| // Copyright 2022 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. |
| |
| // Prefer SARX/SHLX/SHRX instruction because it has less register restriction on the shift input. |
| (SAR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SARX(Q|L) x y) |
| (SHL(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SHLX(Q|L) x y) |
| (SHR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SHRX(Q|L) x y) |
| |
| // See comments in ARM64latelower.rules for why these are here. |
| (MOVLQZX x) && zeroUpper32Bits(x,3) => x |
| (MOVWQZX x) && zeroUpper48Bits(x,3) => x |
| (MOVBQZX x) && zeroUpper56Bits(x,3) => x |
