https://bugs.llvm.org/show_bug.cgi?id=51217
Bug ID: 51217
Summary: [DAG][AMDGPU] Canonicalization of mulh constants to
rhs causes verifier errors
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AMDGPU
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected],
[email protected]
Created attachment 25070
--> https://bugs.llvm.org/attachment.cgi?id=25070&action=edit
Canonicalise MULHS/U constants to the RHS
As detailed on D106471, attempting to canonicalize mulh constants to rhs
causes:
*** Bad machine code: VOP* instruction violates constant bus restriction ***
- function: v_test_sdiv_k_num_i64
- basic block: %bb.0 (0x238f3f455f0)
- instruction: %160:vgpr_32 = V_ADDC_U32_e32 %70:sreg_32, %161:vgpr_32,
implicit-def dead $vcc, implicit $vcc, implicit $exec
Failed Tests (4):
LLVM :: CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll
LLVM :: CodeGen/AMDGPU/sdiv64.ll
LLVM :: CodeGen/AMDGPU/srem64.ll
LLVM :: CodeGen/AMDGPU/udiv64.ll
I only saw it on sdiv64.ll and srem64.ll (I'm not sure but this might require
EXPENSIVE_CHECKS to be enabled).
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