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cmd/compile: add jump table codegen test

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Change-Id: Ic67f676f5ebe146166a0d3c1d78a802881320e49
Reviewed-on: https://go-review.googlesource.com/c/go/+/400375
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
Keith Randall 2022-04-14 13:14:18 -07:00 committed by Keith Randall
parent 3d8cb26504
commit c4b2288755
1 changed files with 50 additions and 0 deletions
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50
test/codegen/switch.go
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@ -20,3 +20,53 @@ func f(x string) int {
return -3
}
}
// use jump tables for 8+ int cases
func square(x int) int {
// amd64:`JMP\s\(.*\)\(.*\)$`
switch x {
case 1:
return 1
case 2:
return 4
case 3:
return 9
case 4:
return 16
case 5:
return 25
case 6:
return 36
case 7:
return 49
case 8:
return 64
default:
return x * x
}
}
// use jump tables for 8+ string lengths
func length(x string) int {
// amd64:`JMP\s\(.*\)\(.*\)$`
switch x {
case "a":
return 1
case "bb":
return 2
case "ccc":
return 3
case "dddd":
return 4
case "eeeee":
return 5
case "ffffff":
return 6
case "ggggggg":
return 7
case "hhhhhhhh":
return 8
default:
return len(x)
}
}