24.22.4.8.6. gem5 event queue DerivO3CPU syscall emulation freestanding example analysis: stall_hazard4
Like gem5 event queue DerivO3CPU syscall emulation freestanding example analysis: stall_gain but now with some dependencies after the LDR: userland/arch/aarch64/freestanding/linux/stall_hazard4.S.
So in this case the ic of dependencies like add x6, x5, #1 have to wait until the LDR is finished:
// f = fetch, d = decode, n = rename, p = dispatch, i = issue, c = complete, r = retire
timeline tick pc.upc disasm seq_num
[.ic.r........................................................................fdn]-( 40000) 0x004000b0.0 movz x0, #0, #0 [ 1]
[.ic.r........................................................................fdn]-( 40000) 0x004000b4.0 movz x1, #1, #0 [ 2]
[.ic.r........................................................................fdn]-( 40000) 0x004000b8.0 movz x2, #4, #0 [ 3]
[.ic.r........................................................................fdn]-( 40000) 0x004000bc.0 movz x3, #5, #0 [ 4]
[....................fdn.ic.r....................................................]-( 120000) 0x004000c0.0 adr x4, #65772 [ 5]
[....................fdn.pic.....................................................]-( 120000) 0x004000c4.0 ldr x5, [x4] [ 6]
[........................................................r.......................]-( 160000) ...
[....................fdn.p.......................................................]-( 120000) 0x004000c8.0 add x6, x5, #1 [ 7]
[......................................................ic.r......................]-( 160000) ...
[....................fdn.p.......................................................]-( 120000) 0x004000cc.0 add x7, x6, #1 [ 8]
[.......................................................ic.r.....................]-( 160000) ...
[....................fdn.p.......................................................]-( 120000) 0x004000d0.0 add x8, x7, #1 [ 9]
[........................................................ic.r....................]-( 160000) ...
[....................fdn.p.......................................................]-( 120000) 0x004000d4.0 add x9, x8, #1 [ 10]
[.........................................................ic.r...................]-( 160000) ...
[....................fdn.ic......................................................]-( 120000) 0x004000d8.0 movz x10, #10, #0 [ 11]
[............................................................r...................]-( 160000) ...
[....................fdn.ic......................................................]-( 120000) 0x004000dc.0 movz x11, #11, #0 [ 12]
[............................................................r...................]-( 160000) ...
[.....................fdn.ic.....................................................]-( 120000) 0x004000e0.0 movz x12, #12, #0 [ 13]
[............................................................r...................]-( 160000) ...
[.....................fdn.ic.....................................................]-( 120000) 0x004000e4.0 movz x13, #13, #0 [ 14]
[............................................................r...................]-( 160000) ...
[.....................fdn.ic.....................................................]-( 120000) 0x004000e8.0 movz x14, #14, #0 [ 15]
[............................................................r...................]-( 160000) ...
[.....................fdn.ic.....................................................]-( 120000) 0x004000ec.0 movz x15, #15, #0 [ 16]
[............................................................r...................]-( 160000) ...
[.....................fdn.ic.....................................................]-( 120000) 0x004000f0.0 movz x16, #16, #0 [ 17]
[............................................................r...................]-( 160000) ...
[.....................fdn.ic.....................................................]-( 120000) 0x004000f4.0 movz x17, #17, #0 [ 18]
[.............................................................r..................]-( 160000) ...
[.....................fdn.pic....................................................]-( 120000) 0x004000f8.0 movz x18, #18, #0 [ 19]
[.............................................................r..................]-( 160000) ...
[.....................fdn.pic....................................................]-( 120000) 0x004000fc.0 movz x19, #19, #0 [ 20]
[.............................................................r..................]-( 160000) ...
[............................................fdn.ic...........r..................]-( 160000) 0x00400100.0 movz x20, #20, #0 [ 21]
[............................................fdn.ic...........r..................]-( 160000) 0x00400104.0 movz x21, #21, #0 [ 22]
[............................................fdn.ic...........r..................]-( 160000) 0x00400108.0 movz x22, #22, #0 [ 23]
[............................................fdn.ic...........r..................]-( 160000) 0x0040010c.0 movz x23, #23, #0 [ 24]
[............................................fdn.ic...........r..................]-( 160000) 0x00400110.0 movz x24, #24, #0 [ 25]
[............................................fdn.ic............r.................]-( 160000) 0x00400114.0 movz x25, #25, #0 [ 26]
[............................................fdn.pic...........r.................]-( 160000) 0x00400118.0 movz x26, #26, #0 [ 27]
[............................................fdn.pic...........r.................]-( 160000) 0x0040011c.0 movz x27, #27, #0 [ 28]
[.............................................fdn.ic...........r.................]-( 160000) 0x00400120.0 movz x28, #28, #0 [ 29]
[.............................................fdn.ic...........r.................]-( 160000) 0x00400124.0 movz x29, #29, #0 [ 30]
[.............................................fdn.ic...........r.................]-( 160000) 0x00400128.0 movz x0, #0, #0 [ 31]
[.............................................fdn.ic...........r.................]-( 160000) 0x0040012c.0 movz x1, #1, #0 [ 32]
[.............................................fdn.pic..........r.................]-( 160000) 0x00400130.0 movz x2, #2, #0 [ 33]
[.............................................fdn.pic...........r................]-( 160000) 0x00400134.0 movz x3, #3, #0 [ 34]
[.............................................fdn.pic...........r................]-( 160000) 0x00400138.0 movz x4, #4, #0 [ 35]
[.............................................fdn.pic...........r................]-( 160000) 0x0040013c.0 movz x5, #5, #0 [ 36]