#!/usr/bin/env bash
# build_tex.sh KERNEL SRC OUT_DIR: one texture kernel. NVIDIA's PTX for KERNEL, edited by make_ptx.py so
# part of it calls functions from SRC.hip, is compiled by ZLUDA with SRC's bitcode linked in
# (D4R_ZLUDA_EXTRA_BC) and the resulting code object is saved as OUT_DIR/KERNEL.hsaco.
# Called by kernels/build.sh, which sets D4R_ROCM_DIR, D4R_GPU_ARCH, D4R_DLSS_PTX_DIR, D4R_PTXLOAD and
# needs D4R_ZLUDA_BUILD.
set -euo pipefail
K=$1 SRC=$2 OUT=$3
D="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
R="${D4R_ROCM_DIR:-/opt/rocm}"
ARCH="${D4R_GPU_ARCH:-gfx1101}"
LLVM="$R/lib/llvm/bin"
B="$(mktemp -d)"
trap 'rm -rf "$B"' EXIT
# SRC.hip -> bitcode without target attributes, so ZLUDA's own target settings apply after linking
"$LLVM/clang++" -x hip -std=c++20 -nogpuinc -nogpulib -O3 -mno-wavefrontsize64 --offload-device-only \
    --offload-arch="$ARCH" -fgpu-rdc -emit-llvm -c -Xclang -fdenormal-fp-math=dynamic -o "$B/raw.bc" "$D/$SRC.hip"
"$LLVM/llvm-dis" "$B/raw.bc" -o "$B/raw.ll"
sed -E -e '/@llvm.used/d' -e '/wchar_size/d' -e '/llvm.module.flags/d' -e '/__hip_cuid/d' -e 's/optnone//g' \
    -e "s/\"target-cpu\"=\"$ARCH\"//g" -e 's/"target-features"="[^"]+"//g' "$B/raw.ll" | "$LLVM/llvm-as" -o "$B/extra.bc" -
python3 "$D/make_ptx.py" "$K" "$B/$K.ptx" >/dev/null
env LD_LIBRARY_PATH="$D4R_ZLUDA_BUILD:$R/lib" XDG_CACHE_HOME="$B/jit" D4R_ZLUDA_DUMP_DIR="$B/dump" \
    D4R_ZLUDA_EXTRA_BC="$B/extra.bc" D4R_ZLUDA_WMMA=1 D4R_ZLUDA_WMMA_FP8=1 D4R_ZLUDA_IGNORE_DENORMAL=1 \
    D4R_ZLUDA_IMPLICIT_MAX_BLOCK=256 "$D4R_PTXLOAD" "$B/$K.ptx" >/dev/null
cp "$B/dump/module.hsaco" "$OUT/$K.hsaco"
printf '%-52s %s\n' "$K" "$(grep -E '^\s+\.(vgpr_count|private_segment_fixed_size):' "$B/dump/asm.s" | tr -s ' ' | paste -sd' ')"