https://llvm.org/bugs/show_bug.cgi?id=24500
Bug ID: 24500
Summary: RA breaks invariance of generated code
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 14746
--> https://llvm.org/bugs/attachment.cgi?id=14746&action=edit
Source and includes. Also two .s files that show difference
LLVM produces different code from run to run for given source. After examining
dump file I found that differences begin after Virtual Register Rewriter pass.
And it seems like problem appears only with -mregparm=3.
Example I took is from Spec2000 suite. It's 177.mesa/copypix.c I couldn't
reduce test. I've tried to cut all but one function (where differences appear -
see .s files), but generated code seemed to be always the same.
Options I used:
clang -Os -c -m32 -mregparm=3 -march=pentium -Wno-return-type -Xclang
-msoft-float -mstack-alignment=4 copypix.c
But as I said only -mregparm=3 matters.
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