; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -S -simplifycfg < %s | FileCheck %s declare void @llvm.experimental.guard(i1, ...) define i32 @f_0(i1 %c) { ; CHECK-LABEL: @f_0( ; CHECK-NEXT: entry: ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] ; CHECK-NEXT: unreachable ; entry: call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] ret i32 10 } define i32 @f_1(i1 %c) { ; Demonstrate that we (intentionally) do not simplify a guard on undef ; CHECK-LABEL: @f_1( ; CHECK-NEXT: entry: ; CHECK-NEXT: br i1 [[C:%.*]], label [[TRUE:%.*]], label [[FALSE:%.*]] ; CHECK: true: ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 undef) [ "deopt"() ] ; CHECK-NEXT: ret i32 10 ; CHECK: false: ; CHECK-NEXT: ret i32 20 ; entry: br i1 %c, label %true, label %false true: call void(i1, ...) @llvm.experimental.guard(i1 undef) [ "deopt"() ] ret i32 10 false: ret i32 20 } define i32 @f_2(i1 %c, i32* %buf) { ; CHECK-LABEL: @f_2( ; CHECK-NEXT: entry: ; CHECK-NEXT: br i1 [[C:%.*]], label [[GUARD_BLOCK:%.*]], label [[MERGE_BLOCK:%.*]] ; CHECK: guard_block: ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] ; CHECK-NEXT: unreachable ; CHECK: merge_block: ; CHECK-NEXT: ret i32 50 ; entry: br i1 %c, label %guard_block, label %merge_block guard_block: call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] %val = load i32, i32* %buf br label %merge_block merge_block: %to.return = phi i32 [ %val, %guard_block ], [ 50, %entry ] ret i32 %to.return } define i32 @f_3(i1* %c, i32* %buf) { ; CHECK-LABEL: @f_3( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[C0:%.*]] = load volatile i1, i1* [[C:%.*]] ; CHECK-NEXT: br i1 [[C0]], label [[GUARD_BLOCK:%.*]], label [[MERGE_BLOCK:%.*]] ; CHECK: guard_block: ; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] ; CHECK-NEXT: unreachable ; CHECK: merge_block: ; CHECK-NEXT: [[C1:%.*]] = load volatile i1, i1* [[C]] ; CHECK-NEXT: [[DOT:%.*]] = select i1 [[C1]], i32 50, i32 100 ; CHECK-NEXT: ret i32 [[DOT]] ; entry: %c0 = load volatile i1, i1* %c br i1 %c0, label %guard_block, label %merge_block guard_block: call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] %val = load i32, i32* %buf %c2 = load volatile i1, i1* %c br i1 %c2, label %left, label %right merge_block: %c1 = load volatile i1, i1* %c br i1 %c1, label %left, label %right left: %val.left = phi i32 [ %val, %guard_block ], [ 50, %merge_block ] ret i32 %val.left right: %val.right = phi i32 [ %val, %guard_block ], [ 100, %merge_block ] ret i32 %val.right }