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The 'nodarg' function is used to obtain a Node* representing a function argument or result. It returned a brand new Node*, but that violates the guarantee in most places in the compiler that two Node*s refer to the same variable if and only if they are the same Node* pointer. Reestablish that invariant by making nodarg return a preexisting named variable if present. Having fixed that, avoid any copy during x=x in componentgen, because the VARDEF we emit before the copy marks the lhs x as dead incorrectly. The change in walk.c avoids modifying the result of nodarg. This was the only place in the compiler that did so. Fixes #8097. LGTM=r, khr R=golang-codereviews, r, khr CC=golang-codereviews, iant https://golang.org/cl/102820043 |
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| .. | ||
| cgen64.c | ||
| cgen.c | ||
| doc.go | ||
| galign.c | ||
| gg.h | ||
| ggen.c | ||
| gobj.c | ||
| gsubr.c | ||
| Makefile | ||
| opt.h | ||
| peep.c | ||
| prog.c | ||
| reg.c | ||