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cmd/compile: Improve const shifts in PPC64.rules

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This change updates PPC64.rules to recognize constant shift
counts and generate more efficient code sequences in those cases.

Fixes #17336

Change-Id: I8a7b812408d7a68388df41e42bad045dd214be17
Reviewed-on: https://go-review.googlesource.com/30310
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Lynn Boger 2016-10-04 14:14:48 -05:00 committed by David Chase
parent f54c0db859
commit 6dd38ebae1
2 changed files with 1179 additions and 10 deletions
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89
src/cmd/compile/internal/ssa/gen/PPC64.rules
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@ -75,6 +75,85 @@
(Sqrt x) -> (FSQRT x)
// Lowering constants
(Const8 [val]) -> (MOVDconst [val])
(Const16 [val]) -> (MOVDconst [val])
(Const32 [val]) -> (MOVDconst [val])
(Const64 [val]) -> (MOVDconst [val])
(Const32F [val]) -> (FMOVSconst [val])
(Const64F [val]) -> (FMOVDconst [val])
(ConstNil) -> (MOVDconst [0])
(ConstBool [b]) -> (MOVDconst [b])
(Lsh64x64 x (Const64 [c])) && uint64(c) < 64 -> (SLDconst x [c])
(Rsh64x64 x (Const64 [c])) && uint64(c) < 64 -> (SRADconst x [c])
(Rsh64Ux64 x (Const64 [c])) && uint64(c) < 64 -> (SRDconst x [c])
(Lsh32x64 x (Const64 [c])) && uint64(c) < 32 -> (SLWconst x [c])
(Rsh32x64 x (Const64 [c])) && uint64(c) < 32 -> (SRAWconst x [c])
(Rsh32Ux64 x (Const64 [c])) && uint64(c) < 32 -> (SRWconst x [c])
(Lsh16x64 x (Const64 [c])) && uint64(c) < 16 -> (SLWconst x [c])
(Rsh16x64 x (Const64 [c])) && uint64(c) < 16 -> (SRAWconst (SignExt16to32 x) [c])
(Rsh16Ux64 x (Const64 [c])) && uint64(c) < 16 -> (SRWconst (ZeroExt16to32 x) [c])
(Lsh8x64 x (Const64 [c])) && uint64(c) < 8 -> (SLWconst x [c])
(Rsh8x64 x (Const64 [c])) && uint64(c) < 8 -> (SRAWconst (SignExt8to32 x) [c])
(Rsh8Ux64 x (Const64 [c])) && uint64(c) < 8 -> (SRWconst (ZeroExt8to32 x) [c])
(Lsh64x32 x (Const64 [c])) && uint32(c) < 64 -> (SLDconst x [c])
(Rsh64x32 x (Const64 [c])) && uint32(c) < 64 -> (SRADconst x [c])
(Rsh64Ux32 x (Const64 [c])) && uint32(c) < 64 -> (SRDconst x [c])
(Lsh32x32 x (Const64 [c])) && uint32(c) < 32 -> (SLWconst x [c])
(Rsh32x32 x (Const64 [c])) && uint32(c) < 32 -> (SRAWconst x [c])
(Rsh32Ux32 x (Const64 [c])) && uint32(c) < 32 -> (SRWconst x [c])
(Lsh16x32 x (Const64 [c])) && uint32(c) < 16 -> (SLWconst x [c])
(Rsh16x32 x (Const64 [c])) && uint32(c) < 16 -> (SRAWconst (SignExt16to32 x) [c])
(Rsh16Ux32 x (Const64 [c])) && uint32(c) < 16 -> (SRWconst (ZeroExt16to32 x) [c])
(Lsh8x32 x (Const64 [c])) && uint32(c) < 8 -> (SLWconst x [c])
(Rsh8x32 x (Const64 [c])) && uint32(c) < 8 -> (SRAWconst (SignExt8to32 x) [c])
(Rsh8Ux32 x (Const64 [c])) && uint32(c) < 8 -> (SRWconst (ZeroExt8to32 x) [c])
// large constant shifts
(Lsh64x64 _ (Const64 [c])) && uint64(c) >= 64 -> (MOVDconst [0])
(Rsh64Ux64 _ (Const64 [c])) && uint64(c) >= 64 -> (MOVDconst [0])
(Lsh32x64 _ (Const64 [c])) && uint64(c) >= 32 -> (MOVDconst [0])
(Rsh32Ux64 _ (Const64 [c])) && uint64(c) >= 32 -> (MOVDconst [0])
(Lsh16x64 _ (Const64 [c])) && uint64(c) >= 16 -> (MOVDconst [0])
(Rsh16Ux64 _ (Const64 [c])) && uint64(c) >= 16 -> (MOVDconst [0])
