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1. If part of a register is re-defined, an implicit kill and an implicit def are added to denote read / mod / write. However, this should only be necessary if the register is actually read later. This is a performance issue. 2. If a sub-register is being defined, and it doesn't have a previous use, do not add a implicit kill to the last use of a super-register: = EAX, AX<imp-use,kill> ... AX = In this case, EAX is live but AX is killed, this is wrong and will cause the coalescer to do bad things. llvm-svn: 48521
9 lines
163 B
LLVM
9 lines
163 B
LLVM
; RUN: llvm-as < %s | llc -march=x86-64 | grep mov | count 1
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define i32 @f() nounwind {
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tail call void @t( i32 1 ) nounwind
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ret i32 0
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}
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declare void @t(i32)
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