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regB = move RCX regA = op regB, regC RAX = move regA where both regB and regC are killed. If regB is constrainted to non-compatible physical registers but regC is not constrainted at all, then it's better to commute the instruction. movl %edi, %eax shlq $32, %rcx leaq (%rcx,%rax), %rax => movl %edi, %eax shlq $32, %rcx orq %rcx, %rax rdar://8762995 llvm-svn: 121793 |
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