draw llvm: fix iteration for larger vertex arrays

we were trying to store the outputs starting at the same offset we
were using for the input arrays, which was writing beyond the end of
the output array.

1 files changed, 8 insertions, 8 deletions

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 021662e75e0..a09e2a9f0c2 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -17,7 +17,7 @@
 
 #include <llvm-c/Transforms/Scalar.h>
 
-#define DEBUG_STORE 0
+#define DEBUG_STORE 1
 
 static void
 init_globals(struct draw_llvm *llvm)
@@ -481,7 +481,7 @@ store_aos_array(LLVMBuilderRef builder,
                           &ind3, 1, "");
 
 #if DEBUG_STORE
-   lp_build_printf(builder, "io = %p, indexes[%d, %d, %d, %d]\n",
+   lp_build_printf(builder, "   io = %p, indexes[%d, %d, %d, %d]\n",
                    io_ptr, ind0, ind1, ind2, ind3);
 #endif
 
@@ -592,7 +592,6 @@ draw_llvm_generate(struct draw_llvm *llvm)
 
    step = LLVMConstInt(LLVMInt32Type(), max_vertices, 0);
 
-   io_itr = LLVMConstInt(LLVMInt32Type(), 0, 0);
 #if DEBUG_STORE
    lp_build_printf(builder, "start = %d, end = %d, step = %d\n",
                    start, end, step);
@@ -601,11 +600,14 @@ draw_llvm_generate(struct draw_llvm *llvm)
    {
       LLVMValueRef inputs[PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
       LLVMValueRef aos_attribs[PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
-      LLVMValueRef io = LLVMBuildGEP(builder, io_ptr, &io_itr, 1, "");
+      LLVMValueRef io;
       const LLVMValueRef (*ptr_aos)[NUM_CHANNELS];
+
+      io_itr = LLVMBuildSub(builder, lp_loop.counter, start, "");
+      io = LLVMBuildGEP(builder, io_ptr, &io_itr, 1, "");
 #if DEBUG_STORE
-      lp_build_printf(builder, " --- loop counter %d\n",
-                      lp_loop.counter);
+      lp_build_printf(builder, " --- io %d = %p, loop counter %d\n",
+                      io_itr, io, lp_loop.counter);
 #endif
       for (i = 0; i < NUM_CHANNELS; ++i) {
          LLVMValueRef true_index = LLVMBuildAdd(
@@ -633,8 +635,6 @@ draw_llvm_generate(struct draw_llvm *llvm)
       convert_to_aos(builder, io, outputs,
                      draw->vs.vertex_shader->info.num_outputs,
                      max_vertices);
-
-      io_itr = LLVMBuildAdd(builder, io_itr, step, "");
    }
    lp_build_loop_end_cond(builder, end, step, LLVMIntUGE, &lp_loop);