[llvm-dev] How to handle UMULO?
陳韋任 via llvm-dev
llvm-dev at lists.llvm.org
Wed Feb 28 05:31:38 PST 2018
While compiling libgcc, I find I have to deal with UMULO (overflow-aware
unsigned multiplication) SDNode. UMULO returns the result of
multiplication, and a boolean indicating overflow occurred or not. Our
target's multiply instruction doesn't care (detect) overflow. I am
wondering if I can always set the boolean to false. I am not sure about
this as I see AArch64  seems trying to emulate the overflow behavior.
Wei-Ren Chen (陳韋任)
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