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[ARM] Guard the declarations of f16 to f32 vcvt intrinsics in arm_neon.h by testing __ARM_FP 

Summary:
Conversions between float and half are only available when the
taraget has the half-precision extension. Guard these intrinsics
so that they don't cause crashes in the backend.

Fixes PR27550.

Reviewers: rengolin, t.p.northover

Subscribers: cfe-commits, aemerson, t.p.northover, rengolin

Differential Revision: http://reviews.llvm.org/D19665

llvm-svn: 268047
This commit is contained in:
Silviu Baranga 2016-04-29 15:03:32 +00:00
parent 14824b1c52
commit 3102a01258
2 changed files with 15 additions and 2 deletions
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6
clang/include/clang/Basic/arm_neon.td
View File

@ -704,8 +704,10 @@ def VGET_LOW : NoTestOpInst<"vget_low", "dk", "csilhfUcUsUiUlPcPs", OP_LO>;
////////////////////////////////////////////////////////////////////////////////
// E.3.22 Converting vectors
def VCVT_F16_F32 : SInst<"vcvt_f16_f32", "md", "Hf">;
def VCVT_F32_F16 : SInst<"vcvt_f32_f16", "wd", "h">;
let ArchGuard = "(__ARM_FP & 2)" in {
def VCVT_F16_F32 : SInst<"vcvt_f16_f32", "md", "Hf">;
def VCVT_F32_F16 : SInst<"vcvt_f32_f16", "wd", "h">;
}
def VCVT_S32 : SInst<"vcvt_s32", "xd", "fQf">;
def VCVT_U32 : SInst<"vcvt_u32", "ud", "fQf">;

11
clang/test/Sema/arm-no-fp16.c Normal file
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@ -0,0 +1,11 @@
// RUN: %clang_cc1 -triple thumbv7-none-eabi %s -target-feature +neon -target-feature -fp16 -fsyntax-only -verify
#include <arm_neon.h>
float16x4_t test_vcvt_f16_f32(float32x4_t a) {
return vcvt_f16_f32(a); // expected-warning{{implicit declaration of function 'vcvt_f16_f32'}} expected-error{{returning 'int' from a function with incompatible result type 'float16x4_t'}}
}
float32x4_t test_vcvt_f32_f16(float16x4_t a) {
return vcvt_f32_f16(a); // expected-warning{{implicit declaration of function 'vcvt_f32_f16'}} expected-error{{returning 'int' from a function with incompatible result type 'float32x4_t'}}
}