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The ``disable_tail_calls`` attribute instructs the backend to not
perform tail call optimization inside the marked function.
For example,
int callee(int);
int foo(int a) __attribute__((disable_tail_calls)) {
return callee(a); // This call is not tail-call optimized.
}
Note that this attribute is different from 'not_tail_called', which
prevents tail-call optimization to the marked function.
rdar://problem/8973573
Differential Revision: http://reviews.llvm.org/D12547
llvm-svn: 252986
20 lines
773 B
C
20 lines
773 B
C
// RUN: %clang_cc1 -triple x86_64-apple-macosx10.7.0 %s -emit-llvm -mdisable-tail-calls -o - | FileCheck %s -check-prefix=DISABLE
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// RUN: %clang_cc1 -triple x86_64-apple-macosx10.7.0 %s -emit-llvm -o - | FileCheck %s -check-prefix=ENABLE
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// DISABLE: define i32 @f1() [[ATTRTRUE:#[0-9]+]] {
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// DISABLE: define i32 @f2() [[ATTRTRUE]] {
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// ENABLE: define i32 @f1() [[ATTRFALSE:#[0-9]+]] {
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// ENABLE: define i32 @f2() [[ATTRTRUE:#[0-9]+]] {
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int f1() {
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return 0;
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}
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int f2() __attribute__((disable_tail_calls)) {
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return 0;
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}
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// DISABLE: attributes [[ATTRTRUE]] = { {{.*}}"disable-tail-calls"="true"{{.*}} }
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// ENABLE: attributes [[ATTRFALSE]] = { {{.*}}"disable-tail-calls"="false"{{.*}} }
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// ENABLE: attributes [[ATTRTRUE]] = { {{.*}}"disable-tail-calls"="true"{{.*}} }
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