[Mesa-dev] [PATCH 2/3] r600g: use fdiv instruction for TGSI_OPCODE_DIV/RCP

[Vincent Lejeune]

---
 src/gallium/drivers/r600/r600_llvm.c               | 22 ++++++++++++++++++++++
 .../drivers/radeon/radeon_setup_tgsi_llvm.c        |  4 ++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_llvm.c 
b/src/gallium/drivers/r600/r600_llvm.c
index 350527b..2056b91 100644
--- a/src/gallium/drivers/r600/r600_llvm.c
+++ b/src/gallium/drivers/r600/r600_llvm.c
@@ -408,6 +408,26 @@ static void llvm_fmad(
                emit_data->args[2], "");
 }
 
+static void llvm_fdiv(
+const struct lp_build_tgsi_action * action,
+struct lp_build_tgsi_context * bld_base,
+struct lp_build_emit_data * emit_data)
+{
+       LLVMBuilderRef builder = bld_base->base.gallivm->builder;
+       emit_data->output[emit_data->chan] = LLVMBuildFDiv(builder,
+               emit_data->args[0], emit_data->args[1], "");
+}
+
+static void llvm_frcp(
+const struct lp_build_tgsi_action * action,
+struct lp_build_tgsi_context * bld_base,
+struct lp_build_emit_data * emit_data)
+{
+       LLVMBuilderRef builder = bld_base->base.gallivm->builder;
+       emit_data->output[emit_data->chan] = LLVMBuildFDiv(builder,
+               lp_build_const_float(bld_base->base.gallivm, 1.0f), 
emit_data->args[0], "");
+}
+
 static struct lp_build_tgsi_action dot_action = {
        .fetch_args = dp_fetch_args,
        .emit = build_tgsi_intrinsic_nomem,
@@ -451,6 +471,8 @@ LLVMModuleRef r600_tgsi_llvm(
        bld_base->op_actions[TGSI_OPCODE_CMP].emit = emit_cndlt;
        bld_base->op_actions[TGSI_OPCODE_MUL].emit = llvm_fmul;
        bld_base->op_actions[TGSI_OPCODE_MAD].emit = llvm_fmad;
+       bld_base->op_actions[TGSI_OPCODE_DIV].emit = llvm_fdiv;
+       bld_base->op_actions[TGSI_OPCODE_RCP].emit = llvm_frcp;
 
        lp_build_tgsi_llvm(bld_base, tokens);
 
diff --git a/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c 
b/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
index cbcebbc..93d3009 100644
--- a/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
+++ b/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
@@ -540,8 +540,8 @@ static void emit_prepare_cube_coords(
 
        coords[2] = build_intrinsic(builder, "fabs",
                        type, &coords[2], 1, LLVMReadNoneAttribute);
-       coords[2] = build_intrinsic(builder, "llvm.AMDGPU.rcp",
-                       type, &coords[2], 1, LLVMReadNoneAttribute);
+       coords[2] = LLVMBuildFDiv(builder, lp_build_const_float(gallivm, 1.0f),
+                       coords[2], "");
 
        mad_args[1] = coords[2];
        mad_args[2] = LLVMConstReal(type, 1.5);
-- 
1.8.0

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