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[X86] AMD Zen 3: sub-32-bit CMP also break dependencies 

They measure as having the same effect as 32-bit CMP.
This commit is contained in:
Roman Lebedev 2021-05-10 20:52:30 +03:00
parent ecff974b66
commit 08cf2776ac
No known key found for this signature in database
GPG Key ID: 083C3EBB4A1689E0
2 changed files with 36 additions and 32 deletions
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8
llvm/lib/Target/X86/X86ScheduleZnver3.td
View File

@ -1525,7 +1525,9 @@ def Zn3WriteZeroIdiomEFLAGS : SchedWriteVariant<[
SchedVar<MCSchedPredicate<CheckSameRegOperand<0, 1>>, [Zn3WriteZeroLatency]>,
SchedVar<NoSchedPred, [WriteALU]>
]>;
def : InstRW<[Zn3WriteZeroIdiomEFLAGS], (instrs CMP32rr, CMP32rr_REV,
def : InstRW<[Zn3WriteZeroIdiomEFLAGS], (instrs CMP8rr, CMP8rr_REV,
CMP16rr, CMP16rr_REV,
CMP32rr, CMP32rr_REV,
CMP64rr, CMP64rr_REV)>;
def : IsZeroIdiomFunction<[
@ -1540,7 +1542,9 @@ def : IsDepBreakingFunction<[
// GPR
DepBreakingClass<[ SBB32rr, SBB32rr_REV,
SBB64rr, SBB64rr_REV ], ZeroIdiomPredicate>,
DepBreakingClass<[ CMP32rr, CMP32rr_REV,
DepBreakingClass<[ CMP8rr, CMP8rr_REV,
CMP16rr, CMP16rr_REV,
CMP32rr, CMP32rr_REV,
CMP64rr, CMP64rr_REV ], CheckSameRegOperand<0, 1> >,

