tree 5bdc461ac6acbfc2618ca9898e7f477172e27b6e
parent d724bab8064685c98cdded88157b6e2245e0d7bc
author Jay Foad <jay.foad@amd.com> 1743025258 +0000
committer GitHub <noreply@github.com> 1743025258 +0000
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[TableGen] Speed up inferMatchingSuperRegClass. NFC. (#133060)

SubToSuperRegs was a DenseMap of std::vectors, where the vectors
typically had size 1. Switching to a vector of pairs avoids the overhead
of allocating tiny vectors.

I measured a 1.14x speed-up building AMDGPUGenRegisterInfo.inc with this
patch.