| 1 | // RUN: %clang_cc1 %s -triple x86_64-apple-darwin -emit-llvm -o - | FileCheck %s |
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| 2 | // Exercise various use cases for local asm "register variables". |
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| 3 | |
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| 4 | int foo() { |
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| 5 | // CHECK-LABEL: define i32 @foo() |
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| 6 | // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 |
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| 7 | |
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| 8 | register int a asm("rsi")=5; |
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| 9 | // CHECK: store i32 5, i32* [[A]] |
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| 10 | |
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| 11 | asm volatile("; %0 This asm defines rsi" : "=r"(a)); |
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| 12 | // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"() |
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| 13 | // CHECK: store i32 [[Z]], i32* [[A]] |
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| 14 | |
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| 15 | a = 42; |
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| 16 | // CHECK: store i32 42, i32* [[A]] |
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| 17 | |
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| 18 | asm volatile("; %0 This asm uses rsi" : : "r"(a)); |
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| 19 | // CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
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| 20 | // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) |
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| 21 | |
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| 22 | return a; |
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| 23 | // CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
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| 24 | // CHECK: ret i32 [[TMP1]] |
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| 25 | } |
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| 26 | |
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| 27 | int earlyclobber() { |
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| 28 | // CHECK-LABEL: define i32 @earlyclobber() |
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| 29 | // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 |
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| 30 | |
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| 31 | register int a asm("rsi")=5; |
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| 32 | // CHECK: store i32 5, i32* [[A]] |
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| 33 | |
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| 34 | asm volatile("; %0 This asm defines rsi" : "=&r"(a)); |
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| 35 | // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "=&{rsi},~{dirflag},~{fpsr},~{flags}"() |
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| 36 | // CHECK: store i32 [[Z]], i32* [[A]] |
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| 37 | |
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| 38 | a = 42; |
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| 39 | // CHECK: store i32 42, i32* [[A]] |
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| 40 | |
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| 41 | asm volatile("; %0 This asm uses rsi" : : "r"(a)); |
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| 42 | // CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
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| 43 | // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) |
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| 44 | |
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| 45 | return a; |
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| 46 | // CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
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| 47 | // CHECK: ret i32 [[TMP1]] |
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| 48 | } |
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| 49 | |
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