http://llvm.org/bugs/show_bug.cgi?id=22852
Bug ID: 22852
Summary: Redundant mov generated for return value
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following code:
unsigned long
baz (unsigned long a, unsigned long b)
{
return (a & 0xffffffff) | (b & 0xffffffff00000000);
}
Produces:
baz: // @baz
// BB#0: // %entry
bfxil x1, x0, #0, #32
mov x0, x1
ret
The mov here is redundant; we can just emit "bfxil x0, x0, #0, #32".
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