forked from OSchip/llvm-project
292 lines
11 KiB
C++
292 lines
11 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks %s -emit-llvm -o - | FileCheck %s -check-prefix=UNINIT
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks -ftrivial-auto-var-init=pattern %s -emit-llvm -o - | FileCheck %s -check-prefix=PATTERN
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks -ftrivial-auto-var-init=zero %s -emit-llvm -o - | FileCheck %s -check-prefix=ZERO
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// None of the synthesized globals should contain `undef`.
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// PATTERN-NOT: undef
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// ZERO-NOT: undef
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template<typename T> void used(T &) noexcept;
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extern "C" {
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// UNINIT-LABEL: test_selfinit(
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// ZERO-LABEL: test_selfinit(
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// ZERO: store i32 0, i32* %self, align 4
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// PATTERN-LABEL: test_selfinit(
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// PATTERN: store i32 -1431655766, i32* %self, align 4
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void test_selfinit() {
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int self = self + 1;
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used(self);
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}
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// UNINIT-LABEL: test_block(
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// ZERO-LABEL: test_block(
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// ZERO: store i32 0, i32* %block
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// PATTERN-LABEL: test_block(
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// PATTERN: store i32 -1431655766, i32* %block
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void test_block() {
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__block int block;
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used(block);
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}
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// Using the variable being initialized is typically UB in C, but for blocks we
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// can be nice: they imply extra book-keeping and we can do the auto-init before
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// any of said book-keeping.
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//
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// UNINIT-LABEL: test_block_self_init(
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// ZERO-LABEL: test_block_self_init(
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// ZERO: %block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>, align 8
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// ZERO: %captured1 = getelementptr inbounds %struct.__block_byref_captured, %struct.__block_byref_captured* %captured, i32 0, i32 4
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// ZERO-NEXT: store %struct.XYZ* null, %struct.XYZ** %captured1, align 8
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// ZERO: %call = call %struct.XYZ* @create(
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// PATTERN-LABEL: test_block_self_init(
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// PATTERN: %block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>, align 8
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// PATTERN: %captured1 = getelementptr inbounds %struct.__block_byref_captured, %struct.__block_byref_captured* %captured, i32 0, i32 4
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// PATTERN-NEXT: store %struct.XYZ* inttoptr (i64 -6148914691236517206 to %struct.XYZ*), %struct.XYZ** %captured1, align 8
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// PATTERN: %call = call %struct.XYZ* @create(
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using Block = void (^)();
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typedef struct XYZ {
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Block block;
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} * xyz_t;
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void test_block_self_init() {
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extern xyz_t create(Block block);
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__block xyz_t captured = create(^() {
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used(captured);
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});
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}
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// Capturing with escape after initialization is also an edge case.
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//
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// UNINIT-LABEL: test_block_captures_self_after_init(
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// ZERO-LABEL: test_block_captures_self_after_init(
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// ZERO: %block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>, align 8
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// ZERO: %captured1 = getelementptr inbounds %struct.__block_byref_captured.1, %struct.__block_byref_captured.1* %captured, i32 0, i32 4
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// ZERO-NEXT: store %struct.XYZ* null, %struct.XYZ** %captured1, align 8
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// ZERO: %call = call %struct.XYZ* @create(
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// PATTERN-LABEL: test_block_captures_self_after_init(
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// PATTERN: %block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>, align 8
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// PATTERN: %captured1 = getelementptr inbounds %struct.__block_byref_captured.1, %struct.__block_byref_captured.1* %captured, i32 0, i32 4
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// PATTERN-NEXT: store %struct.XYZ* inttoptr (i64 -6148914691236517206 to %struct.XYZ*), %struct.XYZ** %captured1, align 8
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// PATTERN: %call = call %struct.XYZ* @create(
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void test_block_captures_self_after_init() {
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extern xyz_t create(Block block);
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__block xyz_t captured;
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captured = create(^() {
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used(captured);
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});
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}
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// This type of code is currently not handled by zero / pattern initialization.
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// The test will break when that is fixed.
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// UNINIT-LABEL: test_goto_unreachable_value(
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// ZERO-LABEL: test_goto_unreachable_value(
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// ZERO-NOT: store {{.*}}%oops
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// PATTERN-LABEL: test_goto_unreachable_value(
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// PATTERN-NOT: store {{.*}}%oops
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void test_goto_unreachable_value() {
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goto jump;
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int oops;
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jump:
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used(oops);
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}
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// This type of code is currently not handled by zero / pattern initialization.
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// The test will break when that is fixed.
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// UNINIT-LABEL: test_goto(
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// ZERO-LABEL: test_goto(
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// ZERO: if.then:
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// ZERO: br label %jump
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// ZERO: store i32 0, i32* %oops, align 4
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// ZERO: br label %jump
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// ZERO: jump:
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// PATTERN-LABEL: test_goto(
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// PATTERN: if.then:
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// PATTERN: br label %jump
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// PATTERN: store i32 -1431655766, i32* %oops, align 4
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// PATTERN: br label %jump
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// PATTERN: jump:
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void test_goto(int i) {
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if (i)
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goto jump;
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int oops;
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jump:
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used(oops);
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}
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// This type of code is currently not handled by zero / pattern initialization.
