21 lines
391 B
Go
21 lines
391 B
Go
//go:build 386 && !purego
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package asm
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// stmxcsr reads the MXCSR control and status register.
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//
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//go:noescape
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func stmxcsr(addr *uint32)
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// ldmxcsr writes to the MXCSR control and status register.
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//
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//go:noescape
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func ldmxcsr(addr *uint32)
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func setRoundingMode(mode uint8) {
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var csr uint32
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stmxcsr(&csr)
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csr = (csr & (^uint32(0x6000))) | ((uint32(mode) & 3) << 13)
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ldmxcsr(&csr)
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}
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