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
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck %s
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// rdar://7309675
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// PR4678
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namespace test0 {
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// test1 should be compmiled to be a varargs function in the IR even
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// though there is no way to do a va_begin. Otherwise, the optimizer
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// will warn about 'dropped arguments' at the call site.
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// CHECK-LABEL: define{{.*}} i32 @_ZN5test05test1Ez(...)
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int test1(...) {
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return -1;
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}
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// CHECK: call noundef i32 (...) @_ZN5test05test1Ez(i32 noundef 0)
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void test() {
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test1(0);
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}
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}
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namespace test1 {
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struct A {
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int x;
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int y;
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};
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void foo(...);
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void test() {
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A x;
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foo(x);
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}
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// CHECK-LABEL: define{{.*}} void @_ZN5test14testEv()
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// CHECK: [[X:%.*]] = alloca [[A:%.*]], align 4
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// CHECK-NEXT: [[TMP:%.*]] = alloca [[A]], align 4
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// CHECK-NEXT: [[T0:%.*]] = bitcast [[A]]* [[TMP]] to i8*
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// CHECK-NEXT: [[T1:%.*]] = bitcast [[A]]* [[X]] to i8*
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// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 [[T0]], i8* align 4 [[T1]], i64 8, i1 false)
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// CHECK-NEXT: [[T0:%.*]] = bitcast [[A]]* [[TMP]] to i64*
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// CHECK-NEXT: [[T1:%.*]] = load i64, i64* [[T0]], align 4
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// CHECK-NEXT: call void (...) @_ZN5test13fooEz(i64 [[T1]])
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// CHECK-NEXT: ret void
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}
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