[CodeGen] make nan builtins pure rather than const (PR37778)

https://bugs.llvm.org/show_bug.cgi?id=37778
...shows a miscompile resulting from marking nan builtins as 'const'.

The nan libcalls/builtins take a pointer argument:
http://www.cplusplus.com/reference/cmath/nan-function/
...and the chars dereferenced by that arg are used to fill in the NaN constant payload bits.

"const" means that the pointer argument isn't dereferenced. That's translated to "readnone" in LLVM.
"pure" means that the pointer argument may be dereferenced. That's translated to "readonly" in LLVM.

This change prevents the IR optimizer from killing the lead-up to the nan call here:

double a() {
  char buf[4];
  buf[0] = buf[1] = buf[2] = '9';
  buf[3] = '\0';
  return __builtin_nan(buf);
}

...the optimizer isn't currently able to simplify this to a constant as we might hope,
but this patch should solve the miscompile.

Differential Revision: https://reviews.llvm.org/D48134

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@334628 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Basic/Builtins.def b/include/clang/Basic/Builtins.def
index 6f39c1630241386a653dfa6b6a0a1be7a81f11f7..dd0730f96104c906e3e80a5d031ad996efbd222c 100644 (file)
--- a/include/clang/Basic/Builtins.def
+++ b/include/clang/Basic/Builtins.def
@@ -137,14 +137,14 @@ BUILTIN(__builtin_ldexpl, "LdLdi", "Fne")
 BUILTIN(__builtin_modf , "ddd*"  , "Fn")
 BUILTIN(__builtin_modff, "fff*"  , "Fn")
 BUILTIN(__builtin_modfl, "LdLdLd*", "Fn")
-BUILTIN(__builtin_nan,  "dcC*" , "ncF")
-BUILTIN(__builtin_nanf, "fcC*" , "ncF")
-BUILTIN(__builtin_nanl, "LdcC*", "ncF")
-BUILTIN(__builtin_nanf128, "LLdcC*", "ncF")
-BUILTIN(__builtin_nans,  "dcC*" , "ncF")
-BUILTIN(__builtin_nansf, "fcC*" , "ncF")
-BUILTIN(__builtin_nansl, "LdcC*", "ncF")
-BUILTIN(__builtin_nansf128, "LLdcC*", "ncF")
+BUILTIN(__builtin_nan,  "dcC*" , "FnU")
+BUILTIN(__builtin_nanf, "fcC*" , "FnU")
+BUILTIN(__builtin_nanl, "LdcC*", "FnU")
+BUILTIN(__builtin_nanf128, "LLdcC*", "FnU")
+BUILTIN(__builtin_nans,  "dcC*" , "FnU")
+BUILTIN(__builtin_nansf, "fcC*" , "FnU")
+BUILTIN(__builtin_nansl, "LdcC*", "FnU")
+BUILTIN(__builtin_nansf128, "LLdcC*", "FnU")
 BUILTIN(__builtin_powi , "ddi"  , "Fnc")
 BUILTIN(__builtin_powif, "ffi"  , "Fnc")
 BUILTIN(__builtin_powil, "LdLdi", "Fnc")

diff --git a/test/CodeGen/math-builtins.c b/test/CodeGen/math-builtins.c
index 4be8981ec3688fc6fc90c6d8eae46fc2bf19fdbc..82f049bdd12ef14d43f7cca50736ae2d1e23f729 100644 (file)
--- a/test/CodeGen/math-builtins.c
+++ b/test/CodeGen/math-builtins.c
@@ -90,25 +90,25 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
 
