radeonsi: use shared emit imsb code.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/drivers/radeonsi/si_shader_tgsi_alu.c b/src/gallium/drivers/radeonsi/si_shader_tgsi_alu.c
index 085fd5bd0f9a6f675172af6c6d5c5850738ed5fc..879deb136e3de8a4bff3c4422fc000ee613a49e1 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader_tgsi_alu.c
+++ b/src/gallium/drivers/radeonsi/si_shader_tgsi_alu.c
@@ -586,32 +586,10 @@ static void emit_imsb(const struct lp_build_tgsi_action *action,
                      struct lp_build_tgsi_context *bld_base,
                      struct lp_build_emit_data *emit_data)
 {
-       struct gallivm_state *gallivm = bld_base->base.gallivm;
-       LLVMBuilderRef builder = gallivm->builder;
-       LLVMValueRef arg = emit_data->args[0];
-
-       LLVMValueRef msb =
-               lp_build_intrinsic(builder, "llvm.AMDGPU.flbit.i32",
-                               emit_data->dst_type, &arg, 1,
-                               LP_FUNC_ATTR_READNONE);
-
-       /* The HW returns the last bit index from MSB, but TGSI wants
-        * the index from LSB. Invert it by doing "31 - msb". */
-       msb = LLVMBuildSub(builder, lp_build_const_int32(gallivm, 31),
-                          msb, "");
-
-       /* If arg == 0 || arg == -1 (0xffffffff), return -1. */
-       LLVMValueRef all_ones = lp_build_const_int32(gallivm, -1);
-
-       LLVMValueRef cond =
-               LLVMBuildOr(builder,
-                           LLVMBuildICmp(builder, LLVMIntEQ, arg,
-                                         bld_base->uint_bld.zero, ""),
-                           LLVMBuildICmp(builder, LLVMIntEQ, arg,
-                                         all_ones, ""), "");
-
+       struct si_shader_context *ctx = si_shader_context(bld_base);
        emit_data->output[emit_data->chan] =
-               LLVMBuildSelect(builder, cond, all_ones, msb, "");
+               ac_emit_imsb(&ctx->ac, emit_data->args[0],
+                            emit_data->dst_type);
 }
 
 static void emit_iabs(const struct lp_build_tgsi_action *action,