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cmd/compile: remove some lines from PPC64.rules

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In CL 429035 Keith suggested removing some
rules that were covered by generic rules. This
follows up on that comment.

Change-Id: I57b6c9ae0cd85f33a0eb2fef8356575d3d7820fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/430417
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Lynn Boger 2022-09-12 17:07:00 -05:00
parent 53773a5d08
commit 6e1b769377
2 changed files with 1 additions and 1183 deletions
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34
src/cmd/compile/internal/ssa/gen/PPC64.rules
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@ -155,12 +155,6 @@
// The following reduction shows up frequently too. e.g b[(x>>14)&0xFF]
(CLRLSLDI [c] i:(RLWINM [s] x)) && mergePPC64ClrlsldiRlwinm(c,s) != 0 => (RLWINM [mergePPC64ClrlsldiRlwinm(c,s)] x)
// large constant shifts
((Lsh64|Rsh64U)x64 _ (MOVDconst [c])) && uint64(c) >= 64 => (MOVDconst [0])
((Lsh32|Rsh32U)x64 _ (MOVDconst [c])) && uint64(c) >= 32 => (MOVDconst [0])
((Lsh16|Rsh16U)x64 _ (MOVDconst [c])) && uint64(c) >= 16 => (MOVDconst [0])
((Lsh8|Rsh8U)x64 _ (MOVDconst [c])) && uint64(c) >= 8 => (MOVDconst [0])
// large constant signed right shift, we leave the sign bit
(Rsh64x64 x (MOVDconst [c])) && uint64(c) >= 64 => (SRADconst x [63])
(Rsh32x64 x (MOVDconst [c])) && uint64(c) >= 32 => (SRAWconst x [63])
@ -175,13 +169,6 @@
((Rsh8|Rsh8U)x64 x (MOVDconst [c])) && uint64(c) < 8 => (SR(AW|W)const ((Sign|Zero)Ext8to32 x) [c])
(Lsh8x64 x (MOVDconst [c])) && uint64(c) < 8 => (SLWconst x [c])
((Lsh64|Rsh64|Rsh64U)x32 x (MOVDconst [c])) && uint32(c) < 64 => (S(L|RA|R)Dconst x [c&63])
((Lsh32|Rsh32|Rsh32U)x32 x (MOVDconst [c])) && uint32(c) < 32 => (S(L|RA|R)Wconst x [c&31])
(Lsh16x32 x (MOVDconst [c])) && uint32(c) < 16 => (SLWconst x [c&15])
(Rsh(16|16U)x32 x (MOVDconst [c])) && uint32(c) < 16 => (S(RA|R)Wconst ((Sign|Zero)Ext16to32 x) [c&15])
(Lsh8x32 x (MOVDconst [c])) && uint32(c) < 8 => (SLWconst x [c&7])
(Rsh(8|8U)x32 x (MOVDconst [c])) && uint32(c) < 8 => (S(RA|R)Wconst ((Sign|Zero)Ext8to32 x) [c&7])
// Lower bounded shifts first. No need to check shift value.
(Lsh64x(64|32|16|8) x y) && shiftIsBounded(v) => (SLD x y)
(Lsh32x(64|32|16|8) x y) && shiftIsBounded(v) => (SLW x y)
@ -197,27 +184,8 @@
(Rsh8x(64|32|16|8) x y) && shiftIsBounded(v) => (SRAW (MOVBreg x) y)
// non-constant rotates
// These are subexpressions found in statements that can become rotates
// In these cases the shift count is known to be < 64 so the more complicated expressions
