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radv: lower primitive shading rate in NIR

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This allows more potential compiler optimizations if the value is a
constant or from a scalar load.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11579>
This commit is contained in:
Samuel Pitoiset
2021-06-24 15:59:45 +02:00
committed by Marge Bot
parent a7e753cb96
commit ee79b87c62
3 changed files with 65 additions and 51 deletions
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25
src/amd/vulkan/radv_nir_to_llvm.c
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@@ -1331,30 +1331,7 @@ radv_llvm_export_vs(struct radv_shader_context *ctx, struct radv_shader_output_v
}
if (outinfo->writes_primitive_shading_rate) {
LLVMValueRef v = ac_to_integer(&ctx->ac, primitive_shading_rate);
LLVMValueRef cond;
/* xRate = (shadingRate & (Horizontal2Pixels | Horizontal4Pixels)) ? 0x1 : 0x0; */
LLVMValueRef x_rate =
LLVMBuildAnd(ctx->ac.builder, v, LLVMConstInt(ctx->ac.i32, 4 | 8, false), "");
cond = LLVMBuildICmp(ctx->ac.builder, LLVMIntNE, x_rate, ctx->ac.i32_0, "");
x_rate = LLVMBuildSelect(ctx->ac.builder, cond, ctx->ac.i32_1, ctx->ac.i32_0, "");
/* yRate = (shadingRate & (Vertical2Pixels | Vertical4Pixels)) ? 0x1 : 0x0; */
LLVMValueRef y_rate =
LLVMBuildAnd(ctx->ac.builder, v, LLVMConstInt(ctx->ac.i32, 1 | 2, false), "");
cond = LLVMBuildICmp(ctx->ac.builder, LLVMIntNE, y_rate, ctx->ac.i32_0, "");
y_rate = LLVMBuildSelect(ctx->ac.builder, cond, ctx->ac.i32_1, ctx->ac.i32_0, "");
/* Bits [2:3] = VRS rate X
* Bits [4:5] = VRS rate Y
* HW shading rate = (xRate << 2) | (yRate << 4)
*/
v = LLVMBuildOr(
ctx->ac.builder,
LLVMBuildShl(ctx->ac.builder, x_rate, LLVMConstInt(ctx->ac.i32, 2, false), ""),
LLVMBuildShl(ctx->ac.builder, y_rate, LLVMConstInt(ctx->ac.i32, 4, false), ""), "");
pos_args[1].out[1] = ac_to_float(&ctx->ac, v);
pos_args[1].out[1] = primitive_shading_rate;
} else if (ctx->args->options->force_vrs_rates) {
/* Bits [2:3] = VRS rate X
* Bits [4:5] = VRS rate Y