+/// Translate a (dfmt, nfmt) pair into a chip-appropriate combined format
+/// value for LLVM8+ tbuffer intrinsics.
+static unsigned
+ac_get_tbuffer_format(struct ac_llvm_context *ctx,
+ unsigned dfmt, unsigned nfmt)
+{
+ if (ctx->chip_class >= GFX10) {
+ unsigned format;
+ switch (dfmt) {
+ default: unreachable("bad dfmt");
+ case V_008F0C_BUF_DATA_FORMAT_8: format = V_008F0C_IMG_FORMAT_8_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_8_8: format = V_008F0C_IMG_FORMAT_8_8_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_8_8_8_8: format = V_008F0C_IMG_FORMAT_8_8_8_8_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_16: format = V_008F0C_IMG_FORMAT_16_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_16_16: format = V_008F0C_IMG_FORMAT_16_16_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_16_16_16_16: format = V_008F0C_IMG_FORMAT_16_16_16_16_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_32: format = V_008F0C_IMG_FORMAT_32_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_32_32: format = V_008F0C_IMG_FORMAT_32_32_UINT; break;
+ case V_008F0C_BUF_DATA_FORMAT_32_32_32_32: format = V_008F0C_IMG_FORMAT_32_32_32_32_UINT; break;
+ }
+
+ // Use the regularity properties of the combined format enum.
+ //
+ // Note: float is incompatible with 8-bit data formats,
+ // [us]{norm,scaled} are incomparible with 32-bit data formats.
+ // [us]scaled are not writable.
+ switch (nfmt) {
+ case V_008F0C_BUF_NUM_FORMAT_UNORM: format -= 4; break;
+ case V_008F0C_BUF_NUM_FORMAT_SNORM: format -= 3; break;
+ case V_008F0C_BUF_NUM_FORMAT_USCALED: format -= 2; break;
+ case V_008F0C_BUF_NUM_FORMAT_SSCALED: format -= 1; break;
+ default: unreachable("bad nfmt");
+ case V_008F0C_BUF_NUM_FORMAT_UINT: break;
+ case V_008F0C_BUF_NUM_FORMAT_SINT: format += 1; break;
+ case V_008F0C_BUF_NUM_FORMAT_FLOAT: format += 2; break;
+ }
+
+ return format;
+ } else {
+ return dfmt | (nfmt << 4);
+ }
+}
+