https://bugs.llvm.org/show_bug.cgi?id=34697
Bug ID: 34697
Summary: Very undeterministic handling of file: different
output .s file every time
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 19184
--> https://bugs.llvm.org/attachment.cgi?id=19184&action=edit
original test case
I noticed that one particular file in SPEC-2006 keeps changing in the .s output
every time as I recompile it (it was the only file to do so).
I tried to track this down with bugpoint and a bisect, but with no luck. The
reduced test case changes output every now and then, but the original input
changes every time. It looks like it could be related to regalloc as
spill/reload instructions show up in the diffs.
bin/clang -cc1 -triple s390x-ibm-linux -S -target-cpu z13 -O3 -vectorize-loops
-vectorize-slp -o out0 -x ir ./Utilities_newsort.bc
bin/clang -cc1 -triple s390x-ibm-linux -S -target-cpu z13 -O3 -vectorize-loops
-vectorize-slp -o out1 -x ir ./Utilities_newsort.bc
diff out0 out1 | less
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