2)
{
int i;
@ -306,23 +308,7 @@ lp_build_conv(LLVMBuilderRef builder,
c = LLVMBuildFMul(builder, src[2], const_255f, "");
d = LLVMBuildFMul(builder, src[3], const_255f, "");
/* lp_build_round generates excessively general code without
* sse2, so do rounding manually.
*/
if (!util_cpu_caps.has_sse2) {
LLVMValueRef const_half = lp_build_const_vec(src_type, 0.5f);
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;
bld.builder = builder;
@ -339,7 +325,7 @@ lp_build_conv(LLVMBuilderRef builder,
src_int2 = lp_build_iround(&bld, c);
src_int3 = lp_build_iround(&bld, d);
}
/* relying on clamping behavior of sse2 intrinsics here */
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);
dst[i] = lp_build_pack2(builder, int16_type, dst_type, lo, hi);