diff options
| author | Kenneth Graunke <[email protected]> | 2017-04-22 15:02:08 -0700 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2017-04-24 10:53:49 -0700 |
| commit | 6b10c37b9c3a73add73f444fe1aee73c9ec82c94 (patch) | |
| tree | 078a9870ef6ec30b1d75fee71a6d83150a42655a /src/intel/compiler | |
| parent | 11db3d10bbab2fac0e7a1dfef08df72760b6badc (diff) | |
i965/vec4: Use reads_accumulator_implicitly(), not MACH checks.
Curro pointed out that I should not just check for MACH, but use
the reads_accumulator_implicitly() helper, which would also prevent
the same bug with MAC and SADA2 (if we ever decide to use them).
Cc: [email protected]
Reviewed-by: Francisco Jerez <[email protected]>
Diffstat (limited to 'src/intel/compiler')
| -rw-r--r-- | src/intel/compiler/brw_vec4.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/intel/compiler/brw_vec4.cpp b/src/intel/compiler/brw_vec4.cpp index 4bb774bf10e..0909ddb5861 100644 --- a/src/intel/compiler/brw_vec4.cpp +++ b/src/intel/compiler/brw_vec4.cpp @@ -1071,11 +1071,11 @@ vec4_instruction::can_reswizzle(const struct gen_device_info *devinfo, if (devinfo->gen == 6 && is_math() && swizzle != BRW_SWIZZLE_XYZW) return false; - /* Don't touch MACH - it uses the accumulator results from an earlier - * MUL - so we'd need to reswizzle both. We don't do that, so just - * avoid it entirely. + /* We can't swizzle implicit accumulator access. We'd have to + * reswizzle the producer of the accumulator value in addition + * to the consumer (i.e. both MUL and MACH). Just skip this. */ - if (opcode == BRW_OPCODE_MACH) + if (reads_accumulator_implicitly()) return false; if (!can_do_writemask(devinfo) && dst_writemask != WRITEMASK_XYZW) |