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8a2f3c778e
The X86-64 ABI code didn't handle the case when a struct would get classified and turn up as "NoClass INTEGER" for example. This is perfectly possible when the first slot is all padding (e.g. due to empty base classes). In this situation, the first 8-byte doesn't take a register at all, only the second 8-byte does. This fixes this by enhancing the x86-64 abi stuff to allow and handle this case, reverts the broken fix for PR5831, and enhances the target independent stuff to be able to handle an argument value in registers being accessed at an offset from the memory value. This is the last x86-64 calling convention related miscompile that I'm aware of. llvm-svn: 109848
79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
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// Basic base class test.
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struct f0_s0 { unsigned a; };
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struct f0_s1 : public f0_s0 { void *b; };
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// CHECK: define void @_Z2f05f0_s1(i64 %a0.coerce0, i8* %a0.coerce1)
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void f0(f0_s1 a0) { }
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// Check with two eight-bytes in base class.
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struct f1_s0 { unsigned a; unsigned b; float c; };
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struct f1_s1 : public f1_s0 { float d;};
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// CHECK: define void @_Z2f15f1_s1(i64 %a0.coerce0, double %a0.coerce1)
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void f1(f1_s1 a0) { }
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// Check with two eight-bytes in base class and merge.
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struct f2_s0 { unsigned a; unsigned b; float c; };
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struct f2_s1 : public f2_s0 { char d;};
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// CHECK: define void @_Z2f25f2_s1(i64 %a0.coerce0, i64 %a0.coerce1)
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void f2(f2_s1 a0) { }
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// PR5831
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// CHECK: define void @_Z2f34s3_1(i64 %x.coerce)
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struct s3_0 {};
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struct s3_1 { struct s3_0 a; long b; };
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void f3(struct s3_1 x) {}
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// CHECK: define i64 @_Z4f4_0M2s4i(i64 %a)
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// CHECK: define {{.*}} @_Z4f4_1M2s4FivE(i64 %a.coerce0, i64 %a.coerce1)
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struct s4 {};
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typedef int s4::* s4_mdp;
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typedef int (s4::*s4_mfp)();
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s4_mdp f4_0(s4_mdp a) { return a; }
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s4_mfp f4_1(s4_mfp a) { return a; }
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namespace PR7523 {
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struct StringRef {
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char *a;
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};
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void AddKeyword(StringRef, int x);
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void foo() {
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// CHECK: define void @_ZN6PR75233fooEv()
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// CHECK: call void @_ZN6PR752310AddKeywordENS_9StringRefEi(i8* {{.*}}, i32 4)
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AddKeyword(StringRef(), 4);
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}
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}
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namespace PR7742 { // Also rdar://8250764
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struct s2 {
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float a[2];
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};
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struct c2 : public s2 {};
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// CHECK: define double @_ZN6PR77423fooEPNS_2c2E(%"struct.PR7742::c2"* %P)
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c2 foo(c2 *P) {
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}
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}
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namespace PR5179 {
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struct B {};
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struct B1 : B {
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int* pa;
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};
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struct B2 : B {
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B1 b1;
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};
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// CHECK: define i8* @_ZN6PR51793barENS_2B2E(i32* %b2.coerce)
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const void *bar(B2 b2) {
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return b2.b1.pa;
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}
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}
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