https://bugs.llvm.org/show_bug.cgi?id=33279
Bug ID: 33279
Summary: [mc] V_*QSAD_PK_* to check that dest register is
different than any of the src
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],
[email protected]
Quote from [https://reviews.llvm.org/D33783]:
The V_MQSAD_PK_U16_U8, V_QSAD_PK_U16_U8, and V_MQSAD_U32_U8 take more than 1
pass in hardware. For these three instructions, the destination registers must
be different than all sources so that the first pass does not overwrite sources
for the following passes.
It seems that we have missed that check in the assembler.
Perhaps TestGen also needs to be updated.
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