[dev.simd] all: merge master (ca37d24) into dev.simd

Conflicts:

- src/cmd/compile/internal/typecheck/builtin.go

Merge List:

+ 2025-11-20 ca37d24e0b net/http: drop unused "broken" field from persistConn
+ 2025-11-20 4b740af56a cmd/internal/obj/x86: handle global reference in From3 in dynlink mode
+ 2025-11-20 790384c6c2 spec: adjust rule for type parameter on RHS of alias declaration
+ 2025-11-20 a49b0302d0 net/http: correctly close fake net.Conns
+ 2025-11-20 32f5aadd2f cmd/compile: stack allocate backing stores during append
+ 2025-11-20 a18aff8057 runtime: select GC mark workers during start-the-world
+ 2025-11-20 829779f4fe runtime: split findRunnableGCWorker in two
+ 2025-11-20 ab59569099 go/version: use "custom" as an example of a version suffix
+ 2025-11-19 c4bb9653ba cmd/compile: Implement LoweredZeroLoop with LSX Instruction on loong64
+ 2025-11-19 7f2ae21fb4 cmd/internal/obj/loong64: add MULW.D.W[U] instructions
+ 2025-11-19 a2946f2385 crypto: add Encapsulator and Decapsulator interfaces
+ 2025-11-19 6b83bd7146 crypto/ecdh: add KeyExchanger interface
+ 2025-11-19 4fef9f8b55 go/types, types2: fix object path for grouped declaration statements
+ 2025-11-19 33529db142 spec: escape double-ampersands
+ 2025-11-19 dc42565a20 cmd/compile: fix control flow for unsigned divisions proof relations
+ 2025-11-19 e64023dcbf cmd/compile: cleanup useless if statement in prove
+ 2025-11-19 2239520d1c test: go fmt prove.go tests
+ 2025-11-19 489d3dafb7 math: switch s390x math.Pow to generic implementation
+ 2025-11-18 8c41a482f9 runtime: add dlog.hexdump
+ 2025-11-18 e912618bd2 runtime: add hexdumper
+ 2025-11-18 2cf9d4b62f Revert "net/http: do not discard body content when closing it within request handlers"
+ 2025-11-18 4d0658bb08 cmd/compile: prefer fixed registers for values
+ 2025-11-18 ba634ca5c7 cmd/compile: fold boolean NOT into branches
+ 2025-11-18 8806d53c10 cmd/link: align sections, not symbols after DWARF compress
+ 2025-11-18 c93766007d runtime: do not print recovered when double panic with the same value
+ 2025-11-18 9859b43643 cmd/asm,cmd/compile,cmd/internal/obj/riscv: use compressed instructions on riscv64
+ 2025-11-17 b9ef0633f6 cmd/internal/sys,internal/goarch,runtime: enable the use of compressed instructions on riscv64
+ 2025-11-17 a087dea869 debug/elf: sync new loong64 relocation types up to LoongArch ELF psABI v20250521
+ 2025-11-17 e1a12c781f cmd/compile: use 32x32->64 multiplies on arm64
+ 2025-11-17 6caab99026 runtime: relax TestMemoryLimit on darwin a bit more
+ 2025-11-17 eda2e8c683 runtime: clear frame pointer at thread entry points
+ 2025-11-17 6919858338 runtime: rename findrunnable references to findRunnable
+ 2025-11-17 8e734ec954 go/ast: fix BasicLit.End position for raw strings containing \r
+ 2025-11-17 592775ec7d crypto/mlkem: avoid a few unnecessary inverse NTT calls
+ 2025-11-17 590cf18daf crypto/mlkem/mlkemtest: add derandomized Encapsulate768/1024
+ 2025-11-17 c12c337099 cmd/compile: teach prove about subtract idioms
+ 2025-11-17 bc15963813 cmd/compile: clean up prove pass
+ 2025-11-17 1297fae708 go/token: add (*File).End method
+ 2025-11-17 65c09eafdf runtime: hoist invariant code out of heapBitsSmallForAddrInline
+ 2025-11-17 594129b80c internal/runtime/maps: update doc for table.Clear
+ 2025-11-15 c58d075e9a crypto/rsa: deprecate PKCS#1 v1.5 encryption
+ 2025-11-14 d55ecea9e5 runtime: usleep before stealing runnext only if not in syscall
+ 2025-11-14 410ef44f00 cmd: update x/tools to 59ff18c
+ 2025-11-14 50128a2154 runtime: support runtime.freegc in size-specialized mallocs for noscan objects
+ 2025-11-14 c3708350a4 cmd/go: tests: rename git-min-vers->git-sha256
+ 2025-11-14 aea881230d std: fix printf("%q", int) mistakes
+ 2025-11-14 120f1874ef runtime: add more precise test of assist credit handling for runtime.freegc
+ 2025-11-14 fecfcaa4f6 runtime: add runtime.freegc to reduce GC work
+ 2025-11-14 5a347b775e runtime: set GOEXPERIMENT=runtimefreegc to disabled by default
+ 2025-11-14 1a03d0db3f runtime: skip tests for GOEXPERIMENT=arenas that do not handle clobberfree=1
+ 2025-11-14 cb0d9980f5 net/http: do not discard body content when closing it within request handlers
+ 2025-11-14 03ed43988f cmd/compile: allow multi-field structs to be stored directly in interfaces
+ 2025-11-14 1bb1f2bf0c runtime: put AddCleanup cleanup arguments in their own allocation
+ 2025-11-14 9fd2e44439 runtime: add AddCleanup benchmark
+ 2025-11-14 80c91eedbb runtime: ensure weak handles end up in their own allocation
+ 2025-11-14 7a8d0b5d53 runtime: add debug mode to extend _Grunning-without-P windows
+ 2025-11-14 710abf74da internal/runtime/cgobench: add Go function call benchmark for comparison
+ 2025-11-14 b24aec598b doc, cmd/internal/obj/riscv: document the riscv64 assembler
+ 2025-11-14 a0e738c657 cmd/compile/internal: remove incorrect riscv64 SLTI rule
+ 2025-11-14 2cdcc4150b cmd/compile: fold negation into multiplication
+ 2025-11-14 b57962b7c7 bytes: fix panic in bytes.Buffer.Peek
+ 2025-11-14 0a569528ea cmd/compile: optimize comparisons with single bit difference
+ 2025-11-14 1e5e6663e9 cmd/compile: remove unnecessary casts and types from riscv64 rules
+ 2025-11-14 ddd8558e61 go/types, types2: swap object.color for Checker.objPathIdx
+ 2025-11-14 9daaab305c cmd/link/internal/ld: make runtime.buildVersion with experiments valid
+ 2025-11-13 d50a571ddf test: fix tests to work with sizespecializedmalloc turned off
+ 2025-11-13 704f841eab cmd/trace: annotation proc start/stop with thread and proc always
+ 2025-11-13 17a02b9106 net/http: remove unused isLitOrSingle and isNotToken
+ 2025-11-13 ff61991aed cmd/go: fix flaky TestScript/mod_get_direct
+ 2025-11-13 129d0cb543 net/http/cgi: accept INCLUDED as protocol for server side includes
+ 2025-11-13 77c5130100 go/types: minor simplification
+ 2025-11-13 7601cd3880 go/types: generate cycles.go
+ 2025-11-13 7a372affd9 go/types, types2: rename definedType to declaredType and clarify docs