60
llvm/test/tools/llvm-mca/X86/Znver3/dependency-breaking-gpr.s
View File

@ -359,7 +359,7 @@ cmovael %eax, %ecx
# CHECK: Iterations: 1000
# CHECK-NEXT: Instructions: 3000
# CHECK-NEXT: Total Cycles: 4005
# CHECK-NEXT: Total Cycles: 4004
# CHECK-NEXT: Total uOps: 4000
# CHECK: Dispatch Width: 6
@ -377,7 +377,7 @@ cmovael %eax, %ecx
# CHECK: [1] [2] [3] [4] [5] [6] Instructions:
# CHECK-NEXT: 2 4 1.00 mulxl %eax, %eax, %eax
# CHECK-NEXT: 1 1 0.25 cmpw %ax, %ax
# CHECK-NEXT: 1 0 0.17 cmpw %ax, %ax
# CHECK-NEXT: 1 1 0.50 cmovael %eax, %ecx
# CHECK: Resources:
@ -407,24 +407,24 @@ cmovael %eax, %ecx
# CHECK: Resource pressure per iteration:
# CHECK-NEXT: [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12.0] [12.1] [13] [14.0] [14.1] [14.2] [15.0] [15.1] [15.2] [16.0] [16.1]
# CHECK-NEXT: - - - 0.67 1.00 0.67 0.67 - - - - - - - - - - - - - - - -
# CHECK-NEXT: - - - 0.50 1.00 - 0.50 - - - - - - - - - - - - - - - -
# CHECK: Resource pressure by instruction:
# CHECK-NEXT: [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12.0] [12.1] [13] [14.0] [14.1] [14.2] [15.0] [15.1] [15.2] [16.0] [16.1] Instructions:
# CHECK-NEXT: - - - - 1.00 - - - - - - - - - - - - - - - - - - mulxl %eax, %eax, %eax
# CHECK-NEXT: - - - - - 0.67 0.33 - - - - - - - - - - - - - - - - cmpw %ax, %ax
# CHECK-NEXT: - - - 0.67 - - 0.33 - - - - - - - - - - - - - - - - cmovael %eax, %ecx
# CHECK-NEXT: - - - - - - - - - - - - - - - - - - - - - - - cmpw %ax, %ax
# CHECK-NEXT: - - - 0.50 - - 0.50 - - - - - - - - - - - - - - - - cmovael %eax, %ecx
# CHECK: Timeline view:
# CHECK-NEXT: 012
# CHECK-NEXT: 01
# CHECK-NEXT: Index 0123456789
# CHECK: [0,0] DeeeeER . . mulxl %eax, %eax, %eax
# CHECK-NEXT: [0,1] D====eER . . cmpw %ax, %ax
# CHECK-NEXT: [0,2] D=====eER . . cmovael %eax, %ecx
# CHECK-NEXT: [1,0] D====eeeeER . mulxl %eax, %eax, %eax
# CHECK-NEXT: [1,1] .D=======eER. cmpw %ax, %ax
# CHECK-NEXT: [1,2] .D========eER cmovael %eax, %ecx
# CHECK: [0,0] DeeeeER .. mulxl %eax, %eax, %eax
# CHECK-NEXT: [0,1] D-----R .. cmpw %ax, %ax
# CHECK-NEXT: [0,2] D====eER .. cmovael %eax, %ecx
# CHECK-NEXT: [1,0] D====eeeeER. mulxl %eax, %eax, %eax
# CHECK-NEXT: [1,1] .D--------R. cmpw %ax, %ax
# CHECK-NEXT: [1,2] .D=======eER cmovael %eax, %ecx
# CHECK: Average Wait times (based on the timeline view):
# CHECK-NEXT: [0]: Executions
@ -434,15 +434,15 @@ cmovael %eax, %ecx
# CHECK: [0] [1] [2] [3]
# CHECK-NEXT: 0. 2 3.0 0.5 0.0 mulxl %eax, %eax, %eax
# CHECK-NEXT: 1. 2 6.5 0.0 0.0 cmpw %ax, %ax
# CHECK-NEXT: 2. 2 7.5 0.0 0.0 cmovael %eax, %ecx
# CHECK-NEXT: 2 5.7 0.2 0.0 <total>
# CHECK-NEXT: 1. 2 0.0 0.0 6.5 cmpw %ax, %ax
# CHECK-NEXT: 2. 2 6.5 0.0 0.0 cmovael %eax, %ecx
# CHECK-NEXT: 2 3.2 0.2 2.2 <total>
# CHECK: [5] Code Region
# CHECK: Iterations: 1000
# CHECK-NEXT: Instructions: 3000
# CHECK-NEXT: Total Cycles: 4005
# CHECK-NEXT: Total Cycles: 4004
# CHECK-NEXT: Total uOps: 4000
# CHECK: Dispatch Width: 6
@ -460,7 +460,7 @@ cmovael %eax, %ecx
# CHECK: [1] [2] [3] [4] [5] [6] Instructions:
# CHECK-NEXT: 2 4 1.00 mulxl %eax, %eax, %eax
# CHECK-NEXT: 1 1 0.25 cmpb %al, %al
# CHECK-NEXT: 1 0 0.17 cmpb %al, %al
# CHECK-NEXT: 1 1 0.50 cmovael %eax, %ecx
# CHECK: Resources:
@ -490,24 +490,24 @@ cmovael %eax, %ecx
# CHECK: Resource pressure per iteration:
# CHECK-NEXT: [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12.0] [12.1] [13] [14.0] [14.1] [14.2] [15.0] [15.1] [15.2] [16.0] [16.1]
# CHECK-NEXT: - - - 0.67 1.00 0.67 0.67 - - - - - - - - - - - - - - - -
# CHECK-NEXT: - - - 0.50 1.00 - 0.50 - - - - - - - - - - - - - - - -
# CHECK: Resource pressure by instruction:
# CHECK-NEXT: [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12.0] [12.1] [13] [14.0] [14.1] [14.2] [15.0] [15.1] [15.2] [16.0] [16.1] Instructions:
# CHECK-NEXT: - - - - 1.00 - - - - - - - - - - - - - - - - - - mulxl %eax, %eax, %eax
# CHECK-NEXT: - - - - - 0.67 0.33 - - - - - - - - - - - - - - - - cmpb %al, %al
# CHECK-NEXT: - - - 0.67 - - 0.33 - - - - - - - - - - - - - - - - cmovael %eax, %ecx
# CHECK-NEXT: - - - - - - - - - - - - - - - - - - - - - - - cmpb %al, %al
# CHECK-NEXT: - - - 0.50 - - 0.50 - - - - - - - - - - - - - - - - cmovael %eax, %ecx
# CHECK: Timeline view:
# CHECK-NEXT: 012
# CHECK-NEXT: 01
# CHECK-NEXT: Index 0123456789
# CHECK: [0,0] DeeeeER . . mulxl %eax, %eax, %eax
# CHECK-NEXT: [0,1] D====eER . . cmpb %al, %al
# CHECK-NEXT: [0,2] D=====eER . . cmovael %eax, %ecx
# CHECK-NEXT: [1,0] D====eeeeER . mulxl %eax, %eax, %eax
# CHECK-NEXT: [1,1] .D=======eER. cmpb %al, %al
# CHECK-NEXT: [1,2] .D========eER cmovael %eax, %ecx
# CHECK: [0,0] DeeeeER .. mulxl %eax, %eax, %eax
# CHECK-NEXT: [0,1] D-----R .. cmpb %al, %al
# CHECK-NEXT: [0,2] D====eER .. cmovael %eax, %ecx
# CHECK-NEXT: [1,0] D====eeeeER. mulxl %eax, %eax, %eax
# CHECK-NEXT: [1,1] .D--------R. cmpb %al, %al
# CHECK-NEXT: [1,2] .D=======eER cmovael %eax, %ecx
# CHECK: Average Wait times (based on the timeline view):
# CHECK-NEXT: [0]: Executions
@ -517,6 +517,6 @@ cmovael %eax, %ecx
# CHECK: [0] [1] [2] [3]
# CHECK-NEXT: 0. 2 3.0 0.5 0.0 mulxl %eax, %eax, %eax
# CHECK-NEXT: 1. 2 6.5 0.0 0.0 cmpb %al, %al
# CHECK-NEXT: 2. 2 7.5 0.0 0.0 cmovael %eax, %ecx
# CHECK-NEXT: 2 5.7 0.2 0.0 <total>
# CHECK-NEXT: 1. 2 0.0 0.0 6.5 cmpb %al, %al
# CHECK-NEXT: 2. 2 6.5 0.0 0.0 cmovael %eax, %ecx
# CHECK-NEXT: 2 3.2 0.2 2.2 <total>