[clang] 187686b - [CodeGen] add test for NAN creation; NFC

[Sanjay Patel via cfe-commits]

Author: Sanjay Patel
Date: 2020-09-30T13:22:12-04:00
New Revision: 187686bea3878c0bf2b150d784e7eab223434e25

URL: https://github.com/llvm/llvm-project/commit/187686bea3878c0bf2b150d784e7eab223434e25
DIFF: https://github.com/llvm/llvm-project/commit/187686bea3878c0bf2b150d784e7eab223434e25.diff

LOG: [CodeGen] add test for NAN creation; NFC

This goes with the APFloat change proposed in
D88238.
This is copied from the MIPS-specific test in
builtin-nan-legacy.c to verify that the normal
behavior is correct on other targets without the
complication of an inverted quiet bit.

Added: 
    clang/test/CodeGen/builtin-nan-exception.c

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/clang/test/CodeGen/builtin-nan-exception.c b/clang/test/CodeGen/builtin-nan-exception.c
new file mode 100644
index 000000000000..2acf0c4390ec
--- /dev/null
+++ b/clang/test/CodeGen/builtin-nan-exception.c
@@ -0,0 +1,23 @@
+// RUN: %clang -target aarch64 -emit-llvm -S %s -o - | FileCheck %s
+// RUN: %clang -target lanai -emit-llvm -S %s -o - | FileCheck %s
+// RUN: %clang -target riscv64 -emit-llvm -S %s -o - | FileCheck %s
+// RUN: %clang -target x86_64 -emit-llvm -S %s -o - | FileCheck %s
+
+// Run a variety of targets to ensure there's no target-based 
diff erence.
+
+// The builtin always produces a 64-bit (double).
+// An SNaN with no payload is formed by setting the bit after the
+// the quiet bit (MSB of the significand).
+
+// CHECK: float 0x7FF8000000000000, float 0x7FF4000000000000
+// CHECK: double 0x7FF8000000000000, double 0x7FF4000000000000
+
+float f[] = {
+  __builtin_nan(""),
+  __builtin_nans(""),
+};
+
+double d[] = {
+  __builtin_nan(""),
+  __builtin_nans(""),
+};