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// The test will break when that is fixed.
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// UNINIT-LABEL: test_switch(
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// ZERO-LABEL: test_switch(
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// ZERO: sw.bb:
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// ZERO-NEXT: store i32 0, i32* %oops, align 4
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// ZERO: sw.bb1:
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// ZERO-NEXT: call void @{{.*}}used
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// PATTERN-LABEL: test_switch(
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// PATTERN: sw.bb:
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// PATTERN-NEXT: store i32 -1431655766, i32* %oops, align 4
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// PATTERN: sw.bb1:
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// PATTERN-NEXT: call void @{{.*}}used
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void test_switch(int i) {
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switch (i) {
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case 0:
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int oops;
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break;
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case 1:
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used(oops);
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}
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}
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// UNINIT-LABEL: test_vla(
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// ZERO-LABEL: test_vla(
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// ZERO: %[[SIZE:[0-9]+]] = mul nuw i64 %{{.*}}, 4
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// ZERO: call void @llvm.memset{{.*}}(i8* align 16 %{{.*}}, i8 0, i64 %[[SIZE]], i1 false)
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// PATTERN-LABEL: test_vla(
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// PATTERN: %vla.iszerosized = icmp eq i64 %{{.*}}, 0
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// PATTERN: br i1 %vla.iszerosized, label %vla-init.cont, label %vla-setup.loop
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// PATTERN: vla-setup.loop:
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// PATTERN: %[[SIZE:[0-9]+]] = mul nuw i64 %{{.*}}, 4
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// PATTERN: %vla.begin = bitcast i32* %vla to i8*
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// PATTERN: %vla.end = getelementptr inbounds i8, i8* %vla.begin, i64 %[[SIZE]]
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// PATTERN: br label %vla-init.loop
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// PATTERN: vla-init.loop:
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// PATTERN: %vla.cur = phi i8* [ %vla.begin, %vla-setup.loop ], [ %vla.next, %vla-init.loop ]
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// PATTERN: call void @llvm.memcpy{{.*}} %vla.cur, {{.*}}@__const.test_vla.vla
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// PATTERN: %vla.next = getelementptr inbounds i8, i8* %vla.cur, i64 4
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// PATTERN: %vla-init.isdone = icmp eq i8* %vla.next, %vla.end
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// PATTERN: br i1 %vla-init.isdone, label %vla-init.cont, label %vla-init.loop
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// PATTERN: vla-init.cont:
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// PATTERN: call void @{{.*}}used
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void test_vla(int size) {
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// Variable-length arrays can't have a zero size according to C11 6.7.6.2/5.
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// Neither can they be negative-sized.
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//
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// We don't use the former fact because some code creates zero-sized VLAs and
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// doesn't use them. clang makes these share locations with other stack
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// values, which leads to initialization of the wrong values.
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//
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// We rely on the later fact because it generates better code.
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//
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// Both cases are caught by UBSan.
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int vla[size];
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int *ptr = vla;
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used(ptr);
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}
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// UNINIT-LABEL: test_alloca(
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// ZERO-LABEL: test_alloca(
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// ZERO: %[[SIZE:[a-z0-9]+]] = sext i32 %{{.*}} to i64
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// ZERO-NEXT: %[[ALLOCA:[a-z0-9]+]] = alloca i8, i64 %[[SIZE]], align [[ALIGN:[0-9]+]]
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// ZERO-NEXT: call void @llvm.memset{{.*}}(i8* align [[ALIGN]] %[[ALLOCA]], i8 0, i64 %[[SIZE]], i1 false)
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// PATTERN-LABEL: test_alloca(
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// PATTERN: %[[SIZE:[a-z0-9]+]] = sext i32 %{{.*}} to i64
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// PATTERN-NEXT: %[[ALLOCA:[a-z0-9]+]] = alloca i8, i64 %[[SIZE]], align [[ALIGN:[0-9]+]]
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// PATTERN-NEXT: call void @llvm.memset{{.*}}(i8* align [[ALIGN]] %[[ALLOCA]], i8 -86, i64 %[[SIZE]], i1 false)
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void test_alloca(int size) {
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void *ptr = __builtin_alloca(size);
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used(ptr);
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}
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// UNINIT-LABEL: test_alloca_with_align(
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// ZERO-LABEL: test_alloca_with_align(
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// ZERO: %[[SIZE:[a-z0-9]+]] = sext i32 %{{.*}} to i64
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// ZERO-NEXT: %[[ALLOCA:[a-z0-9]+]] = alloca i8, i64 %[[SIZE]], align 128
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// ZERO-NEXT: call void @llvm.memset{{.*}}(i8* align 128 %[[ALLOCA]], i8 0, i64 %[[SIZE]], i1 false)
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// PATTERN-LABEL: test_alloca_with_align(
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// PATTERN: %[[SIZE:[a-z0-9]+]] = sext i32 %{{.*}} to i64
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// PATTERN-NEXT: %[[ALLOCA:[a-z0-9]+]] = alloca i8, i64 %[[SIZE]], align 128
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// PATTERN-NEXT: call void @llvm.memset{{.*}}(i8* align 128 %[[ALLOCA]], i8 -86, i64 %[[SIZE]], i1 false)
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void test_alloca_with_align(int size) {
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void *ptr = __builtin_alloca_with_align(size, 1024);
