radeonsi: add a workaround for a bug in LLVM <= 3.8

This is not directly applicable to stable and needs to be backported.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 6166403..3df7820 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -556,6 +556,13 @@ static LLVMValueRef get_bounded_indirect_index(struct si_shader_context *ctx,
        LLVMValueRef c_max = LLVMConstInt(ctx->i32, num - 1, 0);
        LLVMValueRef cc;
 
+       /* LLVM 3.8: If indirect resource indexing is used:
+        * - SI & CIK hang
+        * - VI crashes
+        */
+       if (HAVE_LLVM <= 0x0308)
+               return LLVMGetUndef(ctx->i32);
+
        if (util_is_power_of_two(num)) {
                result = LLVMBuildAnd(builder, result, c_max, "");
        } else {