// with Mask & Carry is not needed
((Lsh64|Rsh64U|Rsh64)x64 x (AND y (MOVDconst [63]))) => (S(L|R|RA)D x (Select0 <typ.Int64> (ANDCCconst [63] y)))
(Lsh64x64 x (Select0 (ANDCCconst <typ.Int64> [63] y))) => (SLD x (Select0 <typ.Int64> (ANDCCconst [63] y)))
((Rsh64U|Rsh64)x64 x (Select0 (ANDCCconst <typ.UInt> [63] y))) => (S(R|RA)D x (Select0 <typ.UInt> (ANDCCconst [63] y)))
((Rsh64U|Rsh64)x64 x (SUB <typ.UInt> (MOVDconst [64]) (Select0 (ANDCCconst <typ.UInt> [63] y)))) => (SR(D|AD) x (SUB <typ.UInt> (MOVDconst [64]) (Select0 <typ.UInt> (ANDCCconst [63] y))))
((Rsh64U|Rsh64)x64 x (SUBFCconst <typ.UInt> [64] (Select0 (ANDCCconst <typ.UInt> [63] y)))) => (SR(D|AD) x (SUBFCconst <typ.UInt> [64] (Select0 <typ.UInt> (ANDCCconst [63] y))))
((Rsh64U|Rsh64)x64 x (SUB <typ.UInt> (MOVDconst [64]) (AND <typ.UInt> y (MOVDconst [63])))) => (SR(D|AD) x (SUB <typ.UInt> (MOVDconst [64]) (Select0 <typ.UInt> (ANDCCconst [63] y))))
((Rsh64U|Rsh64)x64 x (SUBFCconst <typ.UInt> [64] (AND <typ.UInt> y (MOVDconst [63])))) => (SR(D|AD) x (SUBFCconst <typ.UInt> [64] (Select0 <typ.UInt> (ANDCCconst [63] y))))
// If shift > 64 then use -1 as shift count to shift all bits.
((Lsh64|Rsh64|Rsh64U)x64 x y) => (S(L|RA|R)D x (ISEL [0] y (MOVDconst [-1]) (CMPU y (MOVDconst [64]))))
((Lsh32|Rsh32|Rsh32U)x64 x (AND y (MOVDconst [31]))) => (S(L|RA|R)W x (Select0 <typ.Int32> (ANDCCconst [31] y)))
(Lsh32x64 x (Select0 <typ.Int32> (ANDCCconst [31] y))) => (SLW x (Select0 <typ.Int32> (ANDCCconst [31] y)))
((Rsh32|Rsh32U)x64 x (Select0 (ANDCCconst <typ.UInt> [31] y))) => (S(RA|R)W x (Select0 <typ.UInt> (ANDCCconst [31] y)))
(Rsh(32|32U)x64 x (SUB <typ.UInt> (MOVDconst [32]) (Select0 (ANDCCconst <typ.UInt> [31] y)))) => (SR(AW|W) x (SUB <typ.UInt> (MOVDconst [32]) (Select0 <typ.UInt> (ANDCCconst [31] y))))
(Rsh(32|32U)x64 x (SUBFCconst <typ.UInt> [32] (Select0 (ANDCCconst <typ.UInt> [31] y)))) => (SR(AW|W) x (SUBFCconst <typ.UInt> [32] (Select0 <typ.UInt> (ANDCCconst [31] y))))
(Rsh(32|32U)x64 x (SUB <typ.UInt> (MOVDconst [32]) (AND <typ.UInt> y (MOVDconst [31])))) => (SR(AW|W) x (SUB <typ.UInt> (MOVDconst [32]) (Select0 <typ.UInt> (ANDCCconst [31] y))))
(Rsh(32|32U)x64 x (SUBFCconst <typ.UInt> [32] (AND <typ.UInt> y (MOVDconst [31])))) => (SR(AW|W) x (SUBFCconst <typ.UInt> [32] (Select0 <typ.UInt> (ANDCCconst [31] y))))
((Rsh32|Rsh32U|Lsh32)x64 x y) => (S(RA|R|L)W x (ISEL [0] y (MOVDconst [-1]) (CMPU y (MOVDconst [32]))))
(Rsh(16|16U)x64 x y) => (SR(AW|W) ((Sign|Zero)Ext16to32 x) (ISEL [0] y (MOVDconst [-1]) (CMPU y (MOVDconst [16]))))

1150
src/cmd/compile/internal/ssa/rewritePPC64.go
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