73 lines
1.5 KiB
Plaintext
73 lines
1.5 KiB
Plaintext
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#mach: crisv32
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#output: Basic clock cycles, total @: 54\n
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#output: Memory source stall cycles: 0\n
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#output: Memory read-after-write stall cycles: 0\n
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#output: Movem source stall cycles: 0\n
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#output: Movem destination stall cycles: 0\n
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#output: Movem address stall cycles: 0\n
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#output: Multiplication source stall cycles: 0\n
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#output: Jump source stall cycles: 0\n
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#output: Branch misprediction stall cycles: 18\n
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#output: Jump target stall cycles: 0\n
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#sim: --cris-cycles=basic
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; Check branch penalties. It is assumed that the taken-counters
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; in the bimodal branch-predictors start at 0, meaning two taken
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; branches are required for a branch to be predicted as taken
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; for each counter, from reset. None of these branches go
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; to the end of a cache-line and none map to the same counter.
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.include "testutils.inc"
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startnostack
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ba 0f ; No penalty: always-taken condition not "predicted".
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nop
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nop
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0:
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setf c
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bcs 0f ; Penalty 2 cycles.
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nop
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nop
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0:
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clearf c
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bcc 0f ; Penalty 2 cycles, though branch is a nop.
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moveq 4,r0 ; Execute 5 times:
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0:
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move.d r0,r0
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bne 0b ; Mispredicted 3 out of 5 times: penalty 3*2 cycles.
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subq 1,r0
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0:
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beq 0f ; Not taken; no penalty.
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nop
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nop
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0:
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; (Almost) same insns, but with 16-bit bCC insns.
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ba 0f ; No penalty: always-taken condition not "predicted".
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nop
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.space 520
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0:
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setf c
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bcs 0f ; Penalty 2 cycles.
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nop
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.space 520
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0:
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moveq 4,r0 ; Execute 5 times:
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0:
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ba 1f
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move.d r0,r0 ; Mispredicted 3 out of 5 times:
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.space 520
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1:
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bne 0b ; Penalty 3*2 cycles.
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subq 1,r0
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beq 0f ; Not taken; no penalty.
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nop
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0:
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break 15
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