http://llvm.org/bugs/show_bug.cgi?id=5375
Summary: Too many redundant neon / vfp reg-reg moves are
generated
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=3748)
--> (http://llvm.org/bugs/attachment.cgi?id=3748)
Small testcase
We are generating too much extra reg-reg moves mostly due to weak subreg
lowering - it's not able to fold the stuff.
Consider the attached testcase (I think it's the smalles one possible). We have
the following code generated:
fldd d0, .LCPI1_0
fldd d2, .LCPI1_1
vmov d1, d2
bl baz
d2 is killed at vmov, thus vmov should be folded into fldd.
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