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cmd/compile: use more ORs in generic.rules

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No changes in the actual generated compiler code.

Change-Id: I206a7bf7b60f70a73640119fc92974f79ed95a6b
Reviewed-on: https://go-review.googlesource.com/102416
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
This commit is contained in:
Alberto Donizetti 2018-03-24 12:08:00 +01:00
parent 49325dc1d2
commit fdee46ee70
1 changed files with 12 additions and 36 deletions
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48
src/cmd/compile/internal/ssa/gen/generic.rules
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@ -282,17 +282,11 @@
(Mul32 (Const32 <t> [c]) (Add32 <t> (Const32 <t> [d]) x)) ->
(Add32 (Const32 <t> [int64(int32(c*d))]) (Mul32 <t> (Const32 <t> [c]) x))
// Rewrite x*y + x*z to x*(y+z)
(Add64 <t> (Mul64 x y) (Mul64 x z)) -> (Mul64 x (Add64 <t> y z))
(Add32 <t> (Mul32 x y) (Mul32 x z)) -> (Mul32 x (Add32 <t> y z))
(Add16 <t> (Mul16 x y) (Mul16 x z)) -> (Mul16 x (Add16 <t> y z))
(Add8 <t> (Mul8 x y) (Mul8 x z)) -> (Mul8 x (Add8 <t> y z))
// Rewrite x*y - x*z to x*(y-z)
(Sub64 <t> (Mul64 x y) (Mul64 x z)) -> (Mul64 x (Sub64 <t> y z))
(Sub32 <t> (Mul32 x y) (Mul32 x z)) -> (Mul32 x (Sub32 <t> y z))
(Sub16 <t> (Mul16 x y) (Mul16 x z)) -> (Mul16 x (Sub16 <t> y z))
(Sub8 <t> (Mul8 x y) (Mul8 x z)) -> (Mul8 x (Sub8 <t> y z))
// Rewrite x*y ± x*z to x*(y±z)
(Add(64|32|16|8) <t> (Mul(64|32|16|8) x y) (Mul(64|32|16|8) x z))
-> (Mul(64|32|16|8) x (Add(64|32|16|8) <t> y z))
(Sub(64|32|16|8) <t> (Mul(64|32|16|8) x y) (Mul(64|32|16|8) x z))
-> (Mul(64|32|16|8) x (Sub(64|32|16|8) <t> y z))
// rewrite shifts of 8/16/32 bit consts into 64 bit consts to reduce
// the number of the other rewrite rules for const shifts
@ -337,20 +331,11 @@
(Rsh8Ux8 <t> x (Const8 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint8(c))]))
// shifts by zero
(Lsh64x64 x (Const64 [0])) -> x
(Rsh64x64 x (Const64 [0])) -> x
(Rsh64Ux64 x (Const64 [0])) -> x
(Lsh32x64 x (Const64 [0])) -> x
(Rsh32x64 x (Const64 [0])) -> x
(Rsh32Ux64 x (Const64 [0])) -> x
(Lsh16x64 x (Const64 [0])) -> x
(Rsh16x64 x (Const64 [0])) -> x
(Rsh16Ux64 x (Const64 [0])) -> x
(Lsh8x64 x (Const64 [0])) -> x
(Rsh8x64 x (Const64 [0])) -> x
(Rsh8Ux64 x (Const64 [0])) -> x
(Lsh(64|32|16|8)x64 x (Const64 [0])) -> x
(Rsh(64|32|16|8)x64 x (Const64 [0])) -> x
(Rsh(64|32|16|8)Ux64 x (Const64 [0])) -> x
// zero shifted.
// zero shifted
(Lsh64x(64|32|16|8) (Const64 [0]) _) -> (Const64 [0])
(Rsh64x(64|32|16|8) (Const64 [0]) _) -> (Const64 [0])
(Rsh64Ux(64|32|16|8) (Const64 [0]) _) -> (Const64 [0])
@ -481,19 +466,10 @@
(Neg(64|32|16|8) (Sub(64|32|16|8) x y)) -> (Sub(64|32|16|8) y x)
(Add8 (Const8 [1]) (Com8 x)) -> (Neg8 x)
(Add16 (Const16 [1]) (Com16 x)) -> (Neg16 x)
(Add32 (Const32 [1]) (Com32 x)) -> (Neg32 x)
(Add64 (Const64 [1]) (Com64 x)) -> (Neg64 x)
(Add(64|32|16|8) (Const(64|32|16|8) [1]) (Com(64|32|16|8) x)) -> (Neg(64|32|16|8) x)
(And64 x (And64 x y)) -> (And64 x y)
(And32 x (And32 x y)) -> (And32 x y)
(And16 x (And16 x y)) -> (And16 x y)
(And8 x (And8 x y)) -> (And8 x y)
(Or64 x (Or64 x y)) -> (Or64 x y)
(Or32 x (Or32 x y)) -> (Or32 x y)
(Or16 x (Or16 x y)) -> (Or16 x y)
(Or8 x (Or8 x y)) -> (Or8 x y)
(And(64|32|16|8) x (And(64|32|16|8) x y)) -> (And(64|32|16|8) x y)
(Or(64|32|16|8) x (Or(64|32|16|8) x y)) -> (Or(64|32|16|8) x y)
(Xor(64|32|16|8) x (Xor(64|32|16|8) x y)) -> y
// Ands clear bits. Ors set bits.