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LiveVariableAnalysis was a bit picky about a register only being redefined once, but that really isn't necessary. Here is an example of chained INSERT_SUBREGs that we can handle now: 68 %reg1040<def> = INSERT_SUBREG %reg1040, %reg1028<kill>, 14 register: %reg1040 +[70,134:0) 76 %reg1040<def> = INSERT_SUBREG %reg1040, %reg1029<kill>, 13 register: %reg1040 replace range with [70,78:1) RESULT: %reg1040,0.000000e+00 = [70,78:1)[78,134:0) 0@78-(134) 1@70-(78) 84 %reg1040<def> = INSERT_SUBREG %reg1040, %reg1030<kill>, 12 register: %reg1040 replace range with [78,86:2) RESULT: %reg1040,0.000000e+00 = [70,78:1)[78,86:2)[86,134:0) 0@86-(134) 1@70-(78) 2@78-(86) 92 %reg1040<def> = INSERT_SUBREG %reg1040, %reg1031<kill>, 11 register: %reg1040 replace range with [86,94:3) RESULT: %reg1040,0.000000e+00 = [70,78:1)[78,86:2)[86,94:3)[94,134:0) 0@94-(134) 1@70-(78) 2@78-(86) 3@86-(94) rdar://problem/8096390 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106152 91177308-0d34-0410-b5e6-96231b3b80d8 |
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