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| author | Carlo Zancanaro <carlo@pc-4w14-0.cs.usyd.edu.au> | 2012-10-15 17:10:06 +1100 |
|---|---|---|
| committer | Carlo Zancanaro <carlo@pc-4w14-0.cs.usyd.edu.au> | 2012-10-15 17:10:06 +1100 |
| commit | be1de4be954c80875ad4108e0a33e8e131b2f2c0 (patch) | |
| tree | 1fbbecf276bf7c7bdcbb4dd446099d6d90eaa516 /clang/test/CodeGen/assign.c | |
| parent | c4626a62754862d20b41e8a46a3574264ea80e6d (diff) | |
| parent | f1bd2e48c5324d3f7cda4090c87f8a5b6f463ce2 (diff) | |
Merge branch 'master' of ssh://bitbucket.org/czan/honours
Diffstat (limited to 'clang/test/CodeGen/assign.c')
| -rw-r--r-- | clang/test/CodeGen/assign.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/clang/test/CodeGen/assign.c b/clang/test/CodeGen/assign.c new file mode 100644 index 0000000..fc00896 --- /dev/null +++ b/clang/test/CodeGen/assign.c @@ -0,0 +1,32 @@ +// RUN: %clang_cc1 -triple x86_64 -emit-llvm -o - %s | FileCheck %s + +// Check that we don't generate unnecessary reloads. +// +// CHECK: define void @f0() +// CHECK: [[x_0:%.*]] = alloca i32, align 4 +// CHECK-NEXT: [[y_0:%.*]] = alloca i32, align 4 +// CHECK-NEXT: store i32 1, i32* [[x_0]] +// CHECK-NEXT: store i32 1, i32* [[x_0]] +// CHECK-NEXT: store i32 1, i32* [[y_0]] +// CHECK: } +void f0() { + int x, y; + x = 1; + y = (x = 1); +} + +// This used to test that we generate reloads for volatile access, +// but that does not appear to be correct behavior for C. +// +// CHECK: define void @f1() +// CHECK: [[x_1:%.*]] = alloca i32, align 4 +// CHECK-NEXT: [[y_1:%.*]] = alloca i32, align 4 +// CHECK-NEXT: store volatile i32 1, i32* [[x_1]] +// CHECK-NEXT: store volatile i32 1, i32* [[x_1]] +// CHECK-NEXT: store volatile i32 1, i32* [[y_1]] +// CHECK: } +void f1() { + volatile int x, y; + x = 1; + y = (x = 1); +} |