http://llvm.org/bugs/show_bug.cgi?id=10802
Summary: Incorrect code generated for uitofp with x86 target
(x86-64 is fine)
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=7178)
--> (http://llvm.org/bugs/attachment.cgi?id=7178)
test case, part 1
The attached test program basically computes the i32 value 1 and then converts
it to a float (with enough obfuscation so that the optimizer doesn't just do
the conversion itself.) With top of tree, when compiled with the x86-64
target, it prints 1.0, as expected:
% llc -march=x86-64 -filetype=obj -o bug.o bug.ll && g++ -m64 bug.cpp bug.o &&
./a.out
1.000000
%
With the 32-bit x86 target, it seems to generate incorrect code for the
conversion:
% llc -march=x86 -filetype=obj -o bug.o bug.ll && g++ -Wl,-no_pie -m32 bug.cpp
bug.o && ./a.out
4294967296.000000
%
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