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 `{{.*}} `.
33 lines
936 B
C
33 lines
936 B
C
// RUN: %clang_cc1 -triple x86_64 -emit-llvm -o - %s | FileCheck %s
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// Check that we don't generate unnecessary reloads.
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//
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// CHECK-LABEL: define{{.*}} void @f0()
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// CHECK: [[x_0:%.*]] = alloca i32, align 4
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// CHECK-NEXT: [[y_0:%.*]] = alloca i32, align 4
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// CHECK-NEXT: store i32 1, i32* [[x_0]]
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// CHECK-NEXT: store i32 1, i32* [[x_0]]
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// CHECK-NEXT: store i32 1, i32* [[y_0]]
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// CHECK: }
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void f0() {
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int x, y;
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x = 1;
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y = (x = 1);
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}
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// This used to test that we generate reloads for volatile access,
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// but that does not appear to be correct behavior for C.
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//
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// CHECK-LABEL: define{{.*}} void @f1()
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// CHECK: [[x_1:%.*]] = alloca i32, align 4
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// CHECK-NEXT: [[y_1:%.*]] = alloca i32, align 4
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// CHECK-NEXT: store volatile i32 1, i32* [[x_1]]
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// CHECK-NEXT: store volatile i32 1, i32* [[x_1]]
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// CHECK-NEXT: store volatile i32 1, i32* [[y_1]]
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// CHECK: }
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void f1() {
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volatile int x, y;
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x = 1;
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y = (x = 1);
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}
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