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| author | Hal Finkel <hfinkel@anl.gov> | 2013-04-01 15:58:15 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-04-01 15:58:15 +0000 |
| commit | 1fce88313e4d46fdd432b68f7c54fde972c0b526 (patch) | |
| tree | 37667e799816e865c01a29de851f0b60f8d7f253 | |
| parent | 953783e00c9934bc41077108fffeb1e2a17b00df (diff) | |
| download | llvm-1fce88313e4d46fdd432b68f7c54fde972c0b526.tar.gz llvm-1fce88313e4d46fdd432b68f7c54fde972c0b526.tar.bz2 llvm-1fce88313e4d46fdd432b68f7c54fde972c0b526.tar.xz | |
Add the PPC popcntw instruction
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
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.cpp | 2 | ||||
| -rw-r--r-- | lib/Target/PowerPC/PPCInstr64Bit.td | 7 | ||||
| -rw-r--r-- | test/CodeGen/PowerPC/popcnt.ll | 11 |
3 files changed, 13 insertions, 7 deletions
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp index a0e8e13537..89b42af72e 100644 --- a/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/lib/Target/PowerPC/PPCISelLowering.cpp @@ -190,7 +190,7 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM) setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand); if (Subtarget->hasPOPCNTD()) { - setOperationAction(ISD::CTPOP, MVT::i32 , Promote); + setOperationAction(ISD::CTPOP, MVT::i32 , Legal); setOperationAction(ISD::CTPOP, MVT::i64 , Legal); } else { setOperationAction(ISD::CTPOP, MVT::i32 , Expand); diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td index 6cc2260de5..61702cf916 100644 --- a/lib/Target/PowerPC/PPCInstr64Bit.td +++ b/lib/Target/PowerPC/PPCInstr64Bit.td @@ -468,6 +468,13 @@ def POPCNTD : XForm_11<31, 506, (outs G8RC:$rA), (ins G8RC:$rS), "popcntd $rA, $rS", IntGeneral, [(set i64:$rA, (ctpop i64:$rS))]>; +// popcntw also does a population count on the high 32 bits (storing the +// results in the high 32-bits of the output). We'll ignore that here (which is +// safe because we never separately use the high part of the 64-bit registers). +def POPCNTW : XForm_11<31, 378, (outs GPRC:$rA), (ins GPRC:$rS), + "popcntw $rA, $rS", IntGeneral, + [(set i32:$rA, (ctpop i32:$rS))]>; + def DIVD : XOForm_1<31, 489, 0, (outs G8RC:$rT), (ins G8RC:$rA, G8RC:$rB), "divd $rT, $rA, $rB", IntDivD, [(set i64:$rT, (sdiv i64:$rA, i64:$rB))]>, isPPC64, diff --git a/test/CodeGen/PowerPC/popcnt.ll b/test/CodeGen/PowerPC/popcnt.ll index 363f7059e4..b304d72aed 100644 --- a/test/CodeGen/PowerPC/popcnt.ll +++ b/test/CodeGen/PowerPC/popcnt.ll @@ -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 } |