[PATCH] D147733: Set rounding_mode to tonearest in presence of a #pragma STDC FENV_ACCESS OFF.

Tue, 11 Apr 2023 03:24:10 -0700 

zahiraam updated this revision to Diff 512388.

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D147733/new/

https://reviews.llvm.org/D147733

Files:
  clang/lib/Sema/SemaAttr.cpp
  clang/test/CodeGen/pragma-fenv_access.c


Index: clang/test/CodeGen/pragma-fenv_access.c
===================================================================
--- clang/test/CodeGen/pragma-fenv_access.c
+++ clang/test/CodeGen/pragma-fenv_access.c
@@ -1,13 +1,17 @@
 // RUN: %clang_cc1 -fexperimental-strict-floating-point 
-ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - | 
FileCheck --check-prefixes=CHECK,STRICT %s
+// RUN: %clang_cc1 -fexperimental-strict-floating-point -frounding-math 
-ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - | 
FileCheck --check-prefixes=CHECK,STRICT-RND %s
 // RUN: %clang_cc1 -fexperimental-strict-floating-point 
-ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - 
-fms-extensions -DMS | FileCheck --check-prefixes=CHECK,STRICT %s
+// RUN: %clang_cc1 -fexperimental-strict-floating-point -frounding-math 
-ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - 
-fms-extensions -DMS | FileCheck --check-prefixes=CHECK,STRICT-RND %s
 // RUN: %clang_cc1 -fexperimental-strict-floating-point -triple 
%itanium_abi_triple -emit-llvm %s -o - | FileCheck 
--check-prefixes=CHECK,DEFAULT %s
-
+// RUN: %clang_cc1 -fexperimental-strict-floating-point -frounding-math 
-triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck 
--check-prefixes=CHECK,DEFAULT-RND %s
 
 float func_00(float x, float y) {
   return x + y;
 }
 // CHECK-LABEL: @func_00
 // STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, 
float {{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// STRICT-RND: call float @llvm.experimental.constrained.fadd.f32(float 
{{.*}}, float {{.*}}, metadata !"round.dynamic", metadata !"fpexcept.strict")
+// DEFAULT-RND: call float @llvm.experimental.constrained.fadd.f32(float 
{{.*}}, float {{.*}}, metadata !"round.dynamic", metadata !"fpexcept.ignore")
 // DEFAULT: fadd float
 
 
@@ -224,3 +228,17 @@
 // STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, 
float {{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
 // DEFAULT: fadd float
 
+#pragma STDC FENV_ACCESS ON
+float func_19(float x, float y) {
+  return x + y;
+}
+// CHECK-LABEL: @func_19
+// STRICT:  call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, 
float {{.*}}, metadata !"round.dynamic", metadata !"fpexcept.strict")
+
+#pragma STDC FENV_ACCESS OFF
+float func_20(float x, float y) {
+  return x + y;
+}
+// CHECK-LABEL: @func_20
+// STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, 
float {{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// DEFAULT: fadd float
Index: clang/lib/Sema/SemaAttr.cpp
===================================================================
--- clang/lib/Sema/SemaAttr.cpp
+++ clang/lib/Sema/SemaAttr.cpp
@@ -1336,6 +1336,7 @@
       Diag(Loc, diag::err_pragma_fenv_requires_precise);
   }
   NewFPFeatures.setAllowFEnvAccessOverride(IsEnabled);
+  NewFPFeatures.setRoundingMathOverride(IsEnabled);
   FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
   CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
 }



Index: clang/test/CodeGen/pragma-fenv_access.c
===================================================================
--- clang/test/CodeGen/pragma-fenv_access.c
+++ clang/test/CodeGen/pragma-fenv_access.c
@@ -1,13 +1,17 @@
 // RUN: %clang_cc1 -fexperimental-strict-floating-point -ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK,STRICT %s
+// RUN: %clang_cc1 -fexperimental-strict-floating-point -frounding-math -ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK,STRICT-RND %s
 // RUN: %clang_cc1 -fexperimental-strict-floating-point -ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - -fms-extensions -DMS | FileCheck --check-prefixes=CHECK,STRICT %s
+// RUN: %clang_cc1 -fexperimental-strict-floating-point -frounding-math -ffp-exception-behavior=strict -triple %itanium_abi_triple -emit-llvm %s -o - -fms-extensions -DMS | FileCheck --check-prefixes=CHECK,STRICT-RND %s
 // RUN: %clang_cc1 -fexperimental-strict-floating-point -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK,DEFAULT %s
-
+// RUN: %clang_cc1 -fexperimental-strict-floating-point -frounding-math -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK,DEFAULT-RND %s
 
 float func_00(float x, float y) {
   return x + y;
 }
 // CHECK-LABEL: @func_00
 // STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// STRICT-RND: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, metadata !"round.dynamic", metadata !"fpexcept.strict")
+// DEFAULT-RND: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, metadata !"round.dynamic", metadata !"fpexcept.ignore")
 // DEFAULT: fadd float
 
 
@@ -224,3 +228,17 @@
 // STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
 // DEFAULT: fadd float
 
+#pragma STDC FENV_ACCESS ON
+float func_19(float x, float y) {
+  return x + y;
+}
+// CHECK-LABEL: @func_19
+// STRICT:  call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, metadata !"round.dynamic", metadata !"fpexcept.strict")
+
+#pragma STDC FENV_ACCESS OFF
+float func_20(float x, float y) {
+  return x + y;
+}
+// CHECK-LABEL: @func_20
+// STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// DEFAULT: fadd float
Index: clang/lib/Sema/SemaAttr.cpp
===================================================================
--- clang/lib/Sema/SemaAttr.cpp
+++ clang/lib/Sema/SemaAttr.cpp
@@ -1336,6 +1336,7 @@
       Diag(Loc, diag::err_pragma_fenv_requires_precise);
   }
   NewFPFeatures.setAllowFEnvAccessOverride(IsEnabled);
+  NewFPFeatures.setRoundingMathOverride(IsEnabled);
   FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
   CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
 }

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