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2012 Apr 09
1
[LLVMdev] Question about CriticalAntiDepBreaker.cpp
...of the expression needs to be in XMM0 because it is being returned as the function result in that register.
The end of the original code sequence, prior to being processed by CriticalAntiDepBreaker.cpp, is
...
mulps %xmm4, %xmm0
addps %xmm2, %xmm0
.LBB0_3: # %none_on
leaq 904(%rsp), %rsp
ret
The critical anti-dependency breaking code changes XMM0 to XMM9, preventing the proper value from being returned in XMM0.
The program that generates this code is the Intel SPMD Program Compiler (ispc.github.net), which uses LLVM for back end code generation and opt...