https://bugs.llvm.org/show_bug.cgi?id=43607
Bug ID: 43607
Summary: [AMDGPU][MC][GFX9] Incorrect handling of
v_cndmask_b32_sdwa with src0=vcc_lo
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]
An example of a failed test:
v_cndmask_b32_sdwa v5, vcc_lo, v2, vcc dst_sel:DWORD
dst_unused:UNUSED_PRESERVE src0_sel:DWORD src1_sel:DWORD
This code violates constant bus restrictions because it uses 2 scalar registers
with a partial intersection. However assembler does not detect this violation
and instead produces the following (invalid) code:
v_cndmask_b32_sdwa v5, v2, vcc, vcc dst_sel:DWORD
dst_unused:UNUSED_PRESERVE src0_sel:DWORD src1_sel:DWORD
This may look like a minor issue but it affects GFX10 where the provided
example should trigger no errors.
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