https://llvm.org/bugs/show_bug.cgi?id=28965
Bug ID: 28965
Summary: [AArch64] missed opportunity to use conditional select
invert (csinv)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: spatel+l...@rotateright.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Forking this off of bug 28964:
define i32 @goo(i32 %x) {
%cmp = icmp eq i32 %x, 1
%sel = select i1 %cmp, i32 1, i32 -1
%call = tail call i32 @bar(i32 %sel)
ret i32 %call
}
declare i32 @bar(i32)
$ ./llc -o - selcall.ll -mtriple=aarch64
...
cmp w0, #1 // =1
orr w8, wzr, #0x1
cneg w0, w8, ne
b bar
gcc 4.8 on godbolt ( https://godbolt.org/g/BW5RJu ) shows:
foo(int):
cmp w0, 1
csinv w0, w0, wzr, eq
b bar(int)
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