search for: isminvalue

Displaying 2 results from an estimated 2 matches for "isminvalue".

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2014 Jul 01
2
[LLVMdev] Probable error in InstCombine
I've found what appears to be a bug in instcombine. Specifically, the transformation of -(X/C) to X/(-C) is invalid if C == INT_MIN. Specifically, if I have > define i32 @foo(i32 %x) #0 { > entry: > %div = sdiv i32 %x, -2147483648 > %sub = sub nsw i32 0, %div > ret i32 %sub > } then opt -instcombine will produce > define i32 @foo(i32 %x) #0 { > entry: > %sub
2008 Jun 05
0
[LLVMdev] A question about CBackend.cpp
...y) 943 Out << CI->getZExtValue() << 'u'; 944 else if (Ty->getPrimitiveSizeInBits() > 32) 945 Out << CI->getZExtValue() << "ull"; 946 else { 947 Out << "(("; 948 printSimpleType(Out, Ty, false) << ')'; 949 if (CI->isMinValue(true)) 950 Out << CI->getZExtValue() << 'u'; 951 else 952 Out << CI->getSExtValue(); 953 Out << ')'; 954 } 955 return; 956 } In line 946 to line 954, the "else" branch is for bitwidth from 2 to 31, the question is why only for CI is MinValue...