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timj
2018 Apr 06
0
[InstCombine] Missed optimizations when null check before return statement
Hello,
Please check code:
https://godbolt.org/g/wtimXj
Clang surprisingly generates worse code for common pattern
if (!ptr)
return NULL;
than for
if (!ptr)
return ptr;
Gcc generates same code.
I checked the InstCombine's code and tried something to fix it but no
success.
So I will leave this here for more skilled developers and maybe t...