fd739804e0
For a default visibility external linkage definition, dso_local is set for ELF
-fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar
to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences.
To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition,
which sets dso_local for default visibility external linkage definitions.
To make this flip smooth and enable future (dso_local as definition default),
this patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
44 lines
886 B
C
44 lines
886 B
C
// RUN: %clang_cc1 -triple s390x-linux-gnu -emit-llvm %s -o - | FileCheck %s
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// SystemZ prefers to align all global variables to two bytes.
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struct test {
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signed char a;
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};
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char c;
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// CHECK-DAG: @c ={{.*}} global i8 0, align 2
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struct test s;
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// CHECK-DAG: @s ={{.*}} global %struct.test zeroinitializer, align 2
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extern char ec;
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// CHECK-DAG: @ec = external global i8, align 2
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extern struct test es;
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// CHECK-DAG: @es = external global %struct.test, align 2
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// Dummy function to make sure external symbols are used.
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void func (void)
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{
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c = ec;
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s = es;
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}
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// Alignment should be respected for coerced argument loads
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struct arg { long y __attribute__((packed, aligned(4))); };
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extern struct arg x;
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void f(struct arg);
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void test (void)
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{
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f(x);
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}
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// CHECK-LABEL: @test
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// CHECK: load i64, i64* getelementptr inbounds (%struct.arg, %struct.arg* @x, i32 0, i32 0), align 4
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