shader: use different variable declarations for signed and unsigned (I|U)MUL_HI

(i|u)mulextended require that the all parameters are of the same
signedness. Accordingly create both, the output variabale for MSB and
the (unused) variable for the LSB to be of the same corresponding
signedness. Closes: #17

Fixes:
  dEQP-
GLES31.functional.shaders.builtin_functions.integer.imulextended.*

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>

src/vrend_shader.c

@@ -207,7 +207,8 @@ struct dump_ctx {
    bool has_clipvertex;
    bool has_clipvertex_so;
    bool vs_has_pervertex;
-   bool write_mul_temp;
+   bool write_mul_utemp;
+   bool write_mul_itemp;
    bool has_sample_input;
    bool early_depth_stencil;
 
@@ -3815,20 +3816,20 @@ iter_instruction(struct tgsi_iterate_context *iter,
       ctx->shader_req_bits |= SHADER_REQ_GPU_SHADER5;
       break;
    case TGSI_OPCODE_UMUL_HI:
-      snprintf(buf, 255, "umulExtended(%s, %s, umul_temp, mul_temp);\n", srcs[0], srcs[1]);
+      snprintf(buf, 255, "umulExtended(%s, %s, umul_temp, mul_utemp);\n", srcs[0], srcs[1]);
       EMIT_BUF_WITH_RET(ctx, buf);
       snprintf(buf, 255, "%s = %s(%s(umul_temp));\n", dsts[0], get_string(dinfo.dstconv), get_string(dinfo.dtypeprefix));
       EMIT_BUF_WITH_RET(ctx, buf);
       ctx->shader_req_bits |= SHADER_REQ_GPU_SHADER5;
-      ctx->write_mul_temp = true;
+      ctx->write_mul_utemp = true;
       break;
    case TGSI_OPCODE_IMUL_HI:
-      snprintf(buf, 255, "imulExtended(%s, %s, imul_temp, mul_temp);\n", srcs[0], srcs[1]);
+      snprintf(buf, 255, "imulExtended(%s, %s, imul_temp, mul_itemp);\n", srcs[0], srcs[1]);
       EMIT_BUF_WITH_RET(ctx, buf);
       snprintf(buf, 255, "%s = %s(%s(imul_temp));\n", dsts[0], get_string(dinfo.dstconv), get_string(dinfo.dtypeprefix));
       EMIT_BUF_WITH_RET(ctx, buf);
       ctx->shader_req_bits |= SHADER_REQ_GPU_SHADER5;
-      ctx->write_mul_temp = true;
+      ctx->write_mul_itemp = true;
       break;
 
    case TGSI_OPCODE_IBFE:
@@ -4688,11 +4689,16 @@ static char *emit_ios(struct dump_ctx *ctx, char *glsl_hdr)
       STRCAT_WITH_RET(glsl_hdr, buf);
    }
 
-   if (ctx->write_mul_temp) {
-      snprintf(buf, 255, "uvec4 mul_temp;\n");
+   if (ctx->write_mul_utemp) {
+      snprintf(buf, 255, "uvec4 mul_utemp;\n");
       STRCAT_WITH_RET(glsl_hdr, buf);
       snprintf(buf, 255, "uvec4 umul_temp;\n");
       STRCAT_WITH_RET(glsl_hdr, buf);
+   }
+
+   if (ctx->write_mul_itemp) {
+      snprintf(buf, 255, "ivec4 mul_itemp;\n");
+      STRCAT_WITH_RET(glsl_hdr, buf);
       snprintf(buf, 255, "ivec4 imul_temp;\n");
       STRCAT_WITH_RET(glsl_hdr, buf);
    }