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sm9/bn256: remove useless tmp value storage

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Sun Yimin 2023-07-28 11:19:58 +08:00 committed by GitHub
parent 9035a35b64
commit ca474a67ba
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1 changed files with 30 additions and 35 deletions
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sm9/bn256/gfp2_g1_amd64.s
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@ -1257,11 +1257,8 @@ TEXT ·gfp2Square(SB),NOSPLIT,$160-16
LDacc (axin)
gfpMulBy2Inline
STt (cxout)
LDacc (ayin)
CALL gfpSubInternal(SB)
ST (cxout)
LDt (cyout)
CALL gfpMulInternal(SB)
@ -1319,11 +1316,9 @@ TEXT ·gfp2SquareU(SB),NOSPLIT,$160-16
LDacc (axin)
gfpMulBy2Inline
STt (cyout)
LDacc (ayin)
CALL gfpSubInternal(SB)
ST (cyout)
LDt (cxout)
CALL gfpMulInternal(SB)
@ -1494,36 +1489,6 @@ TEXT ·curvePointDoubleComplete(SB),NOSPLIT,$288-16
#undef tmp2
#undef rptr
// gfpIsZero returns 1 in AX if [acc4..acc7] represents zero and zero
// otherwise. It writes to [acc4..acc7], t0 and t1.
TEXT gfpIsZero(SB),NOSPLIT,$0
// AX contains a flag that is set if the input is zero.
XORQ AX, AX
MOVQ $1, t1
// Check whether [acc4..acc7] are all zero.
MOVQ acc4, t0
ORQ acc5, t0
ORQ acc6, t0
ORQ acc7, t0
// Set the zero flag if so. (CMOV of a constant to a register doesn't
// appear to be supported in Go. Thus t1 = 1.)
CMOVQEQ t1, AX
// XOR [acc4..acc7] with P and compare with zero again.
XORQ ·p2+0(SB), acc4
XORQ ·p2+8(SB), acc5
XORQ ·p2+16(SB), acc6
XORQ ·p2+24(SB), acc7
ORQ acc5, acc4
ORQ acc6, acc4
ORQ acc7, acc4
// Set the zero flag if so.
CMOVQEQ t1, AX
RET
/* ---------------------------------------*/
#define x1in(off) (32*0 + off)(SP)
#define y1in(off) (32*1 + off)(SP)
@ -1775,6 +1740,36 @@ pointadd_avx2:
/* ---------------------------------------*/
/*
// gfpIsZero returns 1 in AX if [acc4..acc7] represents zero and zero
// otherwise. It writes to [acc4..acc7], t0 and t1.
TEXT gfpIsZero(SB),NOSPLIT,$0
// AX contains a flag that is set if the input is zero.
XORQ AX, AX
MOVQ $1, t1
// Check whether [acc4..acc7] are all zero.
MOVQ acc4, t0
ORQ acc5, t0
ORQ acc6, t0
ORQ acc7, t0
// Set the zero flag if so. (CMOV of a constant to a register doesn't
// appear to be supported in Go. Thus t1 = 1.)
CMOVQEQ t1, AX
// XOR [acc4..acc7] with P and compare with zero again.
XORQ ·p2+0(SB), acc4
XORQ ·p2+8(SB), acc5
XORQ ·p2+16(SB), acc6
XORQ ·p2+24(SB), acc7
ORQ acc5, acc4
ORQ acc6, acc4
ORQ acc7, acc4
// Set the zero flag if so.
CMOVQEQ t1, AX
RET
#define x1in(off) (32*0 + off)(SP)
#define y1in(off) (32*1 + off)(SP)
#define z1in(off) (32*2 + off)(SP)