(Lsh8x64 _ (Const64 [c])) && uint64(c) >= 8 -> (MOVDconst [0])
(Rsh8Ux64 _ (Const64 [c])) && uint64(c) >= 8 -> (MOVDconst [0])
// large constant signed right shift, we leave the sign bit
(Rsh64x64 x (Const64 [c])) && uint64(c) >= 64 -> (SRADconst x [63])
(Rsh32x64 x (Const64 [c])) && uint64(c) >= 32 -> (SRAWconst x [63])
(Rsh16x64 x (Const64 [c])) && uint64(c) >= 16 -> (SRAWconst (SignExt16to32 x) [63])
(Rsh8x64 x (Const64 [c])) && uint64(c) >= 8 -> (SRAWconst (SignExt8to32 x) [63])
// constant shifts
(Lsh64x64 x (MOVDconst [c])) && uint64(c) < 64 -> (SLDconst x [c])
(Rsh64x64 x (MOVDconst [c])) && uint64(c) < 64 -> (SRADconst x [c])
(Rsh64Ux64 x (MOVDconst [c])) && uint64(c) < 64 -> (SRDconst x [c])
(Lsh32x64 x (MOVDconst [c])) && uint64(c) < 32 -> (SLWconst x [c])
(Rsh32x64 x (MOVDconst [c])) && uint64(c) < 32 -> (SRAWconst x [c])
(Rsh32Ux64 x (MOVDconst [c])) && uint64(c) < 32 -> (SRWconst x [c])
(Lsh16x64 x (MOVDconst [c])) && uint64(c) < 16 -> (SLWconst x [c])
(Rsh16x64 x (MOVDconst [c])) && uint64(c) < 16 -> (SRAWconst (SignExt16to32 x) [c])
(Rsh16Ux64 x (MOVDconst [c])) && uint64(c) < 16 -> (SRWconst (ZeroExt16to32 x) [c])
(Lsh8x64 x (MOVDconst [c])) && uint64(c) < 8 -> (SLWconst x [c])
(Rsh8x64 x (MOVDconst [c])) && uint64(c) < 8 -> (SRAWconst (SignExt8to32 x) [c])
(Rsh8Ux64 x (MOVDconst [c])) && uint64(c) < 8 -> (SRWconst (ZeroExt8to32 x) [c])
(Lsh64x32 x (MOVDconst [c])) && uint32(c) < 64 -> (SLDconst x [c])
(Rsh64x32 x (MOVDconst [c])) && uint32(c) < 64 -> (SRADconst x [c])
(Rsh64Ux32 x (MOVDconst [c])) && uint32(c) < 64 -> (SRDconst x [c])
(Lsh32x32 x (MOVDconst [c])) && uint32(c) < 32 -> (SLWconst x [c])
(Rsh32x32 x (MOVDconst [c])) && uint32(c) < 32 -> (SRAWconst x [c])
(Rsh32Ux32 x (MOVDconst [c])) && uint32(c) < 32 -> (SRWconst x [c])
(Lsh16x32 x (MOVDconst [c])) && uint32(c) < 16 -> (SLWconst x [c])
(Rsh16x32 x (MOVDconst [c])) && uint32(c) < 16 -> (SRAWconst (SignExt16to32 x) [c])
(Rsh16Ux32 x (MOVDconst [c])) && uint32(c) < 16 -> (SRWconst (ZeroExt16to32 x) [c])
(Lsh8x32 x (MOVDconst [c])) && uint32(c) < 8 -> (SLWconst x [c])
(Rsh8x32 x (MOVDconst [c])) && uint32(c) < 8 -> (SRAWconst (SignExt8to32 x) [c])
(Rsh8Ux32 x (MOVDconst [c])) && uint32(c) < 8 -> (SRWconst (ZeroExt8to32 x) [c])
(Rsh64x64 x y) -> (SRAD x (ORN y <config.fe.TypeInt64()> (MaskIfNotCarry (ADDconstForCarry [-64] y))))
(Rsh64Ux64 x y) -> (SRD x (ORN y <config.fe.TypeInt64()> (MaskIfNotCarry (ADDconstForCarry [-64] y))))
(Lsh64x64 x y) -> (SLD x (ORN y <config.fe.TypeInt64()> (MaskIfNotCarry (ADDconstForCarry [-64] y))))
@ -148,16 +227,6 @@
// (MaskIfNotCarry CarrySet) -> 0
// (MaskIfNotCarry CarrySet) -> -1
// Lowering constants
(Const8 [val]) -> (MOVDconst [val])
(Const16 [val]) -> (MOVDconst [val])
(Const32 [val]) -> (MOVDconst [val])
(Const64 [val]) -> (MOVDconst [val])
(Const32F [val]) -> (FMOVSconst [val])
(Const64F [val]) -> (FMOVDconst [val])
(ConstNil) -> (MOVDconst [0])
(ConstBool [b]) -> (MOVDconst [b])
(Addr {sym} base) -> (MOVDaddr {sym} base)
// (Addr {sym} base) -> (ADDconst {sym} base)
(OffPtr [off] ptr) -> (ADD (MOVDconst <config.Frontend().TypeInt64()> [off]) ptr)

1100
src/cmd/compile/internal/ssa/rewritePPC64.go
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