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[AArch64] Check the expansion of BITREVERSE in regression test

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Something I missed from Hal's review, rightly pointed out by Ben Kramer - we should make sure the expansion is properly checked as it can be easy for bugs to creep in.

I've checked the scalar i8 expansion here and the vector i8 expansion in a previous commit.

llvm-svn: 253024
This commit is contained in:
James Molloy 2015-11-13 10:05:31 +00:00
parent bbd6827ba1
commit a20b34c6bd
1 changed files with 21 additions and 2 deletions
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23
test/CodeGen/AArch64/bitreverse.ll
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@ -14,10 +14,29 @@ define <2 x i16> @f(<2 x i16> %a) {
declare i8 @llvm.bitreverse.i8(i8) readnone
; Unfortunately some of the shift-and-inserts become BFIs, and some do not :(
define i8 @g(i8 %a) {
; CHECK-LABEL: g:
; CHECK: lsl
; CHECK: and
; CHECK-DAG: lsr [[S5:w.*]], w0, #5
; CHECK-DAG: lsr [[S4:w.*]], w0, #4
; CHECK-DAG: lsr [[S3:w.*]], w0, #3
; CHECK-DAG: lsr [[S2:w.*]], w0, #2
; CHECK-DAG: lsl [[L1:w.*]], w0, #29
; CHECK-DAG: lsl [[L2:w.*]], w0, #19
; CHECK-DAG: lsl [[L3:w.*]], w0, #17
; CHECK-DAG: and [[T1:w.*]], [[L1]], #0x40000000
; CHECK-DAG: bfi [[T1]], w0, #31, #1
; CHECK-DAG: bfi [[T1]], [[S2]], #29, #1
; CHECK-DAG: bfi [[T1]], [[S3]], #28, #1
; CHECK-DAG: bfi [[T1]], [[S4]], #27, #1
; CHECK-DAG: bfi [[T1]], [[S5]], #26, #1
; CHECK-DAG: and [[T2:w.*]], [[L2]], #0x2000000
; CHECK-DAG: and [[T3:w.*]], [[L3]], #0x1000000
; CHECK-DAG: orr [[T4:w.*]], [[T1]], [[T2]]
; CHECK-DAG: orr [[T5:w.*]], [[T4]], [[T3]]
; CHECK: lsr w0, [[T5]], #24
%b = call i8 @llvm.bitreverse.i8(i8 %a)
ret i8 %b
}