1; RUN: llc < %s | FileCheck %s 2 3; Based on this code: 4; 5; extern "C" int array[4]; 6; extern "C" void global_array(int idx1, int idx2, int idx3) { 7; try { 8; array[idx1] = 111; 9; throw; 10; } catch (...) { 11; array[idx2] = 222; 12; } 13; array[idx3] = 333; 14; } 15; extern "C" __declspec(dllimport) int imported; 16; extern "C" void access_imported() { 17; try { 18; imported = 111; 19; throw; 20; } catch (...) { 21; imported = 222; 22; } 23; imported = 333; 24; } 25 26target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" 27target triple = "x86_64-pc-windows-msvc18.0.0" 28 29%eh.ThrowInfo = type { i32, i32, i32, i32 } 30 31@array = external global [4 x i32], align 16 32@imported = external dllimport global i32, align 4 33 34; Function Attrs: uwtable 35define void @global_array(i32 %idx1, i32 %idx2, i32 %idx3) #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) { 36entry: 37 %idxprom = sext i32 %idx1 to i64 38 %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* @array, i64 0, i64 %idxprom 39 store i32 111, i32* %arrayidx, align 4, !tbaa !2 40 invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) #1 41 to label %unreachable unwind label %catch.dispatch 42 43catch.dispatch: ; preds = %entry 44 %cs1 = catchswitch within none [label %catch] unwind to caller 45 46catch: ; preds = %catch.dispatch 47 %0 = catchpad within %cs1 [i8* null, i32 64, i8* null] 48 %idxprom1 = sext i32 %idx2 to i64 49 %arrayidx2 = getelementptr inbounds [4 x i32], [4 x i32]* @array, i64 0, i64 %idxprom1 50 store i32 222, i32* %arrayidx2, align 4, !tbaa !2 51 catchret from %0 to label %try.cont 52 53try.cont: ; preds = %catch 54 %idxprom3 = sext i32 %idx3 to i64 55 %arrayidx4 = getelementptr inbounds [4 x i32], [4 x i32]* @array, i64 0, i64 %idxprom3 56 store i32 333, i32* %arrayidx4, align 4, !tbaa !2 57 ret void 58 59unreachable: ; preds = %entry 60 unreachable 61} 62 63; CHECK-LABEL: global_array: # @global_array 64; CHECK: pushq %rbp 65; First array access 66; CHECK: movslq %ecx, %[[idx:[^ ]*]] 67; CHECK: leaq array(%rip), %[[base:[^ ]*]] 68; CHECK: movl $111, (%[[base]],%[[idx]],4) 69; Might throw an exception and return to below... 70; CHECK: callq _CxxThrowException 71; Third array access must remat the address of array 72; CHECK: movslq {{.*}}, %[[idx:[^ ]*]] 73; CHECK: leaq array(%rip), %[[base:[^ ]*]] 74; CHECK: movl $333, (%[[base]],%[[idx]],4) 75; CHECK: popq %rbp 76; CHECK: retq 77 78; CHECK: "?catch$2@?0?global_array@4HA": 79; CHECK: pushq %rbp 80; CHECK: movslq {{.*}}, %[[idx:[^ ]*]] 81; CHECK: leaq array(%rip), %[[base:[^ ]*]] 82; CHECK: movl $222, (%[[base]],%[[idx]],4) 83; CHECK: popq %rbp 84; CHECK: retq # CATCHRET 85 86declare void @_CxxThrowException(i8*, %eh.ThrowInfo*) 87 88declare i32 @__CxxFrameHandler3(...) 89 90; Function Attrs: uwtable 91define void @access_imported() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) { 92entry: 93 store i32 111, i32* @imported, align 4, !tbaa !2 94 invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) #1 95 to label %unreachable unwind label %catch.dispatch 96 97catch.dispatch: ; preds = %entry 98 %cs1 = catchswitch within none [label %catch] unwind to caller 99 100catch: ; preds = %catch.dispatch 101 %0 = catchpad within %cs1 [i8* null, i32 64, i8* null] 102 store i32 222, i32* @imported, align 4, !tbaa !2 103 catchret from %0 to label %try.cont 104 105try.cont: ; preds = %catch 106 store i32 333, i32* @imported, align 4, !tbaa !2 107 ret void 108 109unreachable: ; preds = %entry 110 unreachable 111} 112 113; CHECK-LABEL: access_imported: # @access_imported 114; CHECK: pushq %rbp 115; CHECK: movq __imp_imported(%rip), %[[base:[^ ]*]] 116; CHECK: movl $111, (%[[base]]) 117; Might throw an exception and return to below... 118; CHECK: callq _CxxThrowException 119; Third access must reload the address of imported 120; CHECK: movq __imp_imported(%rip), %[[base:[^ ]*]] 121; CHECK: movl $333, (%[[base]]) 122; CHECK: popq %rbp 123; CHECK: retq 124 125; CHECK: "?catch$2@?0?access_imported@4HA": 126; CHECK: pushq %rbp 127; CHECK: movq __imp_imported(%rip), %[[base:[^ ]*]] 128; CHECK: movl $222, (%[[base]]) 129; CHECK: popq %rbp 130; CHECK: retq # CATCHRET 131 132 133attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" } 134attributes #1 = { noreturn } 135 136!llvm.module.flags = !{!0} 137!llvm.ident = !{!1} 138 139!0 = !{i32 1, !"PIC Level", i32 2} 140!1 = !{!"clang version 3.8.0 "} 141!2 = !{!3, !3, i64 0} 142!3 = !{!"int", !4, i64 0} 143!4 = !{!"omnipotent char", !5, i64 0} 144!5 = !{!"Simple C/C++ TBAA"} 145