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author | Andrew Trick <atrick@apple.com> | 2013-06-15 04:50:02 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2013-06-15 04:50:02 +0000 |
commit | a5ce5f36d3a1e312304e8312ca64a1342f5f55a6 (patch) | |
tree | 48b5f93d3c1ec9781977edafc9a09eb43673b8a9 /lib/Target/X86 | |
parent | b86a0cdb674549d8493043331cecd9cbf53b80da (diff) | |
download | llvm-a5ce5f36d3a1e312304e8312ca64a1342f5f55a6.tar.gz llvm-a5ce5f36d3a1e312304e8312ca64a1342f5f55a6.tar.bz2 llvm-a5ce5f36d3a1e312304e8312ca64a1342f5f55a6.tar.xz |
Update machine models. Specify buffer sizes for OOO processors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184033 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86')
-rw-r--r-- | lib/Target/X86/X86SchedHaswell.td | 2 | ||||
-rw-r--r-- | lib/Target/X86/X86SchedSandyBridge.td | 2 | ||||
-rw-r--r-- | lib/Target/X86/X86Schedule.td | 7 | ||||
-rw-r--r-- | lib/Target/X86/X86ScheduleAtom.td | 3 |
4 files changed, 7 insertions, 7 deletions
diff --git a/lib/Target/X86/X86SchedHaswell.td b/lib/Target/X86/X86SchedHaswell.td index 49e81a7631..f98d0cca67 100644 --- a/lib/Target/X86/X86SchedHaswell.td +++ b/lib/Target/X86/X86SchedHaswell.td @@ -16,7 +16,7 @@ def HaswellModel : SchedMachineModel { // All x86 instructions are modeled as a single micro-op, and HW can decode 4 // instructions per cycle. let IssueWidth = 4; - let MinLatency = 0; // 0 = Out-of-order execution. + let MicroOpBufferSize = 192; // Based on the reorder buffer. let LoadLatency = 4; let MispredictPenalty = 16; } diff --git a/lib/Target/X86/X86SchedSandyBridge.td b/lib/Target/X86/X86SchedSandyBridge.td index c5fa52173b..ecfd3db648 100644 --- a/lib/Target/X86/X86SchedSandyBridge.td +++ b/lib/Target/X86/X86SchedSandyBridge.td @@ -17,7 +17,7 @@ def SandyBridgeModel : SchedMachineModel { // instructions per cycle. // FIXME: Identify instructions that aren't a single fused micro-op. let IssueWidth = 4; - let MinLatency = 0; // 0 = Out-of-order execution. + let MicroOpBufferSize = 168; // Based on the reorder buffer. let LoadLatency = 4; let MispredictPenalty = 16; } diff --git a/lib/Target/X86/X86Schedule.td b/lib/Target/X86/X86Schedule.td index c32d12b184..625a05cb8d 100644 --- a/lib/Target/X86/X86Schedule.td +++ b/lib/Target/X86/X86Schedule.td @@ -550,8 +550,9 @@ def IIC_NOP : InstrItinClass; // Resources beyond the decoder operate on micro-ops and are bufferred // so adjacent micro-ops don't directly compete. // -// MinLatency=0 indicates that RAW dependencies can be decoded in the -// same cycle. +// MicroOpBufferSize > 1 indicates that RAW dependencies can be +// decoded in the same cycle. The value 32 is a reasonably arbitrary +// number of in-flight instructions. // // HighLatency=10 is optimistic. X86InstrInfo::isHighLatencyDef // indicates high latency opcodes. Alternatively, InstrItinData @@ -562,7 +563,7 @@ def IIC_NOP : InstrItinClass; // The GenericModel contains no instruciton itineraries. def GenericModel : SchedMachineModel { let IssueWidth = 4; - let MinLatency = 0; + let MicroOpBufferSize = 32; let LoadLatency = 4; let HighLatency = 10; } diff --git a/lib/Target/X86/X86ScheduleAtom.td b/lib/Target/X86/X86ScheduleAtom.td index 494a690248..14a1471d02 100644 --- a/lib/Target/X86/X86ScheduleAtom.td +++ b/lib/Target/X86/X86ScheduleAtom.td @@ -525,8 +525,7 @@ def AtomItineraries : ProcessorItineraries< // Atom machine model. def AtomModel : SchedMachineModel { let IssueWidth = 2; // Allows 2 instructions per scheduling group. - let MinLatency = 1; // InstrStage cycles overrides MinLatency. - // OperandCycles may be used for expected latency. + let MicroOpBufferSize = 0; // In-order execution, always hide latency. let LoadLatency = 3; // Expected cycles, may be overriden by OperandCycles. let HighLatency = 30;// Expected, may be overriden by OperandCycles. |