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runtime: fix setting of cpu features for amd64
Because of wrong case of letters, the cpu features flags were not
set properly for amd64.
Fixes #48406.
Change-Id: If19782851670e91fd31d119f4701c47373fa7e71
GitHub-Last-Rev: 91c7321ca4
GitHub-Pull-Request: golang/go#48403
Reviewed-on: https://go-review.googlesource.com/c/go/+/350151
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
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@ -623,7 +623,7 @@ func cpuinit() {
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// Support cpu feature variables are used in code generated by the compiler
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// to guard execution of instructions that can not be assumed to be always supported.
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switch GOARCH {
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case "386", "AMD64":
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case "386", "amd64":
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x86HasPOPCNT = cpu.X86.HasPOPCNT
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x86HasSSE41 = cpu.X86.HasSSE41
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x86HasFMA = cpu.X86.HasFMA
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