http://llvm.org/bugs/show_bug.cgi?id=8286
Summary: Invalid indirect branches processing (x86 asm
printer).
Product: libraries
Version: 2.8
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=5556)
--> (http://llvm.org/bugs/attachment.cgi?id=5556)
bitcode file(for linux x86-64) with a lot of indirect branch instructions
M.bc from attachment can't be compiled:
llc M.bc -o M.s
gcc M.s -lm
/tmp/ccuBJJbW.o:(.rodata+0xf0): undefined reference to `.Ltmp58'
/tmp/ccuBJJbW.o:(.rodata+0x1a0): undefined reference to `.Ltmp59'
collect2: ld error 1
Probably reason - optimization in x86 asm printer, that drops basic blocks
labels without uses. It ignores global variables like this:
@blocks3 = internal constant [4 x i8*] [i8* blockaddress(@cffti, %bb), i8*
blockaddress(@cffti, %bb1), i8* blockaddress(@cffti, %return), i8*
blockaddress(@cffti, %return)] ; <[4 x i8*]*> [#uses=1]
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