Displaying 2 results from an estimated 2 matches for "livethru".
2015 Mar 27
2
[LLVMdev] Question about load clustering in the machine scheduler
...There is 1 load unit
that can hold up to 31 loads waiting to be executed, but only 1 load
can be executed at a time.
Pick Top CLUSTER
Scheduling SU(43) %vreg46<def> = S_BUFFER_LOAD_DWORD_IMM %vreg9, 48; mem:LD4[<unknown>] SGPR_32:%vreg46 SReg_128:%vreg9
SReg_32: 45 > 44(+ 0 livethru)
VS_32: 51 > 18(+ 0 livethru)
Ready @46c
HWLGKM +1x105u
TopQ.A BotLatency SU(43) 78c
*** Max MOps 1 at cycle 46
Cycle: 47 TopQ.A
TopQ.A @47c
Retired: 47
Executed: 47c
Critical: 47c, 47 MOps
ExpectedLatency: 10c
- Latency limited.
BotQ.A RemLatency SU(1698) 99c
TopQ.A + Rema...
2015 Mar 27
2
[LLVMdev] Question about load clustering in the machine scheduler
Hi,
I have a program with over 100 loads (each with a 10 cycle latency)
at the beginning of the program, and I can't figure out how to get
the machine scheduler to intermix ALU instructions with the loads to
effectively hide the latency.
It seems the issue is with load clustering. I restrict load clustering
to 4 at a time, but when I look at the debug output, the loads are
always being