mirror of
https://github.com/golang/go
synced 2024-11-24 23:27:57 -07:00
22 lines
616 B
Go
22 lines
616 B
Go
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// $G $D/$F.go && $L $F.$A && ./$A.out
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// # switch above to 'run' when bug gets fixed.
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// # right now it only breaks on 8g
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// Test for 8g register move bug. The optimizer gets confused
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// about 16- vs 32-bit moves during splitContractIndex.
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package main
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func main() {
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const c = 0x12345678
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index, n, offset := splitContractIndex(c)
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if index != int((c&0xffff)>>5) || n != int(c & (1<<5-1)) || offset != (c>>16)&(1<<14-1) {
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println("BUG", index, n, offset)
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}
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}
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func splitContractIndex(ce uint32) (index, n, offset int) {
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h := uint16(ce)
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return int(h >> 5), int(h & (1<<5 - 1)), int(ce>>16) & (1<<14 - 1)
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}
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