; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s define void @assume_false_to_unreachable1() { ; CHECK-LABEL: @assume_false_to_unreachable1( ; CHECK-NEXT: unreachable ; call void @llvm.assume(i1 0) ret void } define void @assume_undef_to_unreachable() { ; CHECK-LABEL: @assume_undef_to_unreachable( ; CHECK-NEXT: unreachable ; call void @llvm.assume(i1 undef) ret void } define i32 @speculate_block_with_assume_basic(i1 %c, i32 %x) { ; CHECK-LABEL: @speculate_block_with_assume_basic( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 1, i32 0 ; CHECK-NEXT: ret i32 [[SPEC_SELECT]] ; entry: br i1 %c, label %if, label %join if: %cmp = icmp ne i32 %x, 0 call void @llvm.assume(i1 %cmp) br label %join join: %phi = phi i32 [ 0, %entry ], [ 1, %if ] ret i32 %phi } define i32 @speculate_block_with_assume_extra_instr(i1 %c, i32 %x) { ; CHECK-LABEL: @speculate_block_with_assume_extra_instr( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[ADD:%.*]] = add i32 [[X:%.*]], 1 ; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 [[ADD]], i32 0 ; CHECK-NEXT: ret i32 [[SPEC_SELECT]] ; entry: br i1 %c, label %if, label %join if: %add = add i32 %x, 1 %cmp = icmp ne i32 %add, 0 call void @llvm.assume(i1 %cmp) br label %join join: %phi = phi i32 [ 0, %entry ], [ %add, %if ] ret i32 %phi } ; We only allow speculating one instruction. Here %add and %add2 are used by ; the assume, but not ephemeral, because they are also used by %phi. define i32 @speculate_block_with_assume_extra_instrs_too_many(i1 %c, i32 %x) { ; CHECK-LABEL: @speculate_block_with_assume_extra_instrs_too_many( ; CHECK-NEXT: entry: ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[JOIN:%.*]] ; CHECK: if: ; CHECK-NEXT: [[ADD:%.*]] = add i32 [[X:%.*]], 1 ; CHECK-NEXT: [[ADD2:%.*]] = add i32 [[ADD]], 1 ; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[ADD2]], 0 ; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]]) ; CHECK-NEXT: br label [[JOIN]] ; CHECK: join: ; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ADD2]], [[IF]] ] ; CHECK-NEXT: ret i32 [[PHI]] ; entry: br i1 %c, label %if, label %join if: %add = add i32 %x, 1 %add2 = add i32 %add, 1 %cmp = icmp ne i32 %add2, 0 call void @llvm.assume(i1 %cmp) br label %join join: %phi = phi i32 [ 0, %entry ], [ %add2, %if ] ret i32 %phi } define i32 @speculate_block_with_assume_extra_instrs_okay(i1 %c, i32 %x) { ; CHECK-LABEL: @speculate_block_with_assume_extra_instrs_okay( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[ADD:%.*]] = add i32 [[X:%.*]], 1 ; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 [[ADD]], i32 0 ; CHECK-NEXT: ret i32 [[SPEC_SELECT]] ; entry: br i1 %c, label %if, label %join if: %add = add i32 %x, 1 %add2 = add i32 %add, 1 %cmp = icmp ne i32 %add2, 0 call void @llvm.assume(i1 %cmp) br label %join join: %phi = phi i32 [ 0, %entry ], [ %add, %if ] ret i32 %phi } define i32 @speculate_block_with_assume_operand_bundle(i1 %c, ptr %p) { ; CHECK-LABEL: @speculate_block_with_assume_operand_bundle( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i32 1, i32 0 ; CHECK-NEXT: ret i32 [[SPEC_SELECT]] ; entry: br i1 %c, label %if, label %join if: call void @llvm.assume(i1 true) ["nonnull"(ptr %p)] br label %join join: %phi = phi i32 [ 0, %entry ], [ 1, %if ] ret i32 %phi } define void @empty_block_with_assume(i1 %c, i32 %x) { ; CHECK-LABEL: @empty_block_with_assume( ; CHECK-NEXT: entry: ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]] ; CHECK: if: ; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[X:%.*]], 0 ; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]]) ; CHECK-NEXT: br label [[JOIN:%.*]] ; CHECK: else: ; CHECK-NEXT: call void @dummy() ; CHECK-NEXT: br label [[JOIN]] ; CHECK: join: ; CHECK-NEXT: ret void ; entry: br i1 %c, label %if, label %else if: %cmp = icmp ne i32 %x, 0 call void @llvm.assume(i1 %cmp) br label %join else: call void @dummy() br label %join join: ret void } define void @not_empty_block_with_assume(i1 %c) { ; CHECK-LABEL: @not_empty_block_with_assume( ; CHECK-NEXT: entry: ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]] ; CHECK: if: ; CHECK-NEXT: [[X:%.*]] = call i32 @may_have_side_effect() ; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[X]], 0 ; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]]) ; CHECK-NEXT: br label [[JOIN:%.*]] ; CHECK: else: ; CHECK-NEXT: call void @dummy() ; CHECK-NEXT: br label [[JOIN]] ; CHECK: join: ; CHECK-NEXT: ret void ; entry: br i1 %c, label %if, label %else if: %x = call i32 @may_have_side_effect() %cmp = icmp ne i32 %x, 0 call void @llvm.assume(i1 %cmp) br label %join else: call void @dummy() br label %join join: ret void } declare void @dummy() declare i32 @may_have_side_effect() declare void @llvm.assume(i1) nounwind