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TwoAddressInstructionPass: Modernize/fix some comments; NFC

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llvm-svn: 344006
This commit is contained in:
Matthias Braun 2018-10-08 23:47:35 +00:00
parent ae541b0e31
commit f13d37d886
1 changed files with 5 additions and 5 deletions
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10
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -592,17 +592,17 @@ isProfitableToCommute(unsigned regA, unsigned regB, unsigned regC,
// the two-address register.
// e.g.
// %reg1028 = EXTRACT_SUBREG killed %reg1027, 1
// %reg1029 = MOV8rr %reg1028
// %reg1029 = COPY %reg1028
// %reg1029 = SHR8ri %reg1029, 7, implicit dead %eflags
// insert => %reg1030 = MOV8rr %reg1028
// insert => %reg1030 = COPY %reg1028
// %reg1030 = ADD8rr killed %reg1028, killed %reg1029, implicit dead %eflags
// In this case, it might not be possible to coalesce the second MOV8rr
// In this case, it might not be possible to coalesce the second COPY
// instruction if the first one is coalesced. So it would be profitable to
// commute it:
// %reg1028 = EXTRACT_SUBREG killed %reg1027, 1
// %reg1029 = MOV8rr %reg1028
// %reg1029 = COPY %reg1028
// %reg1029 = SHR8ri %reg1029, 7, implicit dead %eflags
// insert => %reg1030 = MOV8rr %reg1029
// insert => %reg1030 = COPY %reg1029
// %reg1030 = ADD8rr killed %reg1029, killed %reg1028, implicit dead %eflags
if (!isPlainlyKilled(MI, regC, LIS))