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

4 files changed, 19 insertions, 38 deletions

diff --git a/clang/test/CodeGen/pr41027.c b/clang/test/CodeGen/pr41027.c
new file mode 100644
index 00000000000..b60fe7d65e7
--- /dev/null
+++ b/clang/test/CodeGen/pr41027.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -S -O2 -o - %s | FileCheck %s
+
+// CHECK-LABEL: f:
+// CHECK:         movl $1, %eax
+// CHECK-NEXT:    #APP
+// CHECK-NEXT:    outl %eax, $1
+// CHECK-NEXT:    #NO_APP
+
+static inline void pr41027(unsigned a, unsigned b) {
+  if (__builtin_constant_p(a)) {
+    __asm__ volatile("outl %0,%w1" : : "a"(b), "n"(a));
+  } else {
+    __asm__ volatile("outl %0,%w1" : : "a"(b), "d"(a));
+  }
+}
+
+void f(unsigned port) {
+  pr41027(1, 1);
+}
diff --git a/clang/test/Sema/inline-asm-validate-riscv.c b/clang/test/Sema/inline-asm-validate-riscv.c
index cba08c86528..744f73e23cf 100644
--- a/clang/test/Sema/inline-asm-validate-riscv.c
+++ b/clang/test/Sema/inline-asm-validate-riscv.c
@@ -4,7 +4,6 @@
 void I(int i) {
   static const int BelowMin = -2049;
   static const int AboveMax = 2048;
-  asm volatile ("" :: "I"(i)); // expected-error{{constraint 'I' expects an integer constant expression}}
   asm volatile ("" :: "I"(BelowMin)); // expected-error{{value '-2049' out of range for constraint 'I'}}
   asm volatile ("" :: "I"(AboveMax)); // expected-error{{value '2048' out of range for constraint 'I'}}
 }
@@ -12,7 +11,6 @@ void I(int i) {
 void J(int j) {
   static const int BelowMin = -1;
   static const int AboveMax = 1;
-  asm volatile ("" :: "J"(j)); // expected-error{{constraint 'J' expects an integer constant expression}}
   asm volatile ("" :: "J"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'J'}}
   asm volatile ("" :: "J"(AboveMax)); // expected-error{{value '1' out of range for constraint 'J'}}
 }
@@ -20,7 +18,6 @@ void J(int j) {
 void K(int k) {
   static const int BelowMin = -1;
   static const int AboveMax = 32;
-  asm volatile ("" :: "K"(k)); // expected-error{{constraint 'K' expects an integer constant expression}}
   asm volatile ("" :: "K"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'K'}}
   asm volatile ("" :: "K"(AboveMax)); // expected-error{{value '32' out of range for constraint 'K'}}
 }
diff --git a/clang/test/Sema/inline-asm-validate-x86.c b/clang/test/Sema/inline-asm-validate-x86.c
index c6fa2e1b4fa..87b60a09553 100644
--- a/clang/test/Sema/inline-asm-validate-x86.c
+++ b/clang/test/Sema/inline-asm-validate-x86.c
@@ -6,9 +6,6 @@ void I(int i, int j) {
   static const int AboveMax = 32;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "I"(j)); // expected-error{{constraint 'I' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "I"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'I'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -23,9 +20,6 @@ void J(int i, int j) {
   static const int AboveMax = 64;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "J"(j)); // expected-error{{constraint 'J' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "J"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'J'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -40,9 +34,6 @@ void K(int i, int j) {
   static const int AboveMax = 128;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "K"(j)); // expected-error{{constraint 'K' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "K"(BelowMin)); // expected-error{{value '-129' out of range for constraint 'K'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -62,9 +53,6 @@ void L(int i, int j) {
   static const int Valid3 = 0xffffffff;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "L"(j)); // expected-error{{constraint 'L' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "L"(Invalid1)); // expected-error{{value '1' out of range for constraint 'L'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -91,9 +79,6 @@ void M(int i, int j) {
   static const int AboveMax = 4;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "M"(j)); // expected-error{{constraint 'M' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "M"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'M'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -108,9 +93,6 @@ void N(int i, int j) {
   static const int AboveMax = 256;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "N"(j)); // expected-error{{constraint 'N' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "N"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'N'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -125,9 +107,6 @@ void O(int i, int j) {
   static const int AboveMax = 128;
   __asm__("xorl %0,%2"
           : "=r"(i)
-          : "0"(i), "O"(j)); // expected-error{{constraint 'O' expects an integer constant expression}}
-  __asm__("xorl %0,%2"
-          : "=r"(i)
           : "0"(i), "O"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'O'}}
   __asm__("xorl %0,%2"
           : "=r"(i)
@@ -146,10 +125,6 @@ void pr40890(void) {
   __asm__ __volatile__("\n#define S_A abcd%0\n" : : "n"(&((struct s*)0)->a));
   // This offset-from-null pointer can be used as an integer constant expression.
   __asm__ __volatile__("\n#define S_B abcd%0\n" : : "n"(&((struct s*)0)->b));
-  // This pointer cannot be used as an integer constant expression.
-  __asm__ __volatile__("\n#define GLOBAL_A abcd%0\n" : : "n"(&s.a)); // expected-error{{constraint 'n' expects an integer constant expression}}
-  // Floating-point is also not okay.
-  __asm__ __volatile__("\n#define PI abcd%0\n" : : "n"(3.14f)); // expected-error{{constraint 'n' expects an integer constant expression}}
 #ifdef AMD64
   // This arbitrary pointer is fine.
   __asm__ __volatile__("\n#define BEEF abcd%0\n" : : "n"((int*)0xdeadbeeeeeef));
diff --git a/clang/test/Sema/pr41027.c b/clang/test/Sema/pr41027.c
deleted file mode 100644
index 94ace646381..00000000000
--- a/clang/test/Sema/pr41027.c
+++ /dev/null
@@ -1,10 +0,0 @@
-// RUN: %clang_cc1 -triple x86_64 -fsyntax-only %s
-// XFAIL: *
-
-inline void pr41027(unsigned a, unsigned b) {
-  if (__builtin_constant_p(a)) {
-    __asm__ volatile("outl %0,%w1" : : "a"(b), "n"(a));
-  } else {
-    __asm__ volatile("outl %0,%w1" : : "a"(b), "d"(a));
-  }
-}