gallium: add separate PIPE_CAP_INT64_DIVMOD

Nouveau does not currently have logic to implement this as a library
function. Even though such a library could be written, there's no big
advantage to do it that way for now given that int64 is a very uncommon
use-case. Allow a driver to expose INT64 without supporting division and
modulo operations.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/docs/source/screen.rst

@@ -376,6 +376,8 @@ The integer capabilities:
 * ``PIPE_CAP_DOUBLES``: Whether double precision floating-point operations
   are supported.
 * ``PIPE_CAP_INT64``: Whether 64-bit integer operations are supported.
+* ``PIPE_CAP_INT64_DIVMOD``: Whether 64-bit integer division/modulo
+  operations are supported.
 
 
 .. _pipe_capf:

src/gallium/drivers/etnaviv/etnaviv_screen.c

@@ -243,6 +243,7 @@ etna_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
 
    /* Stream output. */

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -300,6 +300,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_MUL_ZERO_WINS:
 	case PIPE_CAP_DOUBLES:
 	case PIPE_CAP_INT64:
+	case PIPE_CAP_INT64_DIVMOD:
 		return 0;
 
 	case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/i915/i915_screen.c

@@ -300,6 +300,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
 
    case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -269,6 +269,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 1;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -210,6 +210,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -262,6 +262,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FBFETCH:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -282,6 +282,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_NATIVE_FENCE_FD:
    case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/r300/r300_screen.c

@@ -232,6 +232,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_TGSI_MUL_ZERO_WINS:
         case PIPE_CAP_DOUBLES:
         case PIPE_CAP_INT64:
+        case PIPE_CAP_INT64_DIVMOD:
             return 0;
 
         /* SWTCL-only features. */

src/gallium/drivers/r600/r600_pipe.c

@@ -379,6 +379,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
 	case PIPE_CAP_TGSI_FS_FBFETCH:
 	case PIPE_CAP_INT64:
+	case PIPE_CAP_INT64_DIVMOD:
 		return 0;
 
 	case PIPE_CAP_DOUBLES:

src/gallium/drivers/radeonsi/si_pipe.c

@@ -419,6 +419,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_DOUBLES:
 		return HAVE_LLVM >= 0x0307;
 	case PIPE_CAP_INT64:
+	case PIPE_CAP_INT64_DIVMOD:
 		return HAVE_LLVM >= 0x0309;
 
 	case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:

src/gallium/drivers/softpipe/sp_screen.c

@@ -167,6 +167,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 1;
    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
       return 16;

src/gallium/drivers/svga/svga_screen.c

@@ -426,6 +426,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
    }
 

src/gallium/drivers/swr/swr_screen.cpp

@@ -318,6 +318,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FBFETCH:
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/vc4/vc4_screen.c

@@ -246,6 +246,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_TGSI_MUL_ZERO_WINS:
         case PIPE_CAP_DOUBLES:
         case PIPE_CAP_INT64:
+        case PIPE_CAP_INT64_DIVMOD:
                 return 0;
 
                 /* Stream output. */

src/gallium/drivers/virgl/virgl_screen.c

@@ -255,6 +255,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FBFETCH:
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
       return 0;
    case PIPE_CAP_VENDOR_ID:
       return 0x1af4;

src/gallium/include/pipe/p_defines.h

@@ -754,6 +754,7 @@ enum pipe_cap
    PIPE_CAP_TGSI_MUL_ZERO_WINS,
    PIPE_CAP_DOUBLES,
    PIPE_CAP_INT64,
+   PIPE_CAP_INT64_DIVMOD,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -7042,6 +7042,9 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
                                              options->EmitNoIndirectUniform);
       }
 
+      if (!pscreen->get_param(pscreen, PIPE_CAP_INT64_DIVMOD))
+         lower_64bit_integer_instructions(ir, DIV64 | MOD64);
+
       if (ctx->Extensions.ARB_shading_language_packing) {
          unsigned lower_inst = LOWER_PACK_SNORM_2x16 |
                                LOWER_UNPACK_SNORM_2x16 |