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cmd/compile: classify more nodes as "poor choices" for statements

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Aggregate-making nodes that are later decomposed
are poor choices for statements, because the decomposition
phase turns them into multiple sub-values, some of which may be
dead.  Better to look elsewhere for a statement mark.

Change-Id: Ibd9584138ab3d1384548686896a28580a2e43f54
Reviewed-on: https://go-review.googlesource.com/c/go/+/198477
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
David Chase 2019-09-30 11:08:43 -04:00
parent 6139019efa
commit 53bd915109
1 changed files with 3 additions and 1 deletions
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4
src/cmd/compile/internal/ssa/numberlines.go
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@ -15,7 +15,9 @@ func isPoorStatementOp(op Op) bool {
switch op {
// Note that Nilcheck often vanishes, but when it doesn't, you'd love to start the statement there
// so that a debugger-user sees the stop before the panic, and can examine the value.
case OpAddr, OpLocalAddr, OpOffPtr, OpStructSelect, OpConstBool, OpConst8, OpConst16, OpConst32, OpConst64, OpConst32F, OpConst64F:
case OpAddr, OpLocalAddr, OpOffPtr, OpStructSelect,
OpIMake, OpStringMake, OpSliceMake, OpStructMake0, OpStructMake1, OpStructMake2, OpStructMake3, OpStructMake4,
OpConstBool, OpConst8, OpConst16, OpConst32, OpConst64, OpConst32F, OpConst64F:
return true
}
return false