1 //===-- HeatUtils.cpp - Utility for printing heat colors --------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Utility for printing heat colors based on heuristics or profiling
10 // information.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/Analysis/HeatUtils.h"
15 #include "llvm/Analysis/BlockFrequencyInfo.h"
16 #include "llvm/IR/Instructions.h"
17
18 #include <cmath>
19
20 namespace llvm {
21
22 static const unsigned heatSize = 100;
23 static const char heatPalette[heatSize][8] = {
24 "#3d50c3", "#4055c8", "#4358cb", "#465ecf", "#4961d2", "#4c66d6", "#4f69d9",
25 "#536edd", "#5572df", "#5977e3", "#5b7ae5", "#5f7fe8", "#6282ea", "#6687ed",
26 "#6a8bef", "#6c8ff1", "#7093f3", "#7396f5", "#779af7", "#7a9df8", "#7ea1fa",
27 "#81a4fb", "#85a8fc", "#88abfd", "#8caffe", "#8fb1fe", "#93b5fe", "#96b7ff",
28 "#9abbff", "#9ebeff", "#a1c0ff", "#a5c3fe", "#a7c5fe", "#abc8fd", "#aec9fc",
29 "#b2ccfb", "#b5cdfa", "#b9d0f9", "#bbd1f8", "#bfd3f6", "#c1d4f4", "#c5d6f2",
30 "#c7d7f0", "#cbd8ee", "#cedaeb", "#d1dae9", "#d4dbe6", "#d6dce4", "#d9dce1",
31 "#dbdcde", "#dedcdb", "#e0dbd8", "#e3d9d3", "#e5d8d1", "#e8d6cc", "#ead5c9",
32 "#ecd3c5", "#eed0c0", "#efcebd", "#f1ccb8", "#f2cab5", "#f3c7b1", "#f4c5ad",
33 "#f5c1a9", "#f6bfa6", "#f7bca1", "#f7b99e", "#f7b599", "#f7b396", "#f7af91",
34 "#f7ac8e", "#f7a889", "#f6a385", "#f5a081", "#f59c7d", "#f4987a", "#f39475",
35 "#f29072", "#f08b6e", "#ef886b", "#ed8366", "#ec7f63", "#e97a5f", "#e8765c",
36 "#e57058", "#e36c55", "#e16751", "#de614d", "#dc5d4a", "#d85646", "#d65244",
37 "#d24b40", "#d0473d", "#cc403a", "#ca3b37", "#c53334", "#c32e31", "#be242e",
38 "#bb1b2c", "#b70d28"};
39
40 uint64_t
getNumOfCalls(Function & callerFunction,Function & calledFunction)41 getNumOfCalls(Function &callerFunction, Function &calledFunction) {
42 uint64_t counter = 0;
43 for (User *U : calledFunction.users()) {
44 if (auto CI = dyn_cast<CallInst>(U)) {
45 if (CI->getCaller() == (&callerFunction)) {
46 counter += 1;
47 }
48 }
49 }
50 return counter;
51 }
52
getMaxFreq(const Function & F,const BlockFrequencyInfo * BFI)53 uint64_t getMaxFreq(const Function &F, const BlockFrequencyInfo *BFI) {
54 uint64_t maxFreq = 0;
55 for (const BasicBlock &BB : F) {
56 uint64_t freqVal = BFI->getBlockFreq(&BB).getFrequency();
57 if (freqVal >= maxFreq)
58 maxFreq = freqVal;
59 }
60 return maxFreq;
61 }
62
getHeatColor(uint64_t freq,uint64_t maxFreq)63 std::string getHeatColor(uint64_t freq, uint64_t maxFreq) {
64 if (freq > maxFreq)
65 freq = maxFreq;
66 double percent = (freq > 0) ? log2(double(freq)) / log2(maxFreq) : 0;
67 return getHeatColor(percent);
68 }
69
getHeatColor(double percent)70 std::string getHeatColor(double percent) {
71 if (percent > 1.0)
72 percent = 1.0;
73 if (percent < 0.0)
74 percent = 0.0;
75 unsigned colorId = unsigned(round(percent * (heatSize - 1.0)));
76 return heatPalette[colorId];
77 }
78
79 } // namespace llvm
80