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ac/nir: add support for discard_if intrinsic (v2)

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We are going to start lowering to this in NIR code,
so prepare radv for it.

v2: handle conversion to kilp properly (nha)

Cc: "13.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2016-11-02 01:21:15 +00:00
parent b3a29f2e9e
commit dd77faeca2
1 changed files with 21 additions and 0 deletions
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21
src/amd/common/ac_nir_to_llvm.c
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@ -2610,6 +2610,24 @@ static void emit_barrier(struct nir_to_llvm_context *ctx)
ctx->voidt, NULL, 0, 0);
}
static void emit_discard_if(struct nir_to_llvm_context *ctx,
nir_intrinsic_instr *instr)
{
LLVMValueRef cond;
ctx->shader_info->fs.can_discard = true;
cond = LLVMBuildICmp(ctx->builder, LLVMIntNE,
get_src(ctx, instr->src[0]),
ctx->i32zero, "");
cond = LLVMBuildSelect(ctx->builder, cond,
LLVMConstReal(ctx->f32, -1.0f),
ctx->f32zero, "");
emit_llvm_intrinsic(ctx, "llvm.AMDGPU.kill",
LLVMVoidTypeInContext(ctx->context),
&cond, 1, 0);
}
static LLVMValueRef
visit_load_local_invocation_index(struct nir_to_llvm_context *ctx)
{
@ -2922,6 +2940,9 @@ static void visit_intrinsic(struct nir_to_llvm_context *ctx,
LLVMVoidTypeInContext(ctx->context),
NULL, 0, 0);
break;
case nir_intrinsic_discard_if:
emit_discard_if(ctx, instr);
break;
case nir_intrinsic_memory_barrier:
emit_waitcnt(ctx);
break;