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fanzha02 2b50ab2aee cmd/compile: optimize single-precision floating point square root 
Add generic rule to rewrite the single-precision square root expression
with one single-precision instruction. The optimization will reduce two
times of precision converting between double-precision and single-precision.

On arm64 flatform.

previous:
  FCVTSD F0, F0
  FSQRTD F0, F0
  FCVTDS F0, F0

optimized:
  FSQRTS S0, S0

And this patch adds the test case to check the correctness.

This patch refers to CL 241877, contributed by Alice Xu
(dianhong.xu@arm.com)

Change-Id: I6de5d02281c693017ac4bd4c10963dd55989bd7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/276873
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2021-03-02 06:38:07 +00:00
..
big all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
bits all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
cmplx all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
rand all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
abs.go cmd/compile,math: improve code generation for math.Abs 2017-08-25 19:15:01 +00:00
acos_s390x.s math: use s390x mnemonics rather than binary encodings 2018-08-20 17:42:08 +00:00
acosh.go math: Remove redundant local variable Ln2 2020-09-19 09:09:52 +00:00
acosh_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
all_test.go cmd/compile: optimize single-precision floating point square root 2021-03-02 06:38:07 +00:00
arith_s390x.go math: simplify hasVX checking on s390x 2020-04-27 20:06:57 +00:00
arith_s390x_test.go math: use SIMD to accelerate additional scalar math functions on s390x 2017-05-08 19:52:30 +00:00
asin.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
asin_s390x.s math: use s390x mnemonics rather than binary encodings 2018-08-20 17:42:08 +00:00
asinh.go math: use SIMD to accelerate additional scalar math functions on s390x 2017-05-08 19:52:30 +00:00
asinh_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
atan.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
atan2.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
atan2_s390x.s math: correct Atan2(±y,+∞) = ±0 on s390x 2020-03-25 04:06:34 +00:00
atan_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
atanh.go math: use SIMD to accelerate additional scalar math functions on s390x 2017-05-08 19:52:30 +00:00
atanh_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
bits.go math: add RoundToEven function 2017-10-24 22:33:09 +00:00
cbrt.go math: use SIMD to accelerate additional scalar math functions on s390x 2017-05-08 19:52:30 +00:00
cbrt_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
const.go math: change oeis.org urls to https 2017-08-08 08:56:40 +00:00
copysign.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
cosh_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
dim.go math: remove asm version of Dim 2017-11-30 21:00:33 +00:00
dim_amd64.s math: remove asm version of Dim 2017-11-30 21:00:33 +00:00
dim_arm64.s math: remove asm version of Dim 2017-11-30 21:00:33 +00:00
dim_riscv64.s math: implement Min/Max in riscv64 assembly 2020-05-04 17:29:13 +00:00
dim_s390x.s math: optimize dim and remove s390x assembly implementation 2017-10-30 19:05:51 +00:00
erf.go math: use SIMD to accelerate additional scalar math functions on s390x 2017-05-08 19:52:30 +00:00
erf_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
erfc_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
erfinv.go all: update comment URLs from HTTP to HTTPS, where possible 2018-06-01 21:52:00 +00:00
example_test.go math: add function examples. 2020-05-02 20:22:19 +00:00
exp.go math: fix inaccurate result of Exp(1) 2017-08-17 09:01:27 +00:00
exp_amd64.s math: fix dead link to springerlink (now link.springer) 2020-05-29 14:33:50 +00:00
exp_arm64.s math: optimize Exp and Exp2 on arm64 2018-03-27 19:55:02 +00:00
exp_asm.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
exp_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
expm1.go all: unindent some big chunks of code 2017-08-18 06:59:48 +00:00
expm1_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
export_s390x_test.go math: use SIMD to accelerate additional scalar math functions on s390x 2017-05-08 19:52:30 +00:00
export_test.go math: use constant rather than variable for exported test threshold 2018-12-13 06:33:18 +00:00
floor.go math: add RoundToEven function 2017-10-24 22:33:09 +00:00
floor_386.s all: make copyright headers consistent with one space after period 2016-03-01 23:34:33 +00:00
floor_amd64.s cmd/compile: intrinsify math.{Trunc/Ceil/Floor} on amd64 2017-10-31 19:30:54 +00:00
floor_arm64.s math: add some assembly implementations on ARM64 2016-09-27 23:52:12 +00:00
floor_ppc64x.s math, cmd/internal/obj/ppc64: improve floor, ceil, trunc with asm 2016-09-23 13:03:08 +00:00
floor_s390x.s math: optimize Ceil, Floor and Trunc on s390x 2016-08-26 17:27:13 +00:00
