http://llvm.org/bugs/show_bug.cgi?id=2856
Summary: x86_fp80 NaN constants emitted inconsistently
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Keywords: miscompilation
Severity: normal
Priority: P2
Component: Backend: X86
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=2054)
--> (http://llvm.org/bugs/attachment.cgi?id=2054)
test case
The compiling and executing the attached LLVM IR prints
7FFF400000000
7FFFC00000000
even though the x86_fp80 constants used are identical
(0xK7FFF4000000000000000).
The relevant sections in the asm output are
the in-line constant (0x7FC00000):
.LCPI2_0:
.long 2143289344 # float nan
the global (0x7FFF400000000000)
_D3nan4rvale:
.size _D3nan4rvale, 12
.short 0 # long double least significant halfword of ~nan
.short 0 # long double next halfword
.short 0 # long double next halfword
.short 16384 # long double next halfword
.short 32767 # long double most significant halfword
.zero 2
and they should describe the same value, but don't.
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