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Keith Randall e283473ebb cmd/compile: avoid using destination pointer base type in memmove optimization 
The type of the source and destination of a memmove call isn't
always accurate. It will always be a pointer (or an unsafe.Pointer), but
the base type might not be accurate. This comes about because multiple
copies of a pointer with different base types are coalesced into a single value.

In the failing example, the IData selector of the input argument is a
*[32]byte in one branch of the type switch, and a *[]byte in the other branch.
During the expand_calls pass both IDatas become just copies of the input
register. Those copies are deduped and an arbitrary one wins (in this case,
*[]byte is the unfortunate winner).

Generally an op v can rely on v.Type during rewrite rules. But relying
on v.Args[i].Type is discouraged.

Fixes #55122

Change-Id: I348fd9accf2058a87cd191eec01d39cda612f120
Reviewed-on: https://go-review.googlesource.com/c/go/+/431496
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
 		2022-09-19 18:21:06 +00:00
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abi
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alias3.dir
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asmhdr.dir
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bench
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chan
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closure3.dir
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closure5.dir test: use dot-relative imports where appropriate 2022-03-24 02:14:15 +00:00
codegen cmd/compile: resolve known outcomes for SLTI/SLTIU on riscv64 2022-09-17 17:17:52 +00:00
ddd2.dir
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dwarf
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fixedbugs cmd/compile: avoid using destination pointer base type in memmove optimization 2022-09-19 18:21:06 +00:00
import2.dir
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import4.dir
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interface
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intrinsic.dir
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ken
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linkname.dir test: compile source files as if from "test" module 2022-03-24 17:50:47 +00:00
method4.dir
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retjmp.dir
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runtime
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stress
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syntax go/parser: adjustments to error messages 2022-09-01 22:37:04 +00:00
typeparam cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
uintptrescapes.dir
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64bit.go
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235.go
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README.md
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alg.go
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alias.go
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alias1.go
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alias2.go
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alias3.go
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align.go
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append.go
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append1.go
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args.go
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armimm.go
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asmhdr.go
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assign.go
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assign1.go
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atomicload.go
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bigalg.go
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bigmap.go
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blank.go
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blank1.go
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bom.go
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bombad.go
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bounds.go
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cannotassign.go
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chancap.go
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chanlinear.go
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char_lit.go
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char_lit1.go
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checkbce.go
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clearfat.go
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closedchan.go
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closure.go
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closure1.go
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closure2.go
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closure3.go
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closure4.go
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closure5.go
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closure6.go
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closure7.go
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cmp.go
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cmp6.go
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cmplx.go
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cmplxdivide.c
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cmplxdivide.go
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cmplxdivide1.go
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complit.go
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complit1.go
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compos.go
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const.go
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const1.go
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const2.go
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const3.go
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const4.go
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const5.go
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const6.go
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const7.go go/types, types2: check integer constant literal overflow 2022-08-16 01:11:29 +00:00
const8.go test: add more tests for const decls with ommitted RHS expressions 2022-06-28 18:11:31 +00:00
convT2X.go
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convert.go
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convert1.go
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convert2.go go/types, types2: implement slice-to-array conversions 2022-09-08 15:55:44 +00:00
convert3.go
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convert4.go
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convlit.go
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convlit1.go
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copy.go
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copy1.go
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crlf.go
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ddd.go
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ddd1.go
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ddd2.go
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decl.go
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declbad.go
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defer.go
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defererrcheck.go
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deferfin.go
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defernil.go
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deferprint.go
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deferprint.out
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devirt.go
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directive.go cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
directive2.go cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
divide.go
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divmod.go
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embedfunc.go
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embedvers.go
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empty.go
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env.go
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eof.go
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eof1.go
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escape.go
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escape2.go
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escape2n.go
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escape3.go
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escape4.go
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escape5.go
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escape_array.go
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escape_calls.go
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escape_closure.go
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escape_field.go
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escape_goto.go
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escape_hash_maphash.go
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escape_iface.go [dev.unified] test: break escape_iface.go into unified/nounified variants 2022-06-30 18:41:26 +00:00
escape_iface_nounified.go [dev.unified] test: break escape_iface.go into unified/nounified variants 2022-06-30 18:41:26 +00:00
escape_iface_unified.go [dev.unified] cmd/compile/internal/noder: implicit conversions for multi-valued expressions 2022-06-30 18:42:24 +00:00
escape_indir.go
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escape_level.go
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escape_map.go
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escape_param.go
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escape_runtime_atomic.go
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escape_selfassign.go
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escape_slice.go
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escape_struct_param1.go
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escape_struct_param2.go
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escape_struct_return.go
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escape_sync_atomic.go
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escape_unsafe.go test: fix typo in escape_unsafe.go 2022-09-07 17:25:59 +00:00
fibo.go
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finprofiled.go
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float_lit.go
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float_lit2.go
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float_lit3.go
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floatcmp.go
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for.go
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func.go
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func1.go
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func2.go
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func3.go
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func4.go
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func5.go
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func6.go
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func7.go
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func8.go
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funcdup.go
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funcdup2.go
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fuse.go
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gc.go
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gc1.go
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gc2.go
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gcgort.go
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gcstring.go
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goprint.go
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goprint.out
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goto.go
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heapsampling.go test/heapsampling.go: slow down allocation rate and reduce iterations 2022-05-27 21:36:06 +00:00
helloworld.go
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helloworld.out
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if.go
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import.go
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import1.go
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import2.go
