Optimise code a little.

diff --git a/sysdeps/unix/sysv/linux/arm/mmap64.S b/sysdeps/unix/sysv/linux/arm/mmap64.S
index 3936e25..f8361b5 100644 (file)
--- a/sysdeps/unix/sysv/linux/arm/mmap64.S
+++ b/sysdeps/unix/sysv/linux/arm/mmap64.S
@@ -27,38 +27,44 @@
        .text
 ENTRY (__mmap64)
 #ifdef __NR_mmap2
-       stmfd   sp!, {r4, r5, lr}
-       ldr     r5, [sp, $16]
-       ldr     r4, [sp, $12]
-       movs    ip, r5, lsl $20         @ check that offset is page-aligned
+       ldr     ip, [sp, $4]            @ offset low part
+       str     r5, [sp, #-4]!
+       ldr     r5, [sp, $12]           @ offset high part
+       str     r4, [sp, #-4]!
+       movs    r4, ip, lsl $20         @ check that offset is page-aligned
+       mov     ip, ip, lsr $12
+       moveqs  r4, r5, lsr $12         @ check for overflow
        bne     .Linval
-       ldr     ip, [sp, $20]
-       mov     r5, r5, lsr $12
-       orr     r5, r5, ip, lsl $20     @ compose page offset
-       movs    ip, ip, lsr $12
-       bne     .Linval                 @ check for overflow
+       ldr     r4, [sp, $8]            @ load fd
+       orr     r5, ip, r5, lsl $20     @ compose page offset
        mov     ip, r0
        swi     SYS_ify (mmap2)
        cmn     r0, $4096
-       LOADREGS(ccfd, sp!, {r4, r5, pc})
 # ifdef __ASSUME_MMAP2_SYSCALL
-       ldmfd   sp!, {r4, r5, lr}
+       ldr     r4, [sp], #4
+       ldr     r5, [sp], #4
+       RETINSTR(movcc, pc, lr) 
        b       PLTJMP(syscall_error)
 # else
+       ldrcc   r4, [sp], #4
+       ldrcc   r5, [sp], #4
+       RETINSTR(movcc, pc, lr)
        cmn     r0, $ENOSYS
-       ldmnefd sp!, {r4, r5, lr}
-       bne     PLTJMP(syscall_error)
+       bne     .Lerror
        /* The current kernel does not support mmap2.  Fall back to plain
           mmap if the offset is small enough.  */
-       ldr     r5, [sp, $20]
+       ldr     r5, [sp, $16]
        mov     r0, ip                  @ first arg was clobbered
        teq     r5, $0
-       ldmeqfd sp!, {r4, r5, lr}
+       ldreq   r4, [sp], #4
+       ldreq   r5, [sp], #4
        beq     PLTJMP(__mmap)
 # endif
 .Linval:
        mov     r0, $-EINVAL
-       ldmfd   sp!, {r4, r5, lr}
+.Lerror:
+       ldr     r4, [sp], #4
+       ldr     r5, [sp], #4
        b       PLTJMP(syscall_error)
 #else
        /* The kernel headers do not support mmap2.  Fall back to plain