https://bugs.freedesktop.org/show_bug.cgi?id=102032
Bug ID: 102032
Summary: nir_op_imod is incorrectly implemented as LLVM's srem
Product: Mesa
Version: git
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Vulkan/radeon
Assignee: mesa-dev@lists.freedesktop.org
Reporter: programmerj...@gmail.com
QA Contact: mesa-dev@lists.freedesktop.org
nir_op_imod is incorrectly translated to LLVM's srem instruction in
src/amd/common/ac_nir_to_llvm.c:1567.
If you use the operands -1 and 3, nir_op_imod should return 2, however srem
returns -1.
compare with intel's implementation:
https://github.com/mesa3d/mesa/blob/e69e5c7006da80af62c9ef08dec215b3b4b30946/src/intel/compiler/brw_vec4_nir.cpp#L1352
C++ algorithm:
https://godbolt.org/g/pUeEfi
LLVM srem documentation:
https://llvm.org/docs/LangRef.html#srem-instruction
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