37 lines · c
1// RUN: %clang_cc1 -triple x86_64-linux-gnu -gkey-instructions -x c++ -std=c++17 %s -debug-info-kind=line-tables-only -emit-llvm -o - \2// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank3 4// RUN: %clang_cc1 -triple x86_64-linux-gnu -gkey-instructions -x c %s -debug-info-kind=line-tables-only -emit-llvm -o - \5// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank6 7// Perennial question: should the `dec` be in its own source atom or not8// (currently it is).9 10// Another question - we've made the cmp and br separate source atoms for11// now, to match existing behaviour in this case:12// 1. do {13// 2. something();14// 3. }15// 4. while (--A);16// Non key instruction behaviour is: 2, 4[, 3, 2, 4]+17// The cond br is associated with the brace on line 3 and the cmp is line 4;18// if they were in the same atom group we'd step just: 2, 3[, 2, 3]+19// FIXME: We could arguably improve the behaviour by making them the same20// group but having the cmp higher precedence, resulting in: 2, 4[, 2, 4]+.21 22void a(int A) {23// CHECK: %dec = add nsw i32 %0, -1, !dbg [[G1R2:!.*]]24// CHECK: store i32 %dec, ptr %A.addr{{.*}}, !dbg [[G1R1:!.*]]25// CHECK: %tobool = icmp ne i32 %dec, 0, !dbg [[G2R1:!.*]]26// CHECK: br i1 %tobool, label %do.body, label %do.end, !dbg [[G3R1:!.*]], !llvm.loop27 do { } while (--A);28 29// CHECK: ret{{.*}}, !dbg [[RET:!.*]]30}31 32// CHECK: [[G1R2]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 2)33// CHECK: [[G1R1]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 1)34// CHECK: [[G2R1]] = !DILocation({{.*}}, atomGroup: 2, atomRank: 1)35// CHECK: [[G3R1]] = !DILocation({{.*}}, atomGroup: 3, atomRank: 1)36// CHECK: [[RET]] = !DILocation({{.*}}, atomGroup: 4, atomRank: 1)37