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[dev.ssa] cmd/compile/internal/ssa: implement ODOT

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Implement ODOT.  Similar to ArrayIndex, StructSelect selects a field
out of a larger Value.

We may need more ways to rewrite StructSelect, but StructSelect/Load
is the typical way it is used.

Change-Id: Ida7b8aab3298f4754eaf9fee733974cf8736e45d
Reviewed-on: https://go-review.googlesource.com/12265
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Keith Randall 2015-07-15 21:33:49 -07:00
parent 078ba138d3
commit cd7e059496
5 changed files with 50 additions and 3 deletions
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7
src/cmd/compile/internal/ssa/gen/genericOps.go
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@ -71,9 +71,10 @@ var genericOps = []opData{
{name: "IsInBounds"}, // 0 <= arg0 < arg1
// Indexing operations
{name: "ArrayIndex"}, // arg0=array, arg1=index. Returns a[i]
{name: "PtrIndex"}, // arg0=ptr, arg1=index. Computes ptr+sizeof(*v.type)*index, where index is extended to ptrwidth type
{name: "OffPtr"}, // arg0 + auxint (arg0 and result are pointers)
{name: "ArrayIndex"}, // arg0=array, arg1=index. Returns a[i]
{name: "PtrIndex"}, // arg0=ptr, arg1=index. Computes ptr+sizeof(*v.type)*index, where index is extended to ptrwidth type
{name: "OffPtr"}, // arg0 + auxint (arg0 and result are pointers)
{name: "StructSelect"}, // arg0=struct, auxint=field offset. Returns field at that offset (size=size of result type)
// Slices
{name: "SliceMake"}, // arg0=ptr, arg1=len, arg2=cap