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cmd/compile: use bounded shift information on ppc64x

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Makes use of bounded shift information to generate
more efficient shift instructions.

Updates #25167 for ppc64x

Change-Id: I7fc8d49a3fb3e0f273cc51bc767470b239cbdca7
Reviewed-on: https://go-review.googlesource.com/135380
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
This commit is contained in:
Lynn Boger 2018-09-13 14:45:23 -04:00
parent c381ba8657
commit d45f24c084
2 changed files with 798 additions and 4 deletions
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14
src/cmd/compile/internal/ssa/gen/PPC64.rules
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@ -168,6 +168,20 @@
(Rsh8x32 x (MOVDconst [c])) && uint32(c) < 8 -> (SRAWconst (SignExt8to32 x) [c])
(Rsh8Ux32 x (MOVDconst [c])) && uint32(c) < 8 -> (SRWconst (ZeroExt8to32 x) [c])
// 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)
(Lsh16x(64|32|16|8) x y) && shiftIsBounded(v) -> (SLW x y)
(Lsh8x(64|32|16|8) x y) && shiftIsBounded(v) -> (SLW x y)
(Rsh64Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRD x y)
(Rsh32Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRW x y)
(Rsh16Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRW (MOVHZreg x) y)
(Rsh8Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRW (MOVBZreg x) y)
(Rsh64x(64|32|16|8) x y) && shiftIsBounded(v) -> (SRAD x y)
(Rsh32x(64|32|16|8) x y) && shiftIsBounded(v) -> (SRAW x y)
(Rsh16x(64|32|16|8) x y) && shiftIsBounded(v) -> (SRAW (MOVHreg x) y)
(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

788
src/cmd/compile/internal/ssa/rewritePPC64.go
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