diff options
Diffstat (limited to 'src/math/dim_s390x.s')
| -rw-r--r-- | src/math/dim_s390x.s | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/math/dim_s390x.s b/src/math/dim_s390x.s new file mode 100644 index 0000000..74fdd75 --- /dev/null +++ b/src/math/dim_s390x.s @@ -0,0 +1,96 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Based on dim_amd64.s + +#include "textflag.h" + +#define PosInf 0x7FF0000000000000 +#define NaN 0x7FF8000000000001 +#define NegInf 0xFFF0000000000000 + +// func ·Max(x, y float64) float64 +TEXT ·Max(SB),NOSPLIT,$0 + // +Inf special cases + MOVD $PosInf, R4 + MOVD x+0(FP), R8 + CMPUBEQ R4, R8, isPosInf + MOVD y+8(FP), R9 + CMPUBEQ R4, R9, isPosInf + // NaN special cases + MOVD $~(1<<63), R5 // bit mask + MOVD $PosInf, R4 + MOVD R8, R2 + AND R5, R2 // x = |x| + CMPUBLT R4, R2, isMaxNaN + MOVD R9, R3 + AND R5, R3 // y = |y| + CMPUBLT R4, R3, isMaxNaN + // ±0 special cases + OR R3, R2 + BEQ isMaxZero + + FMOVD x+0(FP), F1 + FMOVD y+8(FP), F2 + FCMPU F2, F1 + BGT +3(PC) + FMOVD F1, ret+16(FP) + RET + FMOVD F2, ret+16(FP) + RET +isMaxNaN: // return NaN + MOVD $NaN, R4 +isPosInf: // return +Inf + MOVD R4, ret+16(FP) + RET +isMaxZero: + MOVD $(1<<63), R4 // -0.0 + CMPUBEQ R4, R8, +3(PC) + MOVD R8, ret+16(FP) // return 0 + RET + MOVD R9, ret+16(FP) // return other 0 + RET + +// func Min(x, y float64) float64 +TEXT ·Min(SB),NOSPLIT,$0 + // -Inf special cases + MOVD $NegInf, R4 + MOVD x+0(FP), R8 + CMPUBEQ R4, R8, isNegInf + MOVD y+8(FP), R9 + CMPUBEQ R4, R9, isNegInf + // NaN special cases + MOVD $~(1<<63), R5 + MOVD $PosInf, R4 + MOVD R8, R2 + AND R5, R2 // x = |x| + CMPUBLT R4, R2, isMinNaN + MOVD R9, R3 + AND R5, R3 // y = |y| + CMPUBLT R4, R3, isMinNaN + // ±0 special cases + OR R3, R2 + BEQ isMinZero + + FMOVD x+0(FP), F1 + FMOVD y+8(FP), F2 + FCMPU F2, F1 + BLT +3(PC) + FMOVD F1, ret+16(FP) + RET + FMOVD F2, ret+16(FP) + RET +isMinNaN: // return NaN + MOVD $NaN, R4 +isNegInf: // return -Inf + MOVD R4, ret+16(FP) + RET +isMinZero: + MOVD $(1<<63), R4 // -0.0 + CMPUBEQ R4, R8, +3(PC) + MOVD R9, ret+16(FP) // return other 0 + RET + MOVD R8, ret+16(FP) // return -0 + RET + |