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003c0b9307
Motivation:
```
int test(int x, int y) {
int r = 0;
[[clang::always_inline]] r += foo(x, y); // force compiler to inline this function here
return r;
}
```
In 2018, @kuhar proposed "Introduce per-callsite inline intrinsics" in https://reviews.llvm.org/D51200 to solve this motivation case (and many others).
This patch solves this problem with call site attribute. "noinline" statement attribute already landed in D119061. Also, some LLVM Inliner fixes landed so call site attribute is stronger than function attribute.
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D120717
42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
// RUN: %clang_cc1 -S -emit-llvm %s -triple x86_64-unknown-linux-gnu -o - | FileCheck %s
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bool bar();
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void f(bool, bool);
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void g(bool);
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void foo(int i) {
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[[clang::always_inline]] bar();
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR:[0-9]+]]
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[[clang::always_inline]] (i = 4, bar());
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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[[clang::always_inline]] (void)(bar());
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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[[clang::always_inline]] f(bar(), bar());
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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// CHECK: call void @_Z1fbb({{.*}}) #[[ALWAYSINLINEATTR]]
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[[clang::always_inline]] for (bar(); bar(); bar()) {}
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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// CHECK: call noundef zeroext i1 @_Z3barv() #[[ALWAYSINLINEATTR]]
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bar();
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// CHECK: call noundef zeroext i1 @_Z3barv()
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[[gnu::always_inline]] bar();
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// CHECK: call noundef zeroext i1 @_Z3barv()
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}
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struct S {
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friend bool operator==(const S &LHS, const S &RHS);
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};
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void func(const S &s1, const S &s2) {
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[[clang::always_inline]]g(s1 == s2);
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// CHECK: call noundef zeroext i1 @_ZeqRK1SS1_({{.*}}) #[[ALWAYSINLINEATTR]]
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// CHECK: call void @_Z1gb({{.*}}) #[[ALWAYSINLINEATTR]]
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bool b;
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[[clang::always_inline]] b = s1 == s2;
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// CHECK: call noundef zeroext i1 @_ZeqRK1SS1_({{.*}}) #[[ALWAYSINLINEATTR]]
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}
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// CHECK: attributes #[[ALWAYSINLINEATTR]] = { alwaysinline }
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