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import4.go
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import5.go
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import6.go
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index.go
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index0.go
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index1.go
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index2.go
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indirect.go
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indirect1.go
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init.go
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init1.go
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initcomma.go
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initempty.go
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initexp.go
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initialize.go
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initializerr.go
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initloop.go
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inline.go [dev.unified] test: extract different inline test between unified and non-unified 2022-06-15 21:22:56 +00:00
inline_big.go
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inline_caller.go
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inline_callers.go
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inline_endian.go cmd/compile: make encoding/binary appends cheaper to inline 2022-09-15 21:05:02 +00:00
inline_literal.go
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inline_math_bits_rotate.go
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inline_nounified.go [dev.unified] test: extract different inline test between unified and non-unified 2022-06-15 21:22:56 +00:00
inline_sync.go sync: convert RWMutex.{readerCount,readerWait} to atomic type 2022-09-09 18:28:35 +00:00
inline_unified.go cmd/compile/internal/noder: fix inlined function literal positions 2022-08-25 18:46:22 +00:00
inline_variadic.go
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int_lit.go
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intcvt.go
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intrinsic.go
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intrinsic_atomic.go misc, test: fix test error for loong64 2022-05-20 16:16:37 +00:00
iota.go
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label.go
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label1.go
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linkmain.go
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linkmain_run.go
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linkname.go
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linkname3.go
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linkobj.go
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linkx.go
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linkx_run.go
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literal.go
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literal2.go
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live.go cmd/compile: stop using VARKILL 2022-08-18 17:36:38 +00:00
live1.go
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live2.go
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live_regabi.go cmd/compile: stop using VARKILL 2022-08-18 17:36:38 +00:00
live_uintptrkeepalive.go all: fix spelling 2022-05-17 19:51:29 +00:00
loopbce.go cmd/compile: tighten bounds for induction variables in strided loops 2022-08-31 22:04:55 +00:00
mainsig.go
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makechan.go
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makemap.go
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makenew.go
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makeslice.go
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mallocfin.go
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map.go
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map1.go
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mapclear.go
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maplinear.go
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maymorestack.go
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mergemul.go
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method.go
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method1.go
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method2.go
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method3.go
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method4.go
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method5.go
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method6.go
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method7.go
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named.go
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named1.go
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nil.go
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nilcheck.go [dev.unified] test: tweak nilcheck test 2022-06-30 18:41:59 +00:00
nilptr.go
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nilptr2.go
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nilptr3.go
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nilptr4.go
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nilptr5.go cmd/compile: handle partially overlapping assignments 2022-08-23 19:56:32 +00:00
nilptr5_aix.go
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nilptr5_wasm.go
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nilptr_aix.go
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nosplit.go misc, test: fix test error for loong64 2022-05-20 16:16:37 +00:00
nowritebarrier.go
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nul1.go
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opt_branchlikely.go
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parentype.go
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peano.go
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phiopt.go
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print.go
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print.out
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printbig.go
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printbig.out
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prove.go cmd/compile: teach prove about bitwise OR operation 2022-08-31 09:35:45 +00:00
prove_constant_folding.go cmd/compile: fold constants found by prove 2022-05-04 20:30:17 +00:00
range.go
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recover.go
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recover1.go
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recover2.go
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recover3.go
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recover4.go
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recover5.go
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reflectmethod1.go
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reflectmethod2.go
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reflectmethod3.go
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reflectmethod4.go
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reflectmethod5.go
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reflectmethod6.go
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reflectmethod7.go
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reflectmethod8.go
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rename.go
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rename1.go
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reorder.go
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reorder2.go
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retjmp.go
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return.go
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rotate.go
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rotate0.go
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rotate1.go
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rotate2.go
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rotate3.go
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run.go cmd/compile/internal/noder: fix type switch case vars package 2022-09-07 17:26:39 +00:00
rune.go
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runtime.go
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shift1.go
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shift2.go
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shift3.go cmd/compile: adjust types2 shift check to match go/types (cleanup) 2022-04-07 17:19:55 +00:00
sieve.go
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sigchld.go
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sigchld.out
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simassign.go
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sinit.go
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sinit_run.go
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sizeof.go
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slice3.go
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slice3err.go
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slicecap.go
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sliceopt.go
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solitaire.go
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stack.go
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stackobj.go
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stackobj2.go
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stackobj3.go
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strcopy.go
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strength.go
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string_lit.go
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stringrange.go
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struct0.go
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switch.go [dev.unified] test: add switch test case for tricky nil handling 2022-07-19 23:30:49 +00:00
switch2.go go/parser: adjustments to error messages 2022-09-01 22:37:04 +00:00
switch3.go
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switch4.go
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switch5.go
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switch6.go
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switch7.go
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tinyfin.go
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torture.go
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turing.go
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typecheck.go
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typecheckloop.go
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typeswitch.go
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typeswitch1.go
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typeswitch2.go
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typeswitch2b.go
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typeswitch3.go
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uintptrescapes.go
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uintptrescapes2.go
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uintptrescapes3.go
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uintptrkeepalive.go cmd/compile: add //go:uintptrkeepalive 2022-04-21 18:06:38 +00:00
undef.go
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unsafe_slice_data.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
unsafe_string.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
unsafe_string_data.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
unsafebuiltins.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
used.go
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utf.go
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varerr.go
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varinit.go
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winbatch.go
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writebarrier.go
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zerodivide.go
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README.md

The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.

To run just these tests, execute:

../bin/go run run.go

To run just tests from specified files in this directory, execute:

../bin/go run run.go -- file1.go file2.go ...

Standard library tests should be written as regular Go tests in the appropriate package.

The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:

  • it is most naturally expressed using the test runner; or
  • it is also applicable to gccgo and other Go tool chains.