clang/test/Parser/fp-floatcontrol-syntax.cpp

   1 // RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only -DCHECK_ERROR %s -verify
   2
   3 float function_scope(float a) {
   4 #pragma float_control(precise, on) junk // expected-warning {{extra tokens at end of '#pragma float_control' - ignored}}
   5   return a;
   6 }
   7
   8 // Ok, at namespace scope.
   9 namespace foo {
  10 #pragma float_control(push)
  11 #pragma float_control(pop)
  12 }
  13
  14 // Ok, within a language linkage specification.
  15 extern "C" {
  16 #pragma float_control(push)
  17 #pragma float_control(pop)
  18 }
  19
  20 // Same.
  21 extern "C++" {
  22 #pragma float_control(push)
  23 #pragma float_control(pop)
  24 }
  25
  26 #ifdef CHECK_ERROR
  27 // Ok at file scope.
  28 #pragma float_control(push)
  29 #pragma float_control(pop)
  30 #pragma float_control(precise, on, push)
  31 void check_stack() {
  32   // Not okay within a function declaration.
  33 #pragma float_control(push)                   // expected-error {{can only appear at file or namespace scope or within a language linkage specification}}
  34 #pragma float_control(pop)                    // expected-error {{can only appear at file or namespace scope or within a language linkage specification}}
  35 #pragma float_control(precise, on, push)      // expected-error {{can only appear at file or namespace scope or within a language linkage specification}}
  36 #pragma float_control(except, on, push)       // expected-error {{can only appear at file or namespace scope or within a language linkage specification}}
  37 #pragma float_control(except, on, push, junk) // expected-error {{float_control is malformed}}
  38   return;
  39 }
  40 #endif
  41
  42 // RUN: %clang_cc1 -triple x86_64-linux-gnu -fdenormal-fp-math=preserve-sign,preserve-sign -fsyntax-only %s -DDEFAULT -verify
  43 // RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only %s -ffp-contract=fast -DPRECISE -verify
  44 // RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only %s -ffp-contract=off -frounding-math -ffp-exception-behavior=strict -DSTRICT -verify
  45 // RUN: %clang_cc1 -triple x86_64-linux-gnu -menable-no-infs -menable-no-nans -menable-unsafe-fp-math -fno-signed-zeros -mreassociate -freciprocal-math -ffp-contract=fast -ffast-math -ffinite-math-only -fsyntax-only %s -DFAST -verify
  46 double a = 0.0;
  47 double b = 1.0;
  48
  49 #ifdef STRICT
  50 #pragma float_control(precise, off) // expected-error {{'#pragma float_control(precise, off)' is illegal when except is enabled}}
  51 #else
  52 #ifndef FAST
  53 #pragma STDC FENV_ACCESS ON
  54 #pragma float_control(precise, off) // expected-error {{'#pragma float_control(precise, off)' is illegal when except is enabled}}
  55 #endif
  56 #endif
  57
  58 #pragma float_control(precise, on)
  59 #pragma float_control(except, on) // OK
  60 #ifndef STRICT
  61 #pragma float_control(except, on)
  62 #pragma float_control(precise, off) // expected-error {{'#pragma float_control(precise, off)' is illegal when except is enabled}}
  63 #endif
  64 int main() {
  65 #ifdef STRICT
  66 #pragma float_control(precise, off) // expected-error {{'#pragma float_control(precise, off)' is illegal when except is enabled}}
  67 #else
  68 #pragma float_control(precise, off) // expected-error {{'#pragma float_control(precise, off)' is illegal when except is enabled}}
  69 #endif
  70 #pragma float_control(except, on)
  71   //  error: '#pragma float_control(except, on)' is illegal when precise is disabled
  72   double x = b / a; // only used for fp flag setting
  73   if (a == a)       // only used for fp flag setting
  74     return 0;       //(int)x;
  75 }