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gallivm: simplify shuffling in emit_store_reg() 

The writemask can be implemented with just one llvm vector shuffle.

Signed-off-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17561>
This commit is contained in:
Brian Paul 2022-07-05 16:34:39 -06:00 committed by Marge Bot
parent ef7da4b292
commit 9984ec67f2
1 changed files with 10 additions and 12 deletions
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22
src/gallium/auxiliary/gallivm/lp_bld_nir_aos.c
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@ -197,20 +197,18 @@ emit_store_reg(struct lp_build_nir_context *bld_base,
LLVMValueRef cur = LLVMBuildLoad(gallivm->builder, reg_storage, "");
LLVMTypeRef i32t = LLVMInt32TypeInContext(gallivm->context);
for (unsigned i = 0; i < 4; i++) {
if (writemask & (1 << i)) {
LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH] = { 0 };
for (unsigned j = 0; j < 16; j++){
if (j % 4 == i)
shuffles[j] = LLVMConstInt(i32t, 16 + j, 0);
else
shuffles[j] = LLVMConstInt(i32t, j, 0);
}
cur = LLVMBuildShuffleVector(gallivm->builder, cur, dst[0],
LLVMConstVector(shuffles, 16), "");
LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH];
for (unsigned j = 0; j < 16; j++) {
unsigned comp = j % 4;
if (writemask & (1 << comp)) {
shuffles[j] = LLVMConstInt(i32t, 16 + j, 0); // new val
} else {
shuffles[j] = LLVMConstInt(i32t, j, 0); // cur val
}
}
cur = LLVMBuildShuffleVector(gallivm->builder, cur, dst[0],
LLVMConstVector(shuffles, 16), "");
LLVMBuildStore(gallivm->builder, cur, reg_storage);
}