2019-08-08 03:36:48 +08:00
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// REQUIRES: x86-registered-target
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Delay diagnosing asm constraints that require immediates until after inlining
Summary:
An inline asm call may result in an immediate input value after inlining.
Therefore, don't emit a diagnostic here if the input isn't an immediate.
Reviewers: joerg, eli.friedman, rsmith
Subscribers: asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, s.egerton, krytarowski, mgorny, riccibruno, eraman, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D60943
llvm-svn: 368104
2019-08-07 06:41:22 +08:00
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -S -O2 -o - %s | FileCheck %s
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// CHECK-LABEL: f:
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// CHECK: movl $1, %eax
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// CHECK-NEXT: #APP
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// CHECK-NEXT: outl %eax, $1
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// CHECK-NEXT: #NO_APP
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static inline void pr41027(unsigned a, unsigned b) {
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if (__builtin_constant_p(a)) {
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__asm__ volatile("outl %0,%w1" : : "a"(b), "n"(a));
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} else {
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__asm__ volatile("outl %0,%w1" : : "a"(b), "d"(a));
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}
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}
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void f(unsigned port) {
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pr41027(1, 1);
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}
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