diff options
| author | Timur Kristóf <[email protected]> | 2019-10-23 11:24:53 +0200 |
|---|---|---|
| committer | Timur Kristóf <[email protected]> | 2019-10-25 10:10:42 +0200 |
| commit | e5a8616973d45909a75a708f88dfb9c3cbb5ded8 (patch) | |
| tree | 58abe54a28de4e468db324b5836cbcb3d3f04cb0 /src/amd/compiler/README | |
| parent | 99aed688d346e26b23e2e00cb6f7df9be3415ccb (diff) | |
aco/gfx10: Mitigate VcmpxPermlaneHazard.
Any permlane instruction that follows any VOPC instruction can cause a hazard,
this commit implements a workaround that avoids this causing a problem.
Signed-off-by: Timur Kristóf <[email protected]>
Reviewed-by: Daniel Schürmann <[email protected]>
Diffstat (limited to 'src/amd/compiler/README')
| -rw-r--r-- | src/amd/compiler/README | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/amd/compiler/README b/src/amd/compiler/README index 630f1fcd42a..d3ecc896bc4 100644 --- a/src/amd/compiler/README +++ b/src/amd/compiler/README @@ -173,3 +173,11 @@ The 12-bit immediate OFFSET field of FLAT instructions must always be 0. GLOBAL and SCRATCH are unaffected. ACO doesn't use FLAT load/store on GFX10, so is unaffected. + +### VcmpxPermlaneHazard + +Triggered by: +Any permlane instruction that follows any VOPC instruction. +Confirmed by AMD devs that despite the name, this doesn't only affect v_cmpx. + +Mitigated by: any VALU instruction except `v_nop`. |