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Support heaps with no offset-guard pages.

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Also, say "guard-offset pages" rather than just "guard pages" to describe the
region of a heap which is never accessible and which exists to support
optimizations for heap accesses with offsets.

And, introduce a `Uimm64` immediate type, and make all heap fields use
`Uimm64` instead of `Imm64` since they really are unsigned.
This commit is contained in:
Dan Gohman
2018-11-29 04:53:30 -08:00
parent 93696a80bb
commit a20c852148
27 changed files with 302 additions and 172 deletions
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cranelift/filetests/simple_gvn/readonly.clif
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@@ -5,7 +5,7 @@ target x86_64
function %eliminate_redundant_global_loads(i32, i64 vmctx) {
gv0 = vmctx
gv1 = load.i64 notrap aligned readonly gv0
heap0 = static gv1, min 0x1_0000, bound 0x1_0000_0000, guard 0x8000_0000, index_type i32
heap0 = static gv1, min 0x1_0000, bound 0x1_0000_0000, offset_guard 0x8000_0000, index_type i32
ebb0(v0: i32, v1: i64):
v2 = heap_addr.i64 heap0, v0, 1