floor_wasm.s math, math/big: add wasm architecture 2018-05-08 13:29:22 +00:00
fma.go math, cmd/compile: rename Fma to FMA 2019-11-07 14:51:06 +00:00
frexp.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
gamma.go math: speed up Gamma(+Inf) 2016-10-18 22:12:03 +00:00
huge_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
hypot.go math: use Abs rather than if x < 0 { x = -x } 2018-02-13 20:12:23 +00:00
hypot_386.s all: make copyright headers consistent with one space after period 2016-03-01 23:34:33 +00:00
hypot_amd64.s all: make copyright headers consistent with one space after period 2016-03-01 23:34:33 +00:00
j0.go all: s/cancelation/cancellation/ 2019-04-16 20:27:15 +00:00
j1.go all: s/cancelation/cancellation/ 2019-04-16 20:27:15 +00:00
jn.go math: use Sincos instead of Sin and Cos in Jn and Yn 2019-03-25 22:41:37 +00:00
ldexp.go math: fix Ldexp when result is below ldexp(2, -1075) 2018-03-29 23:14:13 +00:00
lgamma.go go/printer, gofmt: tuned table alignment for better results 2018-04-04 13:39:34 -07:00
log.go all: single space after period. 2016-03-02 00:13:47 +00:00
log1p.go math: simplify the code 2020-08-15 02:20:42 +00:00
log1p_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
log10.go math: fix Log2 test failures on ppc64 (and s390) 2015-07-15 05:35:22 +00:00
log10_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
log_amd64.s math: speed up Log on amd64 2017-03-29 20:36:29 +00:00
log_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
logb.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
mod.go math: use Abs in Mod rather than if x < 0 { x = -x} 2018-10-04 17:32:44 +00:00
modf.go all: single space after period. 2016-03-02 00:13:47 +00:00
modf_arm64.s all: minor vet fixes 2016-10-24 17:27:37 +00:00
modf_ppc64x.s math: implement asm modf for ppc64x 2017-11-02 13:24:32 +00:00
nextafter.go math: change Nextafter64 to Nextafter in the description of Nextafter 2015-02-17 14:29:18 +00:00
pow.go math: use Abs in Pow rather than if x < 0 { x = -x } 2018-10-04 17:33:04 +00:00
pow10.go math: speed up and improve accuracy of Pow10 2017-02-22 19:17:04 +00:00
pow_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
remainder.go math: fix math.Remainder(-x,x) (for Inf > x > 0) 2019-03-15 14:52:51 +00:00
signbit.go all: use "reports whether" consistently in the few places that didn't 2018-11-02 22:47:58 +00:00
sin.go src, misc: apply gofmt 2019-02-19 20:38:28 +00:00
sin_s390x.s cmd/asm, math: add s390x floating point test instructions 2018-04-03 16:08:04 +00:00
sincos.go src, misc: apply gofmt 2019-02-19 20:38:28 +00:00
sinh.go math,net: omit explicit true tag expr in switch 2018-08-20 22:15:59 +00:00
sinh_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
sqrt.go math: fix typo in sqrt.go code comment 2021-01-27 00:15:06 +00:00
sqrt_386.s all: this big patch remove whitespace from assembly files 2018-10-03 15:28:51 +00:00
sqrt_amd64.s math: make sqrt smaller on AMD64 2016-09-29 15:56:52 +00:00
sqrt_arm.s all: this big patch remove whitespace from assembly files 2018-10-03 15:28:51 +00:00
sqrt_arm64.s all: make copyright headers consistent with one space after period 2016-03-01 23:34:33 +00:00
sqrt_mipsx.s runtime/cgo, math: don't use FP instructions for soft-float mips{,le} 2017-11-30 17:12:32 +00:00
sqrt_ppc64x.s all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
sqrt_riscv64.s math: implement Sqrt in assembly for riscv64 2020-02-25 16:43:26 +00:00
sqrt_s390x.s math: add functions and stubs for s390x 2016-04-06 23:35:56 +00:00
sqrt_wasm.s math, math/big: add wasm architecture 2018-05-08 13:29:22 +00:00
stubs_386.s math: remove most 387 implementations 2021-02-19 00:41:09 +00:00
stubs_amd64.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
stubs_arm.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
stubs_arm64.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
stubs_mips64x.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
stubs_mipsx.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
stubs_ppc64x.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
stubs_riscv64.s math: implement Min/Max in riscv64 assembly 2020-05-04 17:29:13 +00:00
stubs_s390x.s math: simplify hasVX checking on s390x 2020-04-27 20:06:57 +00:00
stubs_wasm.s math: consolidate assembly stub implementations 2019-04-23 14:50:16 +00:00
tan.go src, misc: apply gofmt 2019-02-19 20:38:28 +00:00
tan_s390x.s math: use s390x mnemonics rather than binary encodings 2018-08-20 17:42:08 +00:00
tanh.go src, misc: apply gofmt 2019-02-19 20:38:28 +00:00
tanh_s390x.s math: use new mnemonics for 'rotate then insert' on s390x 2019-04-16 15:34:41 +00:00
trig_reduce.go math/cmplx: implement Payne-Hanek range reduction 2020-03-14 04:12:41 +00:00
unsafe.go math: document sign bit correspondence for floating-point/bits conversions 2018-12-06 22:27:54 +00:00