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used(ptr);
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}
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// UNINIT-LABEL: test_struct_vla(
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// ZERO-LABEL: test_struct_vla(
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// ZERO: %[[SIZE:[0-9]+]] = mul nuw i64 %{{.*}}, 16
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// ZERO: call void @llvm.memset{{.*}}(i8* align 16 %{{.*}}, i8 0, i64 %[[SIZE]], i1 false)
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// PATTERN-LABEL: test_struct_vla(
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// PATTERN: %vla.iszerosized = icmp eq i64 %{{.*}}, 0
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// PATTERN: br i1 %vla.iszerosized, label %vla-init.cont, label %vla-setup.loop
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// PATTERN: vla-setup.loop:
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// PATTERN: %[[SIZE:[0-9]+]] = mul nuw i64 %{{.*}}, 16
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// PATTERN: %vla.begin = bitcast %struct.anon* %vla to i8*
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// PATTERN: %vla.end = getelementptr inbounds i8, i8* %vla.begin, i64 %[[SIZE]]
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// PATTERN: br label %vla-init.loop
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// PATTERN: vla-init.loop:
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// PATTERN: %vla.cur = phi i8* [ %vla.begin, %vla-setup.loop ], [ %vla.next, %vla-init.loop ]
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// PATTERN: call void @llvm.memcpy{{.*}} %vla.cur, {{.*}}@__const.test_struct_vla.vla
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// PATTERN: %vla.next = getelementptr inbounds i8, i8* %vla.cur, i64 16
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// PATTERN: %vla-init.isdone = icmp eq i8* %vla.next, %vla.end
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// PATTERN: br i1 %vla-init.isdone, label %vla-init.cont, label %vla-init.loop
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// PATTERN: vla-init.cont:
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// PATTERN: call void @{{.*}}used
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void test_struct_vla(int size) {
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// Same as above, but with a struct that doesn't just memcpy.
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struct {
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float f;
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char c;
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void *ptr;
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} vla[size];
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void *ptr = static_cast<void*>(vla);
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used(ptr);
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}
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// UNINIT-LABEL: test_zsa(
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// ZERO-LABEL: test_zsa(
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// ZERO: %zsa = alloca [0 x i32], align 4
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// ZERO-NOT: %zsa
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// ZERO: call void @{{.*}}used
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// PATTERN-LABEL: test_zsa(
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// PATTERN: %zsa = alloca [0 x i32], align 4
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// PATTERN-NOT: %zsa
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// PATTERN: call void @{{.*}}used
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void test_zsa(int size) {
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// Technically not valid, but as long as clang accepts them we should do
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// something sensible (i.e. not store to the zero-size array).
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int zsa[0];
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used(zsa);
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}
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// UNINIT-LABEL: test_huge_uninit(
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// ZERO-LABEL: test_huge_uninit(
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// ZERO: call void @llvm.memset{{.*}}, i8 0, i64 65536,
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// PATTERN-LABEL: test_huge_uninit(
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// PATTERN: call void @llvm.memset{{.*}}, i8 -86, i64 65536,
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void test_huge_uninit() {
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// We can't emit this as an inline constant to a store instruction because
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// SDNode hits an internal size limit.
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char big[65536];
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used(big);
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}
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// UNINIT-LABEL: test_huge_small_init(
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// ZERO-LABEL: test_huge_small_init(
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// ZERO: call void @llvm.memset{{.*}}, i8 0, i64 65536,
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// ZERO: store i8 97,
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// ZERO: store i8 98,
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// ZERO: store i8 99,
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// ZERO: store i8 100,
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// PATTERN-LABEL: test_huge_small_init(
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// PATTERN: call void @llvm.memset{{.*}}, i8 0, i64 65536,
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// PATTERN: store i8 97,
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// PATTERN: store i8 98,
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// PATTERN: store i8 99,
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// PATTERN: store i8 100,
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void test_huge_small_init() {
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char big[65536] = { 'a', 'b', 'c', 'd' };
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used(big);
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}
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// UNINIT-LABEL: test_huge_larger_init(
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// ZERO-LABEL: test_huge_larger_init(
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// ZERO: call void @llvm.memcpy{{.*}} @__const.test_huge_larger_init.big, {{.*}}, i64 65536,
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// PATTERN-LABEL: test_huge_larger_init(
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// PATTERN: call void @llvm.memcpy{{.*}} @__const.test_huge_larger_init.big, {{.*}}, i64 65536,
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void test_huge_larger_init() {
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char big[65536] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
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used(big);
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}
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} // extern "C"
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