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bac4e2f241
Fixes #61629 This reduce the pressure on regalloc because then the loop only keep alive one value (the iterator) instead of the iterator and the upper bound since the comparison now acts against an immediate, often zero which can be skipped. This optimize things like: for i := 0; i < n; i++ { Or a range over a slice where the index is not used: for _, v := range someSlice { Or the new range over int from #61405: for range n { It is hit in 975 unique places while doing ./make.bash. Change-Id: I5facff8b267a0b60ea3c1b9a58c4d74cdb38f03f Reviewed-on: https://go-review.googlesource.com/c/go/+/512935 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Jorropo <jorropo.pgm@gmail.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Keith Randall <khr@golang.org>
11 lines
223 B
Go
11 lines
223 B
Go
// +build amd64
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// errorcheck -0 -d=ssa/prove/debug=1
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package main
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func invert(b func(), n int) {
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for i := 0; i < n; i++ { // ERROR "(Inverted loop iteration|Induction variable: limits \[0,\?\), increment 1)"
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b()
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}
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}
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