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Disallow branching to the entry block.

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Functions that would otherwise start with a loop should start with a
separate ebb which just branches to the header of the loop.
This commit is contained in:
Dan Gohman
2017-10-09 14:59:08 -07:00
parent 893a6716c6
commit 6aeeaebbd3
5 changed files with 133 additions and 116 deletions
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65
cranelift/filetests/licm/nested_loops.cton
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@@ -3,50 +3,53 @@ test licm
function %nested_loops(i32) -> i32 {
ebb0(v0: i32):
v1 = iconst.i32 1
v2 = iconst.i32 2
v3 = iadd v1, v2
v4 = isub v0, v1
jump ebb1(v4,v4)
jump ebb1(v0)
ebb1(v10: i32,v11: i32):
brz v11, ebb2(v10)
ebb1(v1: i32):
v2 = iconst.i32 1
v3 = iconst.i32 2
v4 = iadd v2, v3
v5 = isub v1, v2
jump ebb2(v5, v5)
ebb2(v10: i32, v11: i32):
brz v11, ebb3(v10)
v12 = iconst.i32 1
v15 = iadd v12, v4
v15 = iadd v12, v5
v13 = isub v11, v12
jump ebb1(v10,v13)
jump ebb2(v10,v13)
ebb2(v20: i32):
brz v20, ebb3(v20)
jump ebb0(v20)
ebb3(v20: i32):
brz v20, ebb4(v20)
jump ebb1(v20)
ebb3(v30: i32):
ebb4(v30: i32):
return v30
}
; sameln:function %nested_loops(i32) -> i32 {
; nextln: ebb4(v12: i32):
; nextln: v1 = iconst.i32 1
; nextln: v2 = iconst.i32 2
; nextln: v3 = iadd v1, v2
; nextln: v7 = iconst.i32 1
; nextln: jump ebb0(v12)
; nextln:
; nextln: ebb0(v0: i32):
; nextln: v4 = isub v0, v1
; nextln: v8 = iadd.i32 v7, v4
; nextln: jump ebb1(v4, v4)
; nextln: v2 = iconst.i32 1
; nextln: v3 = iconst.i32 2
; nextln: v4 = iadd v2, v3
; nextln: v8 = iconst.i32 1
; nextln: jump ebb1(v0)
; nextln:
; nextln: ebb1(v5: i32, v6: i32):
; nextln: brz v6, ebb2(v5)
; nextln: v9 = isub v6, v7
; nextln: jump ebb1(v5, v9)
; nextln: ebb1(v1: i32):
; nextln: v5 = isub v1, v2
; nextln: v9 = iadd.i32 v8, v5
; nextln: jump ebb2(v5, v5)
; nextln:
; nextln: ebb2(v10: i32):
; nextln: brz v10, ebb3(v10)
; nextln: jump ebb0(v10)
; nextln: ebb2(v6: i32, v7: i32):
; nextln: brz v7, ebb3(v6)
; nextln: v10 = isub v7, v8
; nextln: jump ebb2(v6, v10)
; nextln:
; nextln: ebb3(v11: i32):
; nextln: return v11
; nextln: brz v11, ebb4(v11)
; nextln: jump ebb1(v11)
; nextln:
; nextln: ebb4(v12: i32):
; nextln: return v12
; nextln: }