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Enable folding of long seteq/setne comparisons into branches and select instructions Implement unfolded long relational comparisons against a constants a bit more efficiently Folding comparisons changes code that looks like this: mov %EAX, DWORD PTR [%ESP + 4] mov %EDX, DWORD PTR [%ESP + 8] mov %ECX, %EAX or %ECX, %EDX sete %CL test %CL, %CL je .LBB2 # PC rel: F into code that looks like this: mov %EAX, DWORD PTR [%ESP + 4] mov %EDX, DWORD PTR [%ESP + 8] mov %ECX, %EAX or %ECX, %EDX jne .LBB2 # PC rel: F This speeds up 186.crafty by 6% with llc-ls. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12702 91177308-0d34-0410-b5e6-96231b3b80d8 |
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