118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
// RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -DSTRUCT -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-STRUCT
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// RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -USTRUCT -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-NOSTRUCT
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// RUN: not %clang_cc1 -triple=x86_64-unknown-linux-gnu -DIMPOSSIBLE_ODD -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-IMPOSSIBLE_ODD
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// RUN: not %clang_cc1 -triple=x86_64-unknown-linux-gnu -DIMPOSSIBLE_BIG -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-IMPOSSIBLE_BIG
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// RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -DPOSSIBLE_X -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-X
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// RUN: not %clang_cc1 -triple=x86_64-unknown-linux-gnu -DIMPOSSIBLE_X -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-IMPOSSIBLE_X
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// RUN: not %clang_cc1 -triple=x86_64-unknown-linux-gnu -DIMPOSSIBLE_9BYTES -emit-llvm %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK-IMPOSSIBLE_9BYTES
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// Make sure Clang doesn't treat |lockval| as asm input.
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void _raw_spin_lock(void) {
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#ifdef STRUCT
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struct {
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unsigned short owner, next;
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} lockval;
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lockval.owner = 1;
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lockval.next = 2;
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#else
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int lockval;
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lockval = 3;
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#endif
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asm("nop"
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: "=r"(lockval));
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}
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// CHECK-LABEL: _raw_spin_lock
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// CHECK-LABEL: entry:
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// CHECK-STRUCT: %lockval = alloca %struct.anon, align 2
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// CHECK-STRUCT: store i16 1
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// CHECK-STRUCT: store i16 2
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// CHECK-STRUCT: [[RES:%[0-9]+]] = call i32 asm "nop", "=r,~{dirflag},~{fpsr},~{flags}"()
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// CHECK-STRUCT: [[CAST:%[0-9]+]] = bitcast %struct.anon* %lockval to i32*
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// CHECK-STRUCT: store i32 [[RES]], i32* [[CAST]], align 2
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// CHECK-NOSTRUCT: %lockval = alloca i32, align 4
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// CHECK-NOSTRUCT: store i32 3
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// CHECK-NOSTRUCT: [[RES:%[0-9]+]] = call i32 asm "nop", "=r,~{dirflag},~{fpsr},~{flags}"()
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// CHECK-NOSTRUCT: store i32 [[RES]], i32* %lockval, align 4
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// Check Clang correctly handles a structure with padding.
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void unusual_struct(void) {
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struct {
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unsigned short first;
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unsigned char second;
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} str;
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asm("nop"
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: "=r"(str));
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}
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// Check Clang reports an error if attempting to return a structure for which
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// no direct conversion to a register is possible.
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void odd_struct(void) {
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#ifdef IMPOSSIBLE_ODD
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struct __attribute__((__packed__)) {
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unsigned short first;
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unsigned char second;
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} str;
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asm("nop"
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: "=r"(str));
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#endif
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}
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// CHECK-IMPOSSIBLE_ODD: impossible constraint in asm: can't store value into a register
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// Check Clang reports an error if attempting to return a big structure via a register.
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void big_struct(void) {
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#ifdef IMPOSSIBLE_BIG
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struct {
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long long int v1, v2, v3, v4;
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} str;
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asm("nop"
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: "=r"(str));
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#endif
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}
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// CHECK-IMPOSSIBLE_BIG: impossible constraint in asm: can't store value into a register
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// Clang is able to emit LLVM IR for an 16-byte structure.
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void x_constraint_fit() {
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#ifdef POSSIBLE_X
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struct S {
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unsigned x[4];
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} z;
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asm volatile("nop"
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: "=x"(z));
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#endif
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}
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// CHECK-LABEL: x_constraint_fit
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// CHECK-X: %z = alloca %struct.S, align 4
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// CHECK-X: [[RES:%[0-9]+]] = call i128 asm sideeffect "nop", "=x,~{dirflag},~{fpsr},~{flags}"()
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// CHECK-X: [[CAST:%[0-9]+]] = bitcast %struct.S* %z to i128*
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// CHECK-X: store i128 [[RES]], i128* [[CAST]], align 4
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// CHECK-X: ret
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// Clang is unable to emit LLVM IR for a 32-byte structure.
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void x_constraint_nofit() {
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#ifdef IMPOSSIBLE_X
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struct S {
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unsigned x[8];
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} z;
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asm volatile("nop"
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: "=x"(z));
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#endif
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}
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// CHECK-IMPOSSIBLE_X: invalid output size for constraint
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// http://crbug.com/999160
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// Clang used to report the following message:
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// "impossible constraint in asm: can't store struct into a register"
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// for the assembly directive below, although there's no struct.
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void crbug_999160_regtest() {
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#ifdef IMPOSSIBLE_9BYTES
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char buf[9];
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asm(""
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: "=r"(buf));
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#endif
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}
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// CHECK-IMPOSSIBLE_9BYTES: impossible constraint in asm: can't store value into a register
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