Change-Id: Ibaa9bdb982364892f80e511c1bb12661fcd5fb86

1 files changed, 76 insertions, 0 deletions

diff --git a/src/runtime/export_test.go b/src/runtime/export_test.go
index 3a781b7551..6e0360aaca 100644
--- a/src/runtime/export_test.go
+++ b/src/runtime/export_test.go
@@ -238,6 +238,12 @@ func SetEnvs(e []string) { envs = e }
 
 const PtrSize = goarch.PtrSize
 
+const ClobberdeadPtr = clobberdeadPtr
+
+func Clobberfree() bool {
+	return debug.clobberfree != 0
+}
+
 var ForceGCPeriod = &forcegcperiod
 
 // SetTracebackEnv is like runtime/debug.SetTraceback, but it raises
@@ -633,6 +639,34 @@ func RunGetgThreadSwitchTest() {
 	}
 }
 
+// Expose freegc for testing.
+func Freegc(p unsafe.Pointer, size uintptr, noscan bool) {
+	freegc(p, size, noscan)
+}
+
+// Expose gcAssistBytes for the current g for testing.
+func AssistCredit() int64 {
+	assistG := getg()
+	if assistG.m.curg != nil {
+		assistG = assistG.m.curg
+	}
+	return assistG.gcAssistBytes
+}
+
+// Expose gcBlackenEnabled for testing.
+func GcBlackenEnable() bool {
+	// Note we do a non-atomic load here.
+	// Some checks against gcBlackenEnabled (e.g., in mallocgc)
+	// are currently done via non-atomic load for performance reasons,
+	// but other checks are done via atomic load (e.g., in mgcmark.go),
+	// so interpreting this value in a test may be subtle.
+	return gcBlackenEnabled != 0
+}
+
+const SizeSpecializedMallocEnabled = sizeSpecializedMallocEnabled
+
+const RuntimeFreegcEnabled = runtimeFreegcEnabled
+
 const (
 	PageSize         = pageSize
 	PallocChunkPages = pallocChunkPages
@@ -1472,6 +1506,15 @@ func Releasem() {
 	releasem(getg().m)
 }
 
+// GoschedIfBusy is an explicit preemption check to call back
+// into the scheduler. This is useful for tests that run code
+// which spend most of their time as non-preemptible, as it
+// can be placed right after becoming preemptible again to ensure
+// that the scheduler gets a chance to preempt the goroutine.
+func GoschedIfBusy() {
+	goschedIfBusy()
+}
+
 type PIController struct {
 	piController
 }
@@ -1988,3 +2031,36 @@ func (head *ListHeadManual) Pop() unsafe.Pointer {
 func (head *ListHeadManual) Remove(p unsafe.Pointer) {
 	head.l.remove(p)
 }
+
+func Hexdumper(base uintptr, wordBytes int, mark func(addr uintptr, start func()), data ...[]byte) string {
+	buf := make([]byte, 0, 2048)
+	getg().writebuf = buf
+	h := hexdumper{addr: base, addrBytes: 4, wordBytes: uint8(wordBytes)}
+	if mark != nil {
+		h.mark = func(addr uintptr, m hexdumpMarker) {
+			mark(addr, m.start)
+		}
+	}
+	for _, d := range data {
+		h.write(d)
+	}
+	h.close()
+	n := len(getg().writebuf)
+	getg().writebuf = nil
+	if n == cap(buf) {
+		panic("Hexdumper buf too small")
+	}
+	return string(buf[:n])
+}
+
+func HexdumpWords(p, bytes uintptr) string {
+	buf := make([]byte, 0, 2048)
+	getg().writebuf = buf
+	hexdumpWords(p, bytes, nil)
+	n := len(getg().writebuf)
+	getg().writebuf = nil
+	if n == cap(buf) {
+		panic("HexdumpWords buf too small")
+	}
+	return string(buf[:n])
+}