derek.holloway
7502bf64a4
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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
// RUN: %clang_cc1 %s -triple x86_64-apple-darwin -emit-llvm -o - | FileCheck %s
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// Exercise various use cases for local asm "register variables".
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int foo(void) {
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// CHECK-LABEL: define{{.*}} i32 @foo()
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// CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32
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register int a asm("rsi")=5;
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// CHECK: store i32 5, ptr [[A]]
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asm volatile("; %0 This asm defines rsi" : "=r"(a));
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// CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"()
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// CHECK: store i32 [[Z]], ptr [[A]]
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a = 42;
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// CHECK: store i32 42, ptr [[A]]
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asm volatile("; %0 This asm uses rsi" : : "r"(a));
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// CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, ptr [[A]]
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// CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]])
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return a;
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// CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, ptr [[A]]
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// CHECK: ret i32 [[TMP1]]
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}
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int earlyclobber(void) {
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// CHECK-LABEL: define{{.*}} i32 @earlyclobber()
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// CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32
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register int a asm("rsi")=5;
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// CHECK: store i32 5, ptr [[A]]
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asm volatile("; %0 This asm defines rsi" : "=&r"(a));
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// CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "=&{rsi},~{dirflag},~{fpsr},~{flags}"()
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// CHECK: store i32 [[Z]], ptr [[A]]
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a = 42;
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// CHECK: store i32 42, ptr [[A]]
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asm volatile("; %0 This asm uses rsi" : : "r"(a));
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// CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, ptr [[A]]
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// CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]])
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return a;
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// CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, ptr [[A]]
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// CHECK: ret i32 [[TMP1]]
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}
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