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Summary: The getConstraintRegister method is used by semantic checking of inline assembly statements in order to diagnose conflicts between clobber list and input/output lists. Currently ARM and AArch64 don't override getConstraintRegister, so conflicts between registers assigned to variables in asm labels and clobber lists are not diagnosed. Such conflicts can cause assertion failures in the back end and even miscompilations. This patch implements getConstraintRegister for ARM and AArch64 targets. Since these targets don't have single-register constraints, the implementation is trivial and just returns the register specified in an asm label (if any). Reviewers: eli.friedman, javed.absar, thopre Reviewed By: thopre Subscribers: rengolin, eraman, rogfer01, myatsina, kristof.beyls, cfe-commits, chrib Differential Revision: https://reviews.llvm.org/D45965 llvm-svn: 331164
20 lines
686 B
C
20 lines
686 B
C
// RUN: %clang_cc1 %s -triple armv7-apple-darwin -verify -fsyntax-only
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void f (void) {
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int Val;
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asm volatile ("lw (r1), %0[val]": "=&b"(Val)); // expected-error {{invalid output constraint '=&b' in asm}}
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return;
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}
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void test_64bit_r(void) {
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long long foo = 0, bar = 0;
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asm volatile("INST %0, %1" : "=r"(foo) : "r"(bar));
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}
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void test_clobber_conflict(void) {
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register int x asm("r1");
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asm volatile("nop" :: "r"(x) : "%r1"); // expected-error {{conflicts with asm clobber list}}
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asm volatile("nop" :: "l"(x) : "%r1"); // expected-error {{conflicts with asm clobber list}}
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asm volatile("nop" : "=r"(x) :: "%r1"); // expected-error {{conflicts with asm clobber list}}
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}
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