http://llvm.org/bugs/show_bug.cgi?id=9939
Summary: Loop strength reduction breaks this test
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=6604)
--> (http://llvm.org/bugs/attachment.cgi?id=6604)
testcase
Loop strength reduction is breaking firefox's test_jsctypes.js.
I reduced the problem to the attached testcase, but haven't been able to find
the bug itself yet. Looks like what it gets wrong is the compensation added
when the loop condition is converted from
cmpq %r9, %rdx
jne .LBB0_4
to
addq $-2, %rcx
jne .LBB0_4
I checked that building with " -Xclang -mllvm -Xclang -disable-lsr" added
causes the original test to pass.
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