https://llvm.org/bugs/show_bug.cgi?id=26084
Bug ID: 26084
Summary: [AArch64] Missed CCMP opportunity
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: mcros...@codeaurora.org
CC: bma...@codeaurora.org, llvm-bugs@lists.llvm.org
Classification: Unclassified
Test case:
int test(int A, int B) {
return !(A > 0 && B > 0);
}
When targeting AArch64 at -O3 we currently generate the following assembly:
test:
cmp w0, #1
cset w8, lt
cmp w1, #1
cset w9, lt
orr w0, w8, w9
ret
We should be able to generate something like this:
test:
cmp w0, wzr
ccmp w1, wzr, 4, gt
cset w0, le
ret
which removes 1 cset and 1 orr.
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