diff options
| author | Roland Scheidegger <[email protected]> | 2018-03-02 03:00:41 +0100 |
|---|---|---|
| committer | Roland Scheidegger <[email protected]> | 2018-03-06 05:18:17 +0100 |
| commit | 06e724c7b4ade29868531edb20900859f566a077 (patch) | |
| tree | 3bc0c19b2094ba6e035a0ce85dc2c35cecc59de0 /src/gallium/auxiliary/tgsi/tgsi_scan.c | |
| parent | 95ae6c0355379127706e516d177f7f6ee8296d48 (diff) | |
tgsi/scan: use wrap-around shift behavior explicitly for file_mask
The comment said it will only represent the lowest 32 regs. This was
not entirely true in practice, since at least on x86 you'll get
masked shifts (unless the compiler could recognize it already and toss
it out). It turns out this actually works out alright (presumably
noone uses it for temp regs) when increasing max sampler views, so
make that behavior explicit.
Albeit it feels a bit hacky (but in any case, explicit behavior there
is better than undefined behavior).
Reviewed-by: Jose Fonseca <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_scan.c')
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_scan.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c index c35eff25ba8..4a2b3540639 100644 --- a/src/gallium/auxiliary/tgsi/tgsi_scan.c +++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c @@ -585,8 +585,11 @@ scan_declaration(struct tgsi_shader_info *info, int buffer; unsigned index, target, type; - /* only first 32 regs will appear in this bitfield */ - info->file_mask[file] |= (1 << reg); + /* + * only first 32 regs will appear in this bitfield, if larger + * bits will wrap around. + */ + info->file_mask[file] |= (1u << (reg & 31)); info->file_count[file]++; info->file_max[file] = MAX2(info->file_max[file], (int)reg); |