   __builtin_nan(c);        __builtin_nanf(c);       __builtin_nanl(c); __builtin_nanf128(c);
 
-// NO__ERRNO: declare double @nan(i8*) [[READNONE]]
-// NO__ERRNO: declare float @nanf(i8*) [[READNONE]]
-// NO__ERRNO: declare x86_fp80 @nanl(i8*) [[READNONE]]
-// NO__ERRNO: declare fp128 @nanf128(i8*) [[READNONE]]
-// HAS_ERRNO: declare double @nan(i8*) [[READNONE:#[0-9]+]]
-// HAS_ERRNO: declare float @nanf(i8*) [[READNONE]]
-// HAS_ERRNO: declare x86_fp80 @nanl(i8*) [[READNONE]]
-// HAS_ERRNO: declare fp128 @nanf128(i8*) [[READNONE]]
+// NO__ERRNO: declare double @nan(i8*) [[PURE:#[0-9]+]]
+// NO__ERRNO: declare float @nanf(i8*) [[PURE]]
+// NO__ERRNO: declare x86_fp80 @nanl(i8*) [[PURE]]
+// NO__ERRNO: declare fp128 @nanf128(i8*) [[PURE]]
+// HAS_ERRNO: declare double @nan(i8*) [[PURE:#[0-9]+]]
+// HAS_ERRNO: declare float @nanf(i8*) [[PURE]]
+// HAS_ERRNO: declare x86_fp80 @nanl(i8*) [[PURE]]
+// HAS_ERRNO: declare fp128 @nanf128(i8*) [[PURE]]
 
   __builtin_nans(c);        __builtin_nansf(c);       __builtin_nansl(c); __builtin_nansf128(c);
 
-// NO__ERRNO: declare double @nans(i8*) [[READNONE]]
-// NO__ERRNO: declare float @nansf(i8*) [[READNONE]]
-// NO__ERRNO: declare x86_fp80 @nansl(i8*) [[READNONE]]
-// NO__ERRNO: declare fp128 @nansf128(i8*) [[READNONE]]
-// HAS_ERRNO: declare double @nans(i8*) [[READNONE]]
-// HAS_ERRNO: declare float @nansf(i8*) [[READNONE]]
-// HAS_ERRNO: declare x86_fp80 @nansl(i8*) [[READNONE]]
-// HAS_ERRNO: declare fp128 @nansf128(i8*) [[READNONE]]
+// NO__ERRNO: declare double @nans(i8*) [[PURE]]
+// NO__ERRNO: declare float @nansf(i8*) [[PURE]]
+// NO__ERRNO: declare x86_fp80 @nansl(i8*) [[PURE]]
+// NO__ERRNO: declare fp128 @nansf128(i8*) [[PURE]]
+// HAS_ERRNO: declare double @nans(i8*) [[PURE]]
+// HAS_ERRNO: declare float @nansf(i8*) [[PURE]]
+// HAS_ERRNO: declare x86_fp80 @nansl(i8*) [[PURE]]
+// HAS_ERRNO: declare fp128 @nansf128(i8*) [[PURE]]
 
   __builtin_pow(f,f);        __builtin_powf(f,f);       __builtin_powl(f,f);
 
@@ -188,7 +188,7 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
 // NO__ERRNO: declare double @cbrt(double) [[READNONE]]
 // NO__ERRNO: declare float @cbrtf(float) [[READNONE]]
 // NO__ERRNO: declare x86_fp80 @cbrtl(x86_fp80) [[READNONE]]
-// HAS_ERRNO: declare double @cbrt(double) [[READNONE]]
+// HAS_ERRNO: declare double @cbrt(double) [[READNONE:#[0-9]+]]
 // HAS_ERRNO: declare float @cbrtf(float) [[READNONE]]
 // HAS_ERRNO: declare x86_fp80 @cbrtl(x86_fp80) [[READNONE]]
 
@@ -581,9 +581,11 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
 // NO__ERRNO: attributes [[READNONE]] = { {{.*}}readnone{{.*}} }
 // NO__ERRNO: attributes [[READNONE_INTRINSIC]] = { {{.*}}readnone{{.*}} }
 // NO__ERRNO: attributes [[NOT_READNONE]] = { nounwind "correctly{{.*}} }
+// NO__ERRNO: attributes [[PURE]] = { {{.*}}readonly{{.*}} }
 
 // HAS_ERRNO: attributes [[NOT_READNONE]] = { nounwind "correctly{{.*}} }
 // HAS_ERRNO: attributes [[READNONE_INTRINSIC]] = { {{.*}}readnone{{.*}} }
+// HAS_ERRNO: attributes [[PURE]] = { {{.*}}readonly{{.*}} }
 // HAS_ERRNO: attributes [[READNONE]] = { {{.*}}readnone{{.*}} }
 
 // HAS_ERRNO_GNU: attributes [[READNONE_INTRINSIC]] = { {{.*}}readnone{{.*}} }