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.

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 021662e75e05daa5cdc6ef9a90524812a38f1b3d..a09e2a9f0c2fdb71502b51c99a653ba6b93e2614 100644 (file)
--- 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);