From bb67c467a48f89177cf5a1c9904a627704ea7844 Mon Sep 17 00:00:00 2001 From: Francisco Jerez Date: Mon, 16 May 2016 00:59:37 -0700 Subject: [PATCH] i965/fs: Set exec_all on unspills. This makes sure that unspills restore the exact contents of the variable in scratch space into the GRF without applying channel masking, which is incorrect under control flow for things like message headers or vectors of heterogeneous types that don't properly respect channel boundaries. Reviewed-by: Jason Ekstrand --- src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp index 099df8b..bc847bf 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp @@ -944,8 +944,16 @@ fs_visitor::spill_reg(int spill_reg) const unsigned width = dispatch_width == 16 && regs_read % 2 == 0 ? 16 : 8; - emit_unspill(ibld.group(width, 0), unspill_dst, - subset_spill_offset, regs_read); + + /* Set exec_all() on unspill messages under the (rather + * pessimistic) assumption that there is no one-to-one + * correspondence between channels of the spilled variable in + * scratch space and the scratch read message, which operates on + * 32 bit channels. It shouldn't hurt in any case because the + * unspill destination is a block-local temporary. + */ + emit_unspill(ibld.exec_all().group(width, 0), + unspill_dst, subset_spill_offset, regs_read); } } -- 2.7.4