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[llvm-mca] Add a -mattr flag

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This adds a -mattr flag to llvm-mca, for cases where the -mcpu option does not
contain all optional features.

Differential Revision: https://reviews.llvm.org/D68190

llvm-svn: 373358
This commit is contained in:
David Green 2019-10-01 17:41:38 +00:00
parent 60bb1d584e
commit 3bac3332a1
2 changed files with 35 additions and 1 deletions
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29
test/tools/llvm-mca/ARM/m4-targetfeatures.s Normal file
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@ -0,0 +1,29 @@
# NOTE: Assertions have been autogenerated by utils/update_mca_test_checks.py
# RUN: llvm-mca -mtriple=arm-none-none-eabi -mcpu=cortex-m4 -mattr=+fp64 -instruction-tables < %s | FileCheck %s
vadd.f32 s0, s2, s2
vadd.f64 d0, d2, d2
# CHECK: Instruction Info:
# CHECK-NEXT: [1]: #uOps
# CHECK-NEXT: [2]: Latency
# CHECK-NEXT: [3]: RThroughput
# CHECK-NEXT: [4]: MayLoad
# CHECK-NEXT: [5]: MayStore
# CHECK-NEXT: [6]: HasSideEffects (U)
# CHECK: [1] [2] [3] [4] [5] [6] Instructions:
# CHECK-NEXT: 1 1 1.00 vadd.f32 s0, s2, s2
# CHECK-NEXT: 1 1 1.00 vadd.f64 d0, d2, d2
# CHECK: Resources:
# CHECK-NEXT: [0] - M4Unit
# CHECK: Resource pressure per iteration:
# CHECK-NEXT: [0]
# CHECK-NEXT: 2.00
# CHECK: Resource pressure by instruction:
# CHECK-NEXT: [0] Instructions:
# CHECK-NEXT: 1.00 vadd.f32 s0, s2, s2
# CHECK-NEXT: 1.00 vadd.f64 d0, d2, d2

7
tools/llvm-mca/llvm-mca.cpp
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@ -89,6 +89,11 @@ static cl::opt<std::string>
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
cl::value_desc("cpu-name"), cl::cat(ToolOptions), cl::init("native"));
static cl::opt<std::string>
MATTR("mattr",
cl::desc("Additional target features."),
cl::cat(ToolOptions));
static cl::opt<int>
OutputAsmVariant("output-asm-variant",
cl::desc("Syntax variant to use for output printing"),
@ -322,7 +327,7 @@ int main(int argc, char **argv) {
MCPU = llvm::sys::getHostCPUName();
std::unique_ptr<MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, /* FeaturesStr */ ""));
TheTarget->createMCSubtargetInfo(TripleName, MCPU, MATTR));
if (!STI->isCPUStringValid(MCPU))
return 1;