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runtime: implement cmpstring and bytes.Compare in assembly for ppc64
Change-Id: I15bf55aa5ac3588c05f0a253f583c52bab209892 Reviewed-on: https://go-review.googlesource.com/14041 Reviewed-by: Dave Cheney <dave@cheney.net>
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@ -1115,6 +1115,65 @@ notfound:
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MOVD R3, ret+24(FP)
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RET
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TEXT runtime·cmpstring(SB),NOSPLIT,$-4-40
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MOVD s1_base+0(FP), R5
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MOVD s1_len+8(FP), R3
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MOVD s2_base+16(FP), R6
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MOVD s2_len+24(FP), R4
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MOVD $ret+32(FP), R7
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BR runtime·cmpbody<>(SB)
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TEXT bytes·Compare(SB),NOSPLIT,$-4-56
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MOVD s1+0(FP), R5
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MOVD s1+8(FP), R3
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MOVD s2+24(FP), R6
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MOVD s2+32(FP), R4
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MOVD $ret+48(FP), R7
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BR runtime·cmpbody<>(SB)
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// On entry:
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// R3 is the length of s1
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// R4 is the length of s2
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// R5 points to the start of s1
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// R6 points to the start of s2
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// R7 points to return value (-1/0/1 will be written here)
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//
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// On exit:
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// R5, R6, R8, R9 and R10 are clobbered
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TEXT runtime·cmpbody<>(SB),NOSPLIT,$-4-0
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CMP R5, R6
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BEQ samebytes // same starting pointers; compare lengths
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SUB $1, R5
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SUB $1, R6
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MOVD R4, R8
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CMP R3, R4
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BGE 2(PC)
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MOVD R3, R8 // R8 is min(R3, R4)
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ADD R5, R8 // R5 is current byte in s1, R8 is last byte in s1 to compare
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loop:
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CMP R5, R8
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BEQ samebytes // all compared bytes were the same; compare lengths
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MOVBZU 1(R5), R9
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MOVBZU 1(R6), R10
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CMP R9, R10
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BEQ loop
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// bytes differed
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MOVD $1, R4
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BGT 2(PC)
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NEG R4
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MOVD R4, (R7)
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RET
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samebytes:
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MOVD $1, R8
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CMP R3, R4
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BNE 3(PC)
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MOVD R0, (R7)
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RET
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BGT 2(PC)
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NEG R8
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MOVD R8, (R7)
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RET
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TEXT runtime·fastrand1(SB), NOSPLIT, $0-4
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MOVD g_m(g), R4
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MOVWZ m_fastrand(R4), R3
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@ -2,9 +2,9 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Routines that are implemented in assembly in asm_{amd64,386,arm,arm64}.s
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// Routines that are implemented in assembly in asm_{amd64,386,arm,arm64,ppc64x}.s
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// +build ppc64 ppc64le
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// +build ignore
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package runtime
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