15f15ab2c8
This patch is to fix the [[ https://github.com/llvm/llvm-project/issues/63045 | issue 63045]].
Look at the following code:
```
int main(int argc, char *argv[]) {
int arr[1000];
__asm movdir64b rax, ZMMWORD PTR [arr]
return 0;
}
```
Compiling this code using `clang -O0 -fasm-blocks bug.c` gives the a linker error.
The problem seems to be in the generated assembly. Following is the out put of `clang -S -O0 -fasm-blocks bug.c`:
```
movq %rsi, -16(%rbp)
#APP
movdir64b arr, %rax
#NO_APP
xorl %eax, %eax
```
The symbol `arr` should be replaced with some address like `-4(%rbp)`.
This makes me believe that issue is not in the linker, but with the ASM parser.
This issue originates with patch [D145893](https://reviews.llvm.org/D145893). And that's why reverting it fixes the issue. More specifically, the function [isMem512_GR64()](ff471dcf76/llvm/lib/Target/X86/AsmParser/X86Operand.h (L404)) within the [llvm/lib/Target/X86/AsmParser/X86Operand.h](https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/X86/AsmParser/X86Operand.h) file.
Reviewed By: skan
Differential Revision: https://reviews.llvm.org/D151863
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
// REQUIRES: x86-registered-target
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// RUN: %clang_cc1 %s -triple x86_64-apple-darwin10 -Wno-strict-prototypes -fasm-blocks -emit-llvm -o - | FileCheck %s
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void t1(void) {
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int var = 10;
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__asm mov rax, offset var ; rax = address of myvar
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// CHECK: t1
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// CHECK: call void asm sideeffect inteldialect
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// CHECK-SAME: mov rax, $0
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// CHECK-SAME: "r,~{rax},~{dirflag},~{fpsr},~{flags}"(ptr %{{.*}})
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}
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void t2(void) {
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int var = 10;
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__asm mov qword ptr [eax], offset var
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// CHECK: t2
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// CHECK: call void asm sideeffect inteldialect
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// CHECK-SAME: mov qword ptr [eax], $0
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// CHECK-SAME: "r,~{dirflag},~{fpsr},~{flags}"(ptr %{{.*}})
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}
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struct t3_type { int a, b; };
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int t3(void) {
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struct t3_type foo;
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foo.a = 1;
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foo.b = 2;
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__asm {
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lea ebx, foo
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mov eax, [ebx].0
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mov [ebx].4, ecx
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}
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return foo.b;
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// CHECK: t3
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// CHECK: call void asm sideeffect inteldialect
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// CHECK-SAME: lea ebx, $0
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// CHECK-SAME: mov eax, [ebx]
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// CHECK-SAME: mov [ebx + $$4], ecx
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// CHECK-SAME: "*m,~{eax},~{ebx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(%struct.t3_type) %{{.*}})
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}
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int t4(void) {
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struct t3_type foo;
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foo.a = 1;
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foo.b = 2;
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__asm {
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lea ebx, foo
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{
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mov eax, [ebx].foo.a
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}
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mov [ebx].foo.b, ecx
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}
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return foo.b;
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// CHECK: t4
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// CHECK: call void asm sideeffect inteldialect
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// CHECK-SAME: lea ebx, $0
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// CHECK-SAME: mov eax, [ebx]
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// CHECK-SAME: mov [ebx + $$4], ecx
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// CHECK-SAME: "*m,~{eax},~{ebx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(%struct.t3_type) %{{.*}})
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}
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void bar() {}
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void t5(void) {
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__asm {
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call bar
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jmp bar
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}
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// CHECK: t5
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// CHECK: call void asm sideeffect inteldialect
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// CHECK-SAME: call ${0:P}
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// CHECK-SAME: jmp ${1:P}
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// CHECK-SAME: "*m,*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (...)) @bar, ptr elementtype(void (...)) @bar)
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}
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void t47(void) {
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// CHECK-LABEL: define{{.*}} void @t47
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int arr[1000];
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__asm movdir64b rax, zmmword ptr [arr]
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// CHECK: call void asm sideeffect inteldialect "movdir64b rax, zmmword ptr $0", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype([1000 x i32]) %arr)
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}
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