ac73b73c16
Since C++11, the C++ standard has a forward progress guarantee [intro.progress], so all such functions must have the `mustprogress` requirement. In addition, from C11 and onwards, loops without a non-zero constant conditional or no conditional are also required to make progress (C11 6.8.5p6). This patch implements these attribute deductions so they can be used by the optimization passes. Differential Revision: https://reviews.llvm.org/D86841
184 lines
5.3 KiB
C++
184 lines
5.3 KiB
C++
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --check-attributes
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// RUN: %clang_cc1 -std=c++98 -triple=x86_64-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck %s
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int a = 0;
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int b = 0;
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z2f1v(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[FOR_COND:%.*]]
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// CHECK: for.cond:
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// CHECK-NEXT: br i1 true, label [[FOR_BODY:%.*]], label [[FOR_END:%.*]]
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// CHECK: for.body:
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// CHECK-NEXT: br label [[FOR_COND]]
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// CHECK: for.end:
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// CHECK-NEXT: ret void
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//
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void f1() {
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for (; 1;) {
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}
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z2f2v(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[FOR_COND:%.*]]
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// CHECK: for.cond:
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @b, align 4
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// CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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// CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[FOR_END:%.*]]
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// CHECK: for.body:
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// CHECK-NEXT: br label [[FOR_COND]]
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// CHECK: for.end:
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// CHECK-NEXT: ret void
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//
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void f2() {
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for (; a == b;) {
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}
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z1Fv(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[FOR_COND:%.*]]
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// CHECK: for.cond:
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// CHECK-NEXT: br i1 true, label [[FOR_BODY:%.*]], label [[FOR_END:%.*]]
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// CHECK: for.body:
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// CHECK-NEXT: br label [[FOR_COND]]
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// CHECK: for.end:
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// CHECK-NEXT: br label [[FOR_COND1:%.*]]
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// CHECK: for.cond1:
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @b, align 4
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// CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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// CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY2:%.*]], label [[FOR_END3:%.*]]
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// CHECK: for.body2:
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// CHECK-NEXT: br label [[FOR_COND1]]
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// CHECK: for.end3:
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// CHECK-NEXT: ret void
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//
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void F() {
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for (; 1;) {
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}
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for (; a == b;) {
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}
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z2w1v(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[WHILE_BODY:%.*]]
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// CHECK: while.body:
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// CHECK-NEXT: br label [[WHILE_BODY]]
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//
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void w1() {
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while (1) {
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}
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z2w2v(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[WHILE_COND:%.*]]
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// CHECK: while.cond:
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @b, align 4
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// CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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// CHECK-NEXT: br i1 [[CMP]], label [[WHILE_BODY:%.*]], label [[WHILE_END:%.*]]
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// CHECK: while.body:
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// CHECK-NEXT: br label [[WHILE_COND]]
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// CHECK: while.end:
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// CHECK-NEXT: ret void
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//
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void w2() {
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while (a == b) {
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}
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z1Wv(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[WHILE_COND:%.*]]
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// CHECK: while.cond:
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @b, align 4
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// CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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// CHECK-NEXT: br i1 [[CMP]], label [[WHILE_BODY:%.*]], label [[WHILE_END:%.*]]
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// CHECK: while.body:
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// CHECK-NEXT: br label [[WHILE_COND]]
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// CHECK: while.end:
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// CHECK-NEXT: br label [[WHILE_BODY2:%.*]]
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// CHECK: while.body2:
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// CHECK-NEXT: br label [[WHILE_BODY2]]
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//
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void W() {
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while (a == b) {
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}
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while (1) {
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}
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z2d1v(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[DO_BODY:%.*]]
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// CHECK: do.body:
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// CHECK-NEXT: br label [[DO_COND:%.*]]
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// CHECK: do.cond:
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// CHECK-NEXT: br i1 true, label [[DO_BODY]], label [[DO_END:%.*]]
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// CHECK: do.end:
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// CHECK-NEXT: ret void
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//
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void d1() {
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do {
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} while (1);
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z2d2v(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[DO_BODY:%.*]]
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// CHECK: do.body:
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// CHECK-NEXT: br label [[DO_COND:%.*]]
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// CHECK: do.cond:
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @b, align 4
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// CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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// CHECK-NEXT: br i1 [[CMP]], label [[DO_BODY]], label [[DO_END:%.*]]
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// CHECK: do.end:
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// CHECK-NEXT: ret void
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//
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void d2() {
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do {
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} while (a == b);
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}
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// CHECK: Function Attrs: noinline nounwind optnone
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// CHECK-LABEL: @_Z1Dv(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: br label [[DO_BODY:%.*]]
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// CHECK: do.body:
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// CHECK-NEXT: br label [[DO_COND:%.*]]
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// CHECK: do.cond:
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// CHECK-NEXT: br i1 true, label [[DO_BODY]], label [[DO_END:%.*]]
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// CHECK: do.end:
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// CHECK-NEXT: br label [[DO_BODY1:%.*]]
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// CHECK: do.body1:
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// CHECK-NEXT: br label [[DO_COND2:%.*]]
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// CHECK: do.cond2:
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// CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @b, align 4
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// CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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// CHECK-NEXT: br i1 [[CMP]], label [[DO_BODY1]], label [[DO_END3:%.*]]
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// CHECK: do.end3:
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// CHECK-NEXT: ret void
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//
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void D() {
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do {
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} while (1);
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do {
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} while (a == b);
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}
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