X86 Assert: Cannot pop empty stack

[llvmbot]

Bugzilla Link	999
Resolution	FIXED
Resolved on	Feb 22, 2010 12:41
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor

Extended Description

While building llvm-gcc4, I get:

X86FloatingPoint.cpp:434: void
::FPS::popStackAfter(llvm::ilist_iteratorllvm::MachineInstr&):
Assertion `StackTop > 0 && "Cannot pop empty stack!"' failed.

[llvmbot]

full command and output:

./xgcc -B./ -B/proj/llvm/cfe/install-1/i686-pc-linux-gnu/bin/ -isystem
/proj/llvm/cfe/install-1/i686-pc-linux-gnu/include -isystem
/proj/llvm/cfe/install-1/i686-pc-linux-gnu/sys-include
-L/proj/llvm/cfe/build-1/gcc/../ld -O2 -DIN_GCC -W -Wall -Wwrite-strings
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -isystem
./include -fPIC -g -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -I. -I.
-I../../src-1/gcc -I../../src-1/gcc/. -I../../src-1/gcc/../include
-I../../src-1/gcc/../libcpp/include -I/proj/llvm/llvm-1/include
-I/proj/llvm/llvm-1/include -DL_fixunsdfdi -fvisibility=hidden -DHIDE_EXPORTS -c
../../src-1/gcc/libgcc2.c -o libgcc/./_fixunsdfdi.o
cc1: X86FloatingPoint.cpp:434: void
::FPS::popStackAfter(llvm::ilist_iteratorllvm::MachineInstr&):
Assertion StackTop > 0 && "Cannot pop empty stack!"' failed. ../../src-1/gcc/libgcc2.c:1503: internal compiler error: Aborted Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://llvm.org/bugs> for instructions. make[1]: *** [libgcc/./_fixunsdfsi.o] Error 1 make[1]: *** Waiting for unfinished jobs.... cc1: X86FloatingPoint.cpp:434: void <unnamed>::FPS::popStackAfter(llvm::ilist_iterator<llvm::MachineInstr>&): Assertion StackTop > 0 && "Cannot pop empty stack!"' failed.
../../src-1/gcc/libgcc2.c:1525: internal compiler error: Aborted

[llvmbot]

Please provide me with a reproducible test case. Preferrably a bytecode file.

[lattner]

since this is an fpstack issue, it will likely fall on my plate. Please provide a bc file. In the mean time, you
can work around this by configuring the first llvm-gcc with "--with-arch=pentium-m --with-
tune=prescott" which will tell it that use of SSE for FP is ok.

-Chris

[llvmbot]

Fixed.

[llvmbot]

Patches that fix this:

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061106/039813.html

[lattner]

to be clear, this regression wasn't in the 1.9 release.