77 lines
1.3 KiB
ArmAsm
77 lines
1.3 KiB
ArmAsm
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// System, string-primitive and x87 families: flag register moves, the
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// serialising instructions, MOVS/STOS, the MXCSR pair, scalar float-to-int
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// conversions and FMOVD. Every result is folded back so no instruction is
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// dead.
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#include "textflag.h"
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// func system(x uint64) uint64
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TEXT ·system(SB), NOSPLIT, $0-16
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MOVQ x+0(FP), AX
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PUSHFQ
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POPFQ
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CPUID
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RDTSC
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RDTSCP
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SYSCALL
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XGETBV
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PAUSE
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LFENCE
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MFENCE
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SFENCE
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UNDEF
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XORQ AX, BX
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MOVQ BX, ret+8(FP)
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RET
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// func stringprim(p *byte, n int) uint64
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TEXT ·stringprim(SB), NOSPLIT, $0-24
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MOVQ p+0(FP), DI
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MOVQ n+8(FP), CX
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LEAQ buf<>(SB), AX
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MOVQ AX, SI
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CLD
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MOVSB
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MOVSW
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MOVSL
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MOVSQ
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STOSB
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STOSQ
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STOSL
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STOSW
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MOVQ DI, ret+16(FP)
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RET
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DATA buf<>+0x00(SB)/8, $0
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GLOBL buf<>(SB), NOPTR, $8
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// func intgate(x uint64) uint64
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TEXT ·intgate(SB), NOSPLIT, $0-16
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MOVQ x+0(FP), AX
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INT $3
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MOVQ AX, ret+8(FP)
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RET
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// func fpmxcsr(x float64, csr *uint32) int64
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TEXT ·fpmxcsr(SB), NOSPLIT, $0-24
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MOVQ x+0(FP), X0
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MOVQ csr+8(FP), AX
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STMXCSR (AX)
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LDMXCSR (AX)
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CVTSD2SL X0, CX
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CVTTSD2SQ X0, DX
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MOVL (AX), SI
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MOVQ SI, ret+8(FP)
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RET
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// func fmove(p *float64) float64
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TEXT ·fmove(SB), NOSPLIT, $0-16
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MOVQ p+0(FP), AX
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FMOVD (AX), F0
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FMOVD F0, F1
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FMOVD F0, (AX)
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MOVQ (AX), AX
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MOVQ AX, ret+8(FP)
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RET
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