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998c910262
Summary: This fixes MultiSource/Applications/lemon on big-endian N32 by correcting the handling of the argument to wait(). glibc defines it as a transparent union of void* and int*. Such unions are passed according to the rules of the first member so the argument must be passed as if it were a void* (sign extended from i32 to i64) and not as a union (shifted to the upper bits of an i64). wait() already behaves correctly on big-endian O32 and N64 since the union is already the same size as an argument slot. Reviewers: atanasyan Reviewed By: atanasyan Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D6963 llvm-svn: 225981
28 lines
822 B
C
28 lines
822 B
C
// RUN: %clang_cc1 -triple mips64-linux-gnu -S -o - -emit-llvm %s | FileCheck %s
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//
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// Transparent unions are passed according to the calling convention rules of
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// the first member. In this case, it is as if it were a void pointer so we
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// do not have the inreg attribute we would normally have for unions.
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//
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// This comes up in glibc's wait() function and matters for the big-endian N32
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// case where pointers are promoted to i64 and a non-transparent union would be
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// passed in the upper 32-bits of an i64.
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union either_pointer {
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void *void_ptr;
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int *int_ptr;
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} __attribute__((transparent_union));
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extern void foo(union either_pointer p);
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int data;
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void bar(void) {
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return foo(&data);
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}
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// CHECK-LABEL: define void @bar()
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// CHECK: call void @foo(i8* %{{[0-9]+}})
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// CHECK: declare void @foo(i8*)
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