1b1c8d83d3
Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions. I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default. Test updates are made as a separate patch: D108453 Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D105169
34 lines
934 B
C
34 lines
934 B
C
// RUN: %clang_cc1 -triple x86_64-apple-macosx10.7.0 %s -emit-llvm -o - | FileCheck %s
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// CHECK: %{{[a-z0-9]+}} = notail call i32 @callee0(i32 noundef %
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// CHECK: %{{[a-z0-9]+}} = notail call i32 @callee1(i32 noundef %
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// Check that indirect calls do not have the notail marker.
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// CHECK: store i32 (i32)* @callee1, i32 (i32)** [[ALLOCA1:%[A-Za-z0-9]+]], align 8
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// CHECK: [[INDIRFUNC:%[0-9]+]] = load i32 (i32)*, i32 (i32)** [[ALLOCA1]], align 8
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// CHECK: %{{[a-z0-9]+}} = call i32 [[INDIRFUNC]](i32 noundef %{{[0-9]+}}
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// CHECK: %{{[a-z0-9]+}} = call i32 @callee2(i32 noundef %
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int callee0(int a) __attribute__((not_tail_called)) {
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return a + 1;
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}
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int callee1(int) __attribute__((not_tail_called));
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int callee2(int);
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typedef int (*FuncTy)(int);
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int foo0(int a) {
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if (a > 1)
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return callee0(a);
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if (a == 1)
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return callee1(a);
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if (a < 0) {
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FuncTy F = callee1;
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return (*F)(a);
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}
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return callee2(a);
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}
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