[NEON] Define half-precision vmaxnm intrinsics only when available

[kosarev]

Ping.

[SjoerdMeijer]

LGTM

include/clang/Basic/arm_neon.td

1466

nit: indentation?

[kosarev]

Thanks for reviewing!

include/clang/Basic/arm_neon.td

1466

Do we want some special indentation here?

[SjoerdMeijer]

include/clang/Basic/arm_neon.td

1466

Ah, sorry, got confused, it's just one big string.

include/clang/Basic/arm_neon.td

let isVCVT_N = 1 in {
     def VCVT_N_F16 : SInst<"vcvt_n_f16", "Hdi", "sUsQsQUs">;
     def VCVT_N_S16 : SInst<"vcvt_n_s16", "xdi", "hQh">;
     def VCVT_N_U16 : SInst<"vcvt_n_u16", "udi", "hQh">;
   }
 
   // Max/Min
   def VMAXH         : SInst<"vmax", "ddd", "hQh">;
   def VMINH         : SInst<"vmin", "ddd", "hQh">;
+  let ArchGuard = "__ARM_ARCH >= 8 && defined(__ARM_FEATURE_NUMERIC_MAXMIN) && defined(__ARM_FEATURE_FP16_VECTOR_ARITHMETIC)" in {
     def FMAXNMH       : SInst<"vmaxnm", "ddd", "hQh">;
     def FMINNMH       : SInst<"vminnm", "ddd", "hQh">;
+  }
 
   // Multiplication/Division
   def VMULH         : SOpInst<"vmul", "ddd", "hQh", OP_MUL>;
 
   // Pairwise addition
   def VPADDH        : SInst<"vpadd", "ddd", "h">;
 
   // Pairwise Max/Min

test/Sema/arm-no-fp16.c

-// RUN: %clang_cc1 -triple thumbv7-none-eabi %s -target-feature +neon -target-feature -fp16 -fsyntax-only -verify
+// RUN: %clang_cc1 -triple thumbv7-none-eabi %s -target-feature +neon \
+// RUN:   -fallow-half-arguments-and-returns -target-feature -fp16 \
+// RUN:   -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'}}
 }
+
+float16x4_t test_vmaxnm_f16(float16x4_t a, float16x4_t b) {
+  return vmaxnm_f16(a, b); // expected-warning{{implicit declaration of function 'vmaxnm_f16'}} expected-error{{returning 'int' from a function with incompatible result type 'float16x4_t'}}
+}
+
+float16x8_t test_vmaxnmq_f16(float16x8_t a, float16x8_t b) {
+  return vmaxnmq_f16(a, b); // expected-warning{{implicit declaration of function 'vmaxnmq_f16'}} expected-error{{returning 'int' from a function with incompatible result type 'float16x8_t'}}
+}
+
+float16x4_t test_vminnm_f16(float16x4_t a, float16x4_t b) {
+  return vminnm_f16(a, b); // expected-warning{{implicit declaration of function 'vminnm_f16'}} expected-error{{returning 'int' from a function with incompatible result type 'float16x4_t'}}
+}
+
+float16x8_t test_vminnmq_f16(float16x8_t a, float16x8_t b) {
+  return vminnmq_f16(a, b); // expected-warning{{implicit declaration of function 'vminnmq_f16'}} expected-error{{returning 'int' from a function with incompatible result type 'float16x8_t'}}
+}