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| author | Joel Sing <joel@sing.id.au> | 2020-02-26 04:00:10 +1100 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2020-02-28 14:33:28 +0000 |
| commit | 8955a56da015890f317d5f6919391503b854d93a (patch) | |
| tree | 59483143777c46d5d25fe01103dd9f3c1b1ffd0f /src/cmd/compile/internal/ssa/opGen.go | |
| parent | 44286d09c5fcdb703624fad6ce24306294cab1fe (diff) | |
| download | go-8955a56da015890f317d5f6919391503b854d93a.tar.gz go-8955a56da015890f317d5f6919391503b854d93a.zip | |
cmd/compile: improve SignExt32to64 on riscv64
SignExt32to64 can be implemented with a single ADDIW instruction, rather than
the two shifts that are in use currently.
Change-Id: Ie1bbaef4018f1ba5162773fc64fa5a887457cfc9
Reviewed-on: https://go-review.googlesource.com/c/go/+/220922
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/cmd/compile/internal/ssa/opGen.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/opGen.go | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/opGen.go b/src/cmd/compile/internal/ssa/opGen.go index a810d9fbc6..b951065e7c 100644 --- a/src/cmd/compile/internal/ssa/opGen.go +++ b/src/cmd/compile/internal/ssa/opGen.go @@ -1884,6 +1884,7 @@ const ( OpRISCV64ADD OpRISCV64ADDI + OpRISCV64ADDIW OpRISCV64SUB OpRISCV64SUBW OpRISCV64MUL @@ -25016,6 +25017,20 @@ var opcodeTable = [...]opInfo{ }, }, { + name: "ADDIW", + auxType: auxInt64, + argLen: 1, + asm: riscv.AADDIW, + reg: regInfo{ + inputs: []inputInfo{ + {0, 1073741812}, // X3 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 X15 X16 X17 X18 X19 X20 X21 X22 X23 X24 X25 X26 X27 X28 X29 X30 + }, + outputs: []outputInfo{ + {0, 1073741812}, // X3 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 X15 X16 X17 X18 X19 X20 X21 X22 X23 X24 X25 X26 X27 X28 X29 X30 + }, + }, + }, + { name: "SUB", argLen: 2, asm: riscv.ASUB, |