From: Jonathan White <jwhite@tungstengraphics.com>
Date: Mon, 22 Sep 2008 16:54:50 +0000 (-0600)
Subject: cell: Added DPH instruction and verified against softpipe.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=56c476395ffdff2cfbc0adb9b87e5b308ee3066a;p=mesa.git

cell: Added DPH instruction and verified against softpipe.
---

diff --git a/src/gallium/drivers/cell/ppu/cell_gen_fp.c b/src/gallium/drivers/cell/ppu/cell_gen_fp.c
index 1bc803d5908..f4e651c8ebf 100644
--- a/src/gallium/drivers/cell/ppu/cell_gen_fp.c
+++ b/src/gallium/drivers/cell/ppu/cell_gen_fp.c
@@ -633,6 +633,45 @@ emit_DP4(struct codegen *gen, const struct tgsi_full_instruction *inst)
    return true;
 }
 
+/**
+ * Emit homogeneous dot product.  See emit_ADD for comments.
+ */
+static boolean
+emit_DPH(struct codegen *gen, const struct tgsi_full_instruction *inst)
+{
+   int ch;
+   spe_comment(gen->f, -4, "DPH:");
+
+   int s1_reg = get_src_reg(gen, CHAN_X, &inst->FullSrcRegisters[0]);
+   int s2_reg = get_src_reg(gen, CHAN_X, &inst->FullSrcRegisters[1]);
+   int d_reg = get_dst_reg(gen, CHAN_X, &inst->FullDstRegisters[0]);
+   /* d = x * x */
+   spe_fm(gen->f, d_reg, s1_reg, s2_reg);
+
+   s1_reg = get_src_reg(gen, CHAN_Y, &inst->FullSrcRegisters[0]);
+   s2_reg = get_src_reg(gen, CHAN_Y, &inst->FullSrcRegisters[1]);
+   /* d = y * y + d */
+   spe_fma(gen->f, d_reg, s1_reg, s2_reg, d_reg);
+
+   s1_reg = get_src_reg(gen, CHAN_Z, &inst->FullSrcRegisters[0]);
+   s2_reg = get_src_reg(gen, CHAN_Z, &inst->FullSrcRegisters[1]);
+   /* d = z * z + d */
+   spe_fma(gen->f, d_reg, s1_reg, s2_reg, d_reg);
+
+   s2_reg = get_src_reg(gen, CHAN_W, &inst->FullSrcRegisters[1]);
+   /* d = w + d */
+   spe_fa(gen->f, d_reg, s2_reg, d_reg);
+
+   for (ch = 0; ch < 4; ch++) {
+      if (inst->FullDstRegisters[0].DstRegister.WriteMask & (1 << ch)) {
+         store_dest_reg(gen, d_reg, ch, &inst->FullDstRegisters[0]);
+      }
+   }
+
+   free_itemps(gen);
+   return true;
+}
+
 /**
  * Emit set-if-greater-than.
  * Note that the SPE fcgt instruction produces 0x0 and 0xffffffff as
@@ -1124,6 +1163,8 @@ emit_instruction(struct codegen *gen,
       return emit_DP3(gen, inst);
    case TGSI_OPCODE_DP4:
       return emit_DP4(gen, inst);
+   case TGSI_OPCODE_DPH:
+      return emit_DPH(gen, inst);
    case TGSI_OPCODE_RCP:
       return emit_RCP(gen, inst);
    case TGSI_OPCODE_RSQ: