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runtime: speed up eqstring
eqstring does not need to check the length of the strings. Other architectures were done in a separate commit. While we're here, add a pointer equality check. Change-Id: Id2c8616a03a7da7037c1e9ccd56a549fc952bd98 Reviewed-on: https://go-review.googlesource.com/3956 Reviewed-by: Keith Randall <khr@golang.org>
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@ -969,30 +969,30 @@ eq:
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RETURN
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RETURN
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// eqstring tests whether two strings are equal.
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// eqstring tests whether two strings are equal.
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// The compiler guarantees that strings passed
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// to eqstring have equal length.
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// See runtime_test.go:eqstring_generic for
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// See runtime_test.go:eqstring_generic for
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// equivalent Go code.
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// equivalent Go code.
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TEXT runtime·eqstring(SB),NOSPLIT,$0-33
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TEXT runtime·eqstring(SB),NOSPLIT,$0-33
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MOVD s1len+8(FP), R4
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MOVD s2len+24(FP), R5
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CMP R4, R5
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BNE noteq
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MOVD s1str+0(FP), R3
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MOVD s1str+0(FP), R3
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MOVD s2str+16(FP), R4
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MOVD s2str+16(FP), R4
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MOVD $1, R5
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MOVB R5, ret+32(FP)
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CMP R3, R4
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BNE 2(PC)
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RETURN
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MOVD s1len+8(FP), R5
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SUB $1, R3
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SUB $1, R3
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SUB $1, R4
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SUB $1, R4
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ADD R3, R5, R8
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ADD R3, R5, R8
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loop:
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loop:
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CMP R3, R8
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CMP R3, R8
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BNE 4(PC)
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BNE 2(PC)
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MOVD $1, R3
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MOVB R3, ret+32(FP)
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RETURN
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RETURN
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MOVBZU 1(R3), R6
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MOVBZU 1(R3), R6
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MOVBZU 1(R4), R7
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MOVBZU 1(R4), R7
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CMP R6, R7
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CMP R6, R7
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BEQ loop
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BEQ loop
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noteq:
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MOVB R0, ret+32(FP)
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MOVB R0, ret+32(FP)
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RETURN
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RETURN
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