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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
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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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