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Add the PPC popcntw instruction

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The popcntw instruction is available whenever the popcntd instruction is
available, and performs a separate popcnt on the lower and upper 32-bits.
Ignoring the high-order count, this can be used for the 32-bit input case
(saving on the explicit zero extension otherwise required to use popcntd).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178470 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-04-01 15:58:15 +00:00
parent 953783e00c
commit 1fce88313e
3 changed files with 13 additions and 7 deletions
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11
test/CodeGen/PowerPC/popcnt.ll
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@@ -4,8 +4,8 @@ define i8 @cnt8(i8 %x) nounwind readnone {
%cnt = tail call i8 @llvm.ctpop.i8(i8 %x)
ret i8 %cnt
; CHECK: @cnt8
; CHECK: rldicl
; CHECK: popcntd
; CHECK: rlwinm
; CHECK: popcntw
; CHECK: blr
}
@@ -13,8 +13,8 @@ define i16 @cnt16(i16 %x) nounwind readnone {
%cnt = tail call i16 @llvm.ctpop.i16(i16 %x)
ret i16 %cnt
; CHECK: @cnt16
; CHECK: rldicl
; CHECK: popcntd
; CHECK: rlwinm
; CHECK: popcntw
; CHECK: blr
}
@@ -22,8 +22,7 @@ define i32 @cnt32(i32 %x) nounwind readnone {
%cnt = tail call i32 @llvm.ctpop.i32(i32 %x)
ret i32 %cnt
; CHECK: @cnt32
; CHECK: rldicl
; CHECK: popcntd
; CHECK: popcntw
; CHECK: blr
}