1b5e38a6c9
Summary: The "=r" output constraint for a structure variable passed to inline asm shouldn't be converted to "=*r", as this changes the asm directive semantics and prevents DSE optimizations. Instead, preserve the constraints and return such structures as integers of corresponding size, which are converted back to structures when storing the result. Fixes PR42672. Subscribers: cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D65234 llvm-svn: 370335
34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
// RUN: %clang_cc1 -triple armv7-apple-darwin -emit-llvm %s -o - | FileCheck %s
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// CHECK: call i32 asm "foo0", {{.*}} [[READNONE:#[0-9]+]]
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// CHECK: call i32 asm "foo1", {{.*}} [[READNONE]]
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// CHECK: call i32 asm "foo2", {{.*}} [[NOATTRS:#[0-9]+]]
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// CHECK: call i32 asm sideeffect "foo3", {{.*}} [[NOATTRS]]
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// CHECK: call i32 asm "foo4", {{.*}} [[READONLY:#[0-9]+]]
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// CHECK: call i32 asm "foo5", {{.*}} [[READONLY]]
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// CHECK: call i32 asm "foo6", {{.*}} [[NOATTRS]]
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// CHECK: call void asm sideeffect "foo7", {{.*}} [[NOATTRS]]
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// CHECK: call i32 asm "foo8", {{.*}} [[READNONE]]
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// CHECK: attributes [[READNONE]] = { nounwind readnone }
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// CHECK: attributes [[NOATTRS]] = { nounwind }
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// CHECK: attributes [[READONLY]] = { nounwind readonly }
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int g0, g1;
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struct S {
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int i;
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} g2;
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void test_attrs(int a) {
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__asm__ ("foo0" : "=r"(g1) : "r"(a));
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__asm__ ("foo1" : "=r"(g1) : "r"(a) : "cc");
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__asm__ ("foo2" : "=r"(g1) : "r"(a) : "memory");
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__asm__ volatile("foo3" : "=r"(g1) : "r"(a));
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__asm__ ("foo4" : "=r"(g1) : "r"(a), "m"(g0));
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__asm__ ("foo5" : "=r"(g1) : "r"(a), "Q"(g0));
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__asm__ ("foo6" : "=r"(g1), "=m"(g0) : "r"(a));
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__asm__ ("foo7" : : "r"(a));
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__asm__ ("foo8" : "=r"(g2) : "r"(a));
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}
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