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ac: Introduce ac_build_expand()

Browse source 
And implement ac_bulid_expand_to_vec4() on top of it.

Fixes: 7e7ee82698 ("ac: add support for 16bit buffer loads")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Connor Abbott 2018-10-18 15:30:11 +02:00
parent fdd926d5b2
commit 59535b05cf
2 changed files with 41 additions and 26 deletions
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64
src/amd/common/ac_llvm_build.c
View file

@ -523,6 +523,43 @@ ac_build_gather_values(struct ac_llvm_context *ctx,
return ac_build_gather_values_extended(ctx, values, value_count, 1, false, false);
}
/* Expand a scalar or vector to <dst_channels x type> by filling the remaining
* channels with undef. Extract at most src_channels components from the input.
*/
LLVMValueRef ac_build_expand(struct ac_llvm_context *ctx,
LLVMValueRef value,
unsigned src_channels,
unsigned dst_channels)
{
LLVMTypeRef elemtype;
LLVMValueRef chan[dst_channels];
if (LLVMGetTypeKind(LLVMTypeOf(value)) == LLVMVectorTypeKind) {
unsigned vec_size = LLVMGetVectorSize(LLVMTypeOf(value));
if (src_channels == dst_channels && vec_size == dst_channels)
return value;
src_channels = MIN2(src_channels, vec_size);
for (unsigned i = 0; i < src_channels; i++)
chan[i] = ac_llvm_extract_elem(ctx, value, i);
elemtype = LLVMGetElementType(LLVMTypeOf(value));
} else {
if (src_channels) {
assert(src_channels == 1);
chan[0] = value;
}
elemtype = LLVMTypeOf(value);
}
for (unsigned i = src_channels; i < dst_channels; i++)
chan[i] = LLVMGetUndef(elemtype);
return ac_build_gather_values(ctx, chan, dst_channels);
}
/* Expand a scalar or vector to <4 x type> by filling the remaining channels
* with undef. Extract at most num_channels components from the input.
*/
@ -530,32 +567,7 @@ LLVMValueRef ac_build_expand_to_vec4(struct ac_llvm_context *ctx,
LLVMValueRef value,
unsigned num_channels)
{
LLVMTypeRef elemtype;
LLVMValueRef chan[4];
if (LLVMGetTypeKind(LLVMTypeOf(value)) == LLVMVectorTypeKind) {
unsigned vec_size = LLVMGetVectorSize(LLVMTypeOf(value));
num_channels = MIN2(num_channels, vec_size);
if (num_channels >= 4)
return value;
for (unsigned i = 0; i < num_channels; i++)
chan[i] = ac_llvm_extract_elem(ctx, value, i);
elemtype = LLVMGetElementType(LLVMTypeOf(value));
} else {
if (num_channels) {
assert(num_channels == 1);
chan[0] = value;
}
elemtype = LLVMTypeOf(value);
}
while (num_channels < 4)
chan[num_channels++] = LLVMGetUndef(elemtype);
return ac_build_gather_values(ctx, chan, 4);
return ac_build_expand(ctx, value, num_channels, 4);
}
LLVMValueRef ac_build_round(struct ac_llvm_context *ctx, LLVMValueRef value)

3
src/amd/common/ac_llvm_build.h
View file

@ -172,6 +172,9 @@ LLVMValueRef
ac_build_gather_values(struct ac_llvm_context *ctx,
LLVMValueRef *values,
unsigned value_count);
LLVMValueRef ac_build_expand(struct ac_llvm_context *ctx,
LLVMValueRef value,
unsigned src_channels, unsigned dst_channels);
LLVMValueRef ac_build_expand_to_vec4(struct ac_llvm_context *ctx,
LLVMValueRef value,
unsigned num_channels);