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
23 lines
945 B
C++
23 lines
945 B
C++
// RUN: %clang_cc1 -triple i386-unknown-unknown -fexceptions -emit-llvm %s -o - | FileCheck %s
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int c(void) __attribute__((const));
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int p(void) __attribute__((pure));
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int t(void);
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// CHECK: define{{.*}} i32 @_Z1fv() [[TF:#[0-9]+]] {
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int f(void) {
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// CHECK: call noundef i32 @_Z1cv() [[NUW_RN_CALL:#[0-9]+]]
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// CHECK: call noundef i32 @_Z1pv() [[NUW_RO_CALL:#[0-9]+]]
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return c() + p() + t();
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}
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// CHECK: declare noundef i32 @_Z1cv() [[NUW_RN:#[0-9]+]]
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// CHECK: declare noundef i32 @_Z1pv() [[NUW_RO:#[0-9]+]]
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// CHECK: declare noundef i32 @_Z1tv() [[TF2:#[0-9]+]]
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// CHECK: attributes [[TF]] = { {{.*}} }
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// CHECK: attributes [[NUW_RN]] = { nounwind readnone willreturn{{.*}} }
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// CHECK: attributes [[NUW_RO]] = { nounwind readonly willreturn{{.*}} }
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// CHECK: attributes [[TF2]] = { {{.*}} }
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// CHECK: attributes [[NUW_RN_CALL]] = { nounwind readnone willreturn }
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// CHECK: attributes [[NUW_RO_CALL]] = { nounwind readonly willreturn }
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