> On Jun 3, 2019, at 9:13 AM, Samuel Pitoiset <samuel.pitoi...@gmail.com> wrote:
>
> I thought LLVM was able to handle that itself but actually it
> does not. That means we shouldn't try to emit vec3 on SI because
> it's unsupported.
>
It should. Can you file a bug with an example that doesn’t work?
> Fixes: 6970a9a6ca9 ("ac,radv: remove the vec3 restriction with LLVM 9+")"
> Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
> ---
> src/amd/common/ac_llvm_build.c | 12 ++++++------
> src/amd/common/ac_llvm_util.h | 9 +++++++++
> src/amd/common/ac_nir_to_llvm.c | 3 ++-
> src/amd/vulkan/radv_nir_to_llvm.c | 2 +-
> 4 files changed, 18 insertions(+), 8 deletions(-)
>
> diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
> index 613c1eef942..7f5c8ef873c 100644
> --- a/src/amd/common/ac_llvm_build.c
> +++ b/src/amd/common/ac_llvm_build.c
> @@ -1167,7 +1167,7 @@ ac_build_llvm8_buffer_store_common(struct
> ac_llvm_context *ctx,
> args[idx++] = voffset ? voffset : ctx->i32_0;
> args[idx++] = soffset ? soffset : ctx->i32_0;
> args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
> - unsigned func = HAVE_LLVM < 0x900 && num_channels == 3 ? 4 :
> num_channels;
> + unsigned func = !ac_has_vec3_support(ctx->chip_class) && num_channels
> == 3 ? 4 : num_channels;
> const char *indexing_kind = structurized ? "struct" : "raw";
> char name[256], type_name[8];
>
> @@ -1227,7 +1227,7 @@ ac_build_buffer_store_dword(struct ac_llvm_context *ctx,
> {
> /* Split 3 channel stores, because only LLVM 9+ support 3-channel
> * intrinsics. */
> - if (num_channels == 3 && HAVE_LLVM < 0x900) {
> + if (num_channels == 3 && !ac_has_vec3_support(ctx->chip_class)) {
> LLVMValueRef v[3], v01;
>
> for (int i = 0; i < 3; i++) {
> @@ -1354,7 +1354,7 @@ ac_build_llvm8_buffer_load_common(struct
> ac_llvm_context *ctx,
> args[idx++] = voffset ? voffset : ctx->i32_0;
> args[idx++] = soffset ? soffset : ctx->i32_0;
> args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
> - unsigned func = HAVE_LLVM < 0x900 && num_channels == 3 ? 4 :
> num_channels;
> + unsigned func = !ac_has_vec3_support(ctx->chip_class) && num_channels
> == 3 ? 4 : num_channels;
> const char *indexing_kind = structurized ? "struct" : "raw";
> char name[256], type_name[8];
>
> @@ -1420,7 +1420,7 @@ ac_build_buffer_load(struct ac_llvm_context *ctx,
> if (num_channels == 1)
> return result[0];
>
> - if (num_channels == 3 && HAVE_LLVM < 0x900)
> + if (num_channels == 3 && !ac_has_vec3_support(ctx->chip_class))
> result[num_channels++] = LLVMGetUndef(ctx->f32);
> return ac_build_gather_values(ctx, result, num_channels);
> }
> @@ -1512,7 +1512,7 @@ ac_build_llvm8_tbuffer_load(struct ac_llvm_context *ctx,
> args[idx++] = soffset ? soffset : ctx->i32_0;
> args[idx++] = LLVMConstInt(ctx->i32, dfmt | (nfmt << 4), 0);
> args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
> - unsigned func = HAVE_LLVM < 0x900 && num_channels == 3 ? 4 :
> num_channels;
> + unsigned func = !ac_has_vec3_support(ctx->chip_class) && num_channels
> == 3 ? 4 : num_channels;
> const char *indexing_kind = structurized ? "struct" : "raw";
> char name[256], type_name[8];
>
> @@ -2011,7 +2011,7 @@ ac_build_llvm8_tbuffer_store(struct ac_llvm_context
> *ctx,
> args[idx++] = soffset ? soffset : ctx->i32_0;
> args[idx++] = LLVMConstInt(ctx->i32, dfmt | (nfmt << 4), 0);
> args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
> - unsigned func = HAVE_LLVM < 0x900 && num_channels == 3 ? 4 :
> num_channels;
> + unsigned func = !ac_has_vec3_support(ctx->chip_class) && num_channels
> == 3 ? 4 : num_channels;
> const char *indexing_kind = structurized ? "struct" : "raw";
> char name[256], type_name[8];
>
> diff --git a/src/amd/common/ac_llvm_util.h b/src/amd/common/ac_llvm_util.h
> index ca00540da80..a45647a3360 100644
> --- a/src/amd/common/ac_llvm_util.h
> +++ b/src/amd/common/ac_llvm_util.h
> @@ -146,6 +146,15 @@ bool ac_compile_module_to_binary(struct
> ac_compiler_passes *p, LLVMModuleRef mod
> void ac_llvm_add_barrier_noop_pass(LLVMPassManagerRef passmgr);
> void ac_enable_global_isel(LLVMTargetMachineRef tm);
>
> +static inline bool
> +ac_has_vec3_support(enum chip_class chip)
> +{
> + if (chip == GFX6)
> + return false;
> +
> + return HAVE_LLVM >= 0x900;
> +}
> +
> #ifdef __cplusplus
> }
> #endif
> diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
> index 51f92a6b062..429dac63d63 100644
> --- a/src/amd/common/ac_nir_to_llvm.c
> +++ b/src/amd/common/ac_nir_to_llvm.c
> @@ -1576,7 +1576,8 @@ static void visit_store_ssbo(struct ac_nir_context *ctx,
>
> /* Due to an LLVM limitation with LLVM < 9, split 3-element
> * writes into a 2-element and a 1-element write. */
> - if (count == 3 && (elem_size_bytes != 4 || HAVE_LLVM < 0x900)) {
> + if (count == 3 &&
> + (elem_size_bytes != 4 ||
> !ac_has_vec3_support(ctx->ac.chip_class))) {
> writemask |= 1 << (start + 2);
> count = 2;
> }
> diff --git a/src/amd/vulkan/radv_nir_to_llvm.c
> b/src/amd/vulkan/radv_nir_to_llvm.c
> index dca4bebcdd1..ab552ae34ab 100644
> --- a/src/amd/vulkan/radv_nir_to_llvm.c
> +++ b/src/amd/vulkan/radv_nir_to_llvm.c
> @@ -2768,7 +2768,7 @@ radv_emit_stream_output(struct radv_shader_context *ctx,
> /* fall through */
> case 4: /* as v4i32 */
> vdata = ac_build_gather_values(&ctx->ac, out,
> - HAVE_LLVM < 0x900 ?
> +
> !ac_has_vec3_support(ctx->ac.chip_class) ?
>
> util_next_power_of_two(num_comps) :
> num_comps);
> break;
> --
> 2.21.0
>
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