https://bugs.llvm.org/show_bug.cgi?id=52141
Bug ID: 52141
Summary: [AArch64] Generate stp for complex repeating
constansts
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Keywords: beginner
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected],
[email protected], [email protected],
[email protected]
For complex repeating constants like:
void
foo (unsigned long long *a)
{
a[0] = 0x0140c0da0140c0daULL;
}
aarch64 clang generates
foo(unsigned long long*): // @foo(unsigned long
long*)
mov x8, #49370
movk x8, #320, lsl #16
movk x8, #49370, lsl #32
movk x8, #320, lsl #48
str x8, [x0]
ret
but for constants where the top half is the same as the bottom half we can
construct just one half and use a store pair to duplicate it:
foo(unsigned long long*):
mov w1, 49370
movk w1, 0x140, lsl 16
stp w1, w1, [x0]
ret
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