| // asmcheck |
| |
| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package codegen |
| |
| // ------------------ // |
| // masked shifts // |
| // ------------------ // |
| |
| func lshMask64x64(v int64, s uint64) int64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v << (s & 63) |
| } |
| |
| func rshMask64Ux64(v uint64, s uint64) uint64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> (s & 63) |
| } |
| |
| func rshMask64x64(v int64, s uint64) int64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> (s & 63) |
| } |
| |
| func lshMask32x64(v int32, s uint64) int32 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v << (s & 63) |
| } |
| |
| func rshMask32Ux64(v uint32, s uint64) uint32 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> (s & 63) |
| } |
| |
| func rshMask32x64(v int32, s uint64) int32 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> (s & 63) |
| } |
| |
| func lshMask64x32(v int64, s uint32) int64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v << (s & 63) |
| } |
| |
| func rshMask64Ux32(v uint64, s uint32) uint64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> (s & 63) |
| } |
| |
| func rshMask64x32(v int64, s uint32) int64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> (s & 63) |
| } |
| |
| func lshMask64x32Ext(v int64, s int32) int64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v << uint(s&63) |
| } |
| |
| func rshMask64Ux32Ext(v uint64, s int32) uint64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> uint(s&63) |
| } |
| |
| func rshMask64x32Ext(v int64, s int32) int64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> uint(s&63) |
| } |
| |
| // --------------- // |
| // signed shifts // |
| // --------------- // |
| |
| // We do want to generate a test + panicshift for these cases. |
| func lshSigned(v8 int8, v16 int16, v32 int32, v64 int64, x int) { |
| // amd64:"TESTB" |
| _ = x << v8 |
| // amd64:"TESTW" |
| _ = x << v16 |
| // amd64:"TESTL" |
| _ = x << v32 |
| // amd64:"TESTQ" |
| _ = x << v64 |
| } |
| |
| // We want to avoid generating a test + panicshift for these cases. |
| func lshSignedMasked(v8 int8, v16 int16, v32 int32, v64 int64, x int) { |
| // amd64:-"TESTB" |
| _ = x << (v8 & 7) |
| // amd64:-"TESTW" |
| _ = x << (v16 & 15) |
| // amd64:-"TESTL" |
| _ = x << (v32 & 31) |
| // amd64:-"TESTQ" |
| _ = x << (v64 & 63) |
| } |
| |
| // ------------------ // |
| // bounded shifts // |
| // ------------------ // |
| |
| func lshGuarded64(v int64, s uint) int64 { |
| if s < 64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> s |
| } |
| panic("shift too large") |
| } |
| |
| func rshGuarded64U(v uint64, s uint) uint64 { |
| if s < 64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v >> s |
| } |
| panic("shift too large") |
| } |
| |
| func rshGuarded64(v int64, s uint) int64 { |
| if s < 64 { |
| // s390x:-".*AND",-".*MOVDGE" |
| return v << s |
| } |
| panic("shift too large") |
| } |
