diff options
Diffstat (limited to 'src/runtime/mkpreempt.go')
| -rw-r--r-- | src/runtime/mkpreempt.go | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/runtime/mkpreempt.go b/src/runtime/mkpreempt.go index 1d614dd003..3a9e6cc478 100644 --- a/src/runtime/mkpreempt.go +++ b/src/runtime/mkpreempt.go @@ -2,6 +2,7 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. +//go:build ignore // +build ignore // mkpreempt generates the asyncPreempt functions for each @@ -229,12 +230,16 @@ func genAMD64() { if reg == "SP" || reg == "BP" { continue } - if strings.HasPrefix(reg, "X") { - l.add("MOVUPS", reg, 16) - } else { + if !strings.HasPrefix(reg, "X") { l.add("MOVQ", reg, 8) } } + lSSE := layout{stack: l.stack, sp: "SP"} + for _, reg := range regNamesAMD64 { + if strings.HasPrefix(reg, "X") { + lSSE.add("MOVUPS", reg, 16) + } + } // TODO: MXCSR register? @@ -243,10 +248,12 @@ func genAMD64() { p("// Save flags before clobbering them") p("PUSHFQ") p("// obj doesn't understand ADD/SUB on SP, but does understand ADJSP") - p("ADJSP $%d", l.stack) + p("ADJSP $%d", lSSE.stack) p("// But vet doesn't know ADJSP, so suppress vet stack checking") p("NOP SP") + l.save() + // Apparently, the signal handling code path in darwin kernel leaves // the upper bits of Y registers in a dirty state, which causes // many SSE operations (128-bit and narrower) become much slower. @@ -258,10 +265,11 @@ func genAMD64() { p("VZEROUPPER") p("#endif") - l.save() + lSSE.save() p("CALL ·asyncPreempt2(SB)") + lSSE.restore() l.restore() - p("ADJSP $%d", -l.stack) + p("ADJSP $%d", -lSSE.stack) p("POPFQ") p("POPQ BP") p("RET") |