Valery Pykhtin 667ba7f8f3 [AMDGPU] Fix GCNRewritePartialRegUses pass: vector regclass is selected instead of scalar. (#69957) ...

For the following testcase:

undef %1.sub1:sgpr_96 = COPY undef %0:sgpr_32
%3:vgpr_32 = V_LSHL_ADD_U32_e64 %1.sub1:sgpr_96, ...

GCNRewritePartialRegUses produced:

%4:vgpr_32 = COPY undef %1:sgpr_32
dead %2:vgpr_32 = V_LSHL_ADD_U32_e64 %4, ...

Register class for %4 is incorrect: there should be sgpr_32 instead of
vgpr_32 because the original %1 had scalar regclass. This patch fixes
that.

Note that GCNRewritePartialRegUses pass isn't enabled by default yet.

2023-11-16 16:56:46 +01:00

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