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https://github.com/golang/go
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runtime, math/big: allow R0 on s390x to contain values other than 0
The new SSA backend for s390x can use R0 as a general purpose register. This change modifies assembly code to either avoid using R0 entirely or explicitly set R0 to 0. R0 can still be safely used as 0 in address calculations. Change-Id: I3efa723e9ef322a91a408bd8c31768d7858526c8 Reviewed-on: https://go-review.googlesource.com/28976 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Michael Munday
parent
43bdfa9337
commit
f1515a01fd
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@ -271,6 +271,7 @@ E4: MOVD R4, c+56(FP) // return c
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// func shlVU(z, x []Word, s uint) (c Word)
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TEXT ·shlVU(SB),NOSPLIT,$0
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MOVD z_len+8(FP), R5
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MOVD $0, R0
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SUB $1, R5 // n--
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BLT X8b // n < 0 (n <= 0)
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@ -358,6 +359,7 @@ E864: CMPBGT R5, R0, L864 // i < n-1
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// func shrVU(z, x []Word, s uint) (c Word)
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TEXT ·shrVU(SB),NOSPLIT,$0
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MOVD z_len+8(FP), R5
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MOVD $0, R0
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SUB $1, R5 // n--
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BLT X9b // n < 0 (n <= 0)
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@ -110,22 +110,22 @@ nocgo:
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MOVD $runtime·mainPC(SB), R2 // entry
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SUB $24, R15
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MOVD R2, 16(R15)
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MOVD R0, 8(R15)
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MOVD R0, 0(R15)
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MOVD $0, 8(R15)
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MOVD $0, 0(R15)
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BL runtime·newproc(SB)
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ADD $24, R15
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// start this M
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BL runtime·mstart(SB)
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MOVD R0, 1(R0)
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MOVD $0, 1(R0)
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RET
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DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
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GLOBL runtime·mainPC(SB),RODATA,$8
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TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
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MOVD R0, 2(R0)
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MOVD $0, 2(R0)
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RET
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TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
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@ -175,7 +175,7 @@ TEXT runtime·mcall(SB), NOSPLIT, $-8-8
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// Save caller state in g->sched
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MOVD R15, (g_sched+gobuf_sp)(g)
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MOVD LR, (g_sched+gobuf_pc)(g)
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MOVD R0, (g_sched+gobuf_lr)(g)
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MOVD $0, (g_sched+gobuf_lr)(g)
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MOVD g, (g_sched+gobuf_g)(g)
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// Switch to m->g0 & its stack, call fn.
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@ -232,7 +232,7 @@ switch:
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ADD $16, R6 // get past prologue
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MOVD R6, (g_sched+gobuf_pc)(g)
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MOVD R15, (g_sched+gobuf_sp)(g)
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MOVD R0, (g_sched+gobuf_lr)(g)
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MOVD $0, (g_sched+gobuf_lr)(g)
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MOVD g, (g_sched+gobuf_g)(g)
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// switch to g0
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@ -526,7 +526,7 @@ g0:
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MOVD (g_stack+stack_hi)(R5), R5
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SUB R2, R5
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MOVD R5, 160(R15) // save depth in old g stack (can't just save SP, as stack might be copied during a callback)
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MOVD R0, 0(R15) // clear back chain pointer (TODO can we give it real back trace information?)
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MOVD $0, 0(R15) // clear back chain pointer (TODO can we give it real back trace information?)
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MOVD R4, R2 // arg in R2
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BL R3 // can clobber: R0-R5, R14, F0-F3, F5, F7-F15
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@ -16,8 +16,8 @@ start:
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CMPBLE R5, $15, clear12to15
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CMP R5, $32
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BGE clearmt32
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MOVD R0, 0(R4)
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MOVD R0, 8(R4)
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MOVD $0, 0(R4)
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MOVD $0, 8(R4)
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ADD $16, R4
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SUB $16, R5
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BR start
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@ -25,79 +25,79 @@ start:
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clear0to3:
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CMPBEQ R5, $0, done
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CMPBNE R5, $1, clear2
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MOVB R0, 0(R4)
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MOVB $0, 0(R4)
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RET
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clear2:
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CMPBNE R5, $2, clear3
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MOVH R0, 0(R4)
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MOVH $0, 0(R4)
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RET
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clear3:
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MOVH R0, 0(R4)
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MOVB R0, 2(R4)
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MOVH $0, 0(R4)
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MOVB $0, 2(R4)
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RET
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clear4to7:
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CMPBNE R5, $4, clear5
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MOVW R0, 0(R4)
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MOVW $0, 0(R4)
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RET
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clear5:
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CMPBNE R5, $5, clear6
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MOVW R0, 0(R4)
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MOVB R0, 4(R4)
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MOVW $0, 0(R4)
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MOVB $0, 4(R4)
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RET
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clear6:
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CMPBNE R5, $6, clear7
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MOVW R0, 0(R4)
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MOVH R0, 4(R4)
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MOVW $0, 0(R4)
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MOVH $0, 4(R4)
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RET
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clear7:
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MOVW R0, 0(R4)
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MOVH R0, 4(R4)
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MOVB R0, 6(R4)
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MOVW $0, 0(R4)
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MOVH $0, 4(R4)
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MOVB $0, 6(R4)
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RET
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clear8to11:
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CMPBNE R5, $8, clear9
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MOVD R0, 0(R4)
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MOVD $0, 0(R4)
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RET
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clear9:
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CMPBNE R5, $9, clear10
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MOVD R0, 0(R4)
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MOVB R0, 8(R4)
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MOVD $0, 0(R4)
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MOVB $0, 8(R4)
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RET
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clear10:
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CMPBNE R5, $10, clear11
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MOVD R0, 0(R4)
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MOVH R0, 8(R4)
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MOVD $0, 0(R4)
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MOVH $0, 8(R4)
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RET
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clear11:
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MOVD R0, 0(R4)
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MOVH R0, 8(R4)
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MOVB R0, 10(R4)
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MOVD $0, 0(R4)
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MOVH $0, 8(R4)
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MOVB $0, 10(R4)
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RET
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clear12to15:
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CMPBNE R5, $12, clear13
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MOVD R0, 0(R4)
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MOVW R0, 8(R4)
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MOVD $0, 0(R4)
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MOVW $0, 8(R4)
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RET
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clear13:
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CMPBNE R5, $13, clear14
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MOVD R0, 0(R4)
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MOVW R0, 8(R4)
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MOVB R0, 12(R4)
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MOVD $0, 0(R4)
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MOVW $0, 8(R4)
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MOVB $0, 12(R4)
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RET
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clear14:
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CMPBNE R5, $14, clear15
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MOVD R0, 0(R4)
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MOVW R0, 8(R4)
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MOVH R0, 12(R4)
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MOVD $0, 0(R4)
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MOVW $0, 8(R4)
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MOVH $0, 12(R4)
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RET
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clear15:
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MOVD R0, 0(R4)
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MOVW R0, 8(R4)
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MOVH R0, 12(R4)
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MOVB R0, 14(R4)
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MOVD $0, 0(R4)
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MOVW $0, 8(R4)
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MOVH $0, 12(R4)
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MOVB $0, 14(R4)
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RET
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clearmt32:
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@ -117,6 +117,6 @@ done:
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// DO NOT CALL - target for exrl (execute relative long) instruction.
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TEXT runtime·memclr_s390x_exrl_xc(SB),NOSPLIT|NOFRAME,$0-0
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XC $1, 0(R4), 0(R4)
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MOVD R0, 0(R0)
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MOVD $0, 0(R0)
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RET
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