Fix a minor bug in previous checking
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
2 files changed