nouveau: set lower_sub = true

Subtractions are already implemented as additions anyway.

Reviewed-by: Connor Abbott <[email protected]>

3 files changed, 2 insertions, 6 deletions

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp
index 95b60d2c7d0..bcabeacbbad 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp
@@ -451,9 +451,6 @@ Converter::getOperation(nir_op op)
       return OP_SIN;
    case nir_op_fsqrt:
       return OP_SQRT;
-   case nir_op_fsub:
-   case nir_op_isub:
-      return OP_SUB;
    case nir_op_ftrunc:
       return OP_TRUNC;
    case nir_op_ixor:
@@ -2817,8 +2814,6 @@ Converter::visit(nir_alu_instr *insn)
    case nir_op_ushr:
    case nir_op_fsin:
    case nir_op_fsqrt:
-   case nir_op_fsub:
-   case nir_op_isub:
    case nir_op_ftrunc:
    case nir_op_ishl:
    case nir_op_ixor: {
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 997193aac4a..557139494d4 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -901,6 +901,7 @@ static const nir_shader_compiler_options nir_options = {
    .lower_fpow = false,
    .lower_uadd_carry = true,
    .lower_usub_borrow = true,
+   .lower_sub = true,
    .lower_ffract = true,
    .lower_pack_half_2x16 = true,
    .lower_pack_unorm_2x16 = true,
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index a78b6222c6b..435c3058a89 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -939,7 +939,7 @@ static const nir_shader_compiler_options nir_options = {
    .lower_usub_borrow = true, // TODO
    .lower_mul_high = false,
    .lower_negate = false,
-   .lower_sub = false, // TODO
+   .lower_sub = true,
    .lower_scmp = true, // TODO: not implemented yet
    .lower_idiv = true,
    .lower_isign = false, // TODO