| 1 | // RUN: %clang_cc1 -triple x86_64 -emit-llvm -o - %s | FileCheck %s |
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| 2 | |
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| 3 | // Check that we don't generate unnecessary reloads. |
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| 4 | // |
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| 5 | // CHECK-LABEL: define void @f0() |
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| 6 | // CHECK: [[x_0:%.*]] = alloca i32, align 4 |
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| 7 | // CHECK-NEXT: [[y_0:%.*]] = alloca i32, align 4 |
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| 8 | // CHECK-NEXT: store i32 1, i32* [[x_0]] |
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| 9 | // CHECK-NEXT: store i32 1, i32* [[x_0]] |
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| 10 | // CHECK-NEXT: store i32 1, i32* [[y_0]] |
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| 11 | // CHECK: } |
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| 12 | void f0() { |
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| 13 | int x, y; |
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| 14 | x = 1; |
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| 15 | y = (x = 1); |
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| 16 | } |
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| 17 | |
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| 18 | // This used to test that we generate reloads for volatile access, |
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| 19 | // but that does not appear to be correct behavior for C. |
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| 20 | // |
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| 21 | // CHECK-LABEL: define void @f1() |
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| 22 | // CHECK: [[x_1:%.*]] = alloca i32, align 4 |
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| 23 | // CHECK-NEXT: [[y_1:%.*]] = alloca i32, align 4 |
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| 24 | // CHECK-NEXT: store volatile i32 1, i32* [[x_1]] |
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| 25 | // CHECK-NEXT: store volatile i32 1, i32* [[x_1]] |
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| 26 | // CHECK-NEXT: store volatile i32 1, i32* [[y_1]] |
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| 27 | // CHECK: } |
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| 28 | void f1() { |
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| 29 | volatile int x, y; |
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| 30 | x = 1; |
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| 31 | y = (x = 1); |
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| 32 | } |
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| 33 | |
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