summaryrefslogtreecommitdiffstats
path: root/llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll
diff options
context:
space:
mode:
authorAndrea Di Biagio <Andrea_DiBiagio@sn.scee.net>2015-02-20 19:37:14 +0000
committerAndrea Di Biagio <Andrea_DiBiagio@sn.scee.net>2015-02-20 19:37:14 +0000
commit7035178aebc91d0ed99759919865d6745ac052e2 (patch)
tree3e7e58561c265dc9c71c06d621b8ae9f48462d9d /llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll
parentf20413245a8667e105a8850ed68165d8ed13bde3 (diff)
downloadbcm5719-llvm-7035178aebc91d0ed99759919865d6745ac052e2.tar.gz
bcm5719-llvm-7035178aebc91d0ed99759919865d6745ac052e2.zip
[X86][FastIsel] Teach how to select float-half conversion intrinsics.
This patch teaches X86FastISel how to select intrinsic 'convert_from_fp16' and intrinsic 'convert_to_fp16'. If the target has F16C, we can select VCVTPS2PHrr for a float-half conversion, and VCVTPH2PSrr for a half-float conversion. Differential Revision: http://reviews.llvm.org/D7673 llvm-svn: 230043
Diffstat (limited to 'llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll')
-rw-r--r--llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll23
1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll b/llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll
new file mode 100644
index 00000000000..ade867b7d70
--- /dev/null
+++ b/llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll
@@ -0,0 +1,23 @@
+; RUN: llc -fast-isel -fast-isel-abort -mtriple=x86_64-unknown-unknown -mattr=+f16c < %s
+
+; XFAIL: *
+
+; In the future, we might want to teach fast-isel how to expand a double-to-half
+; conversion into a double-to-float conversion immediately followed by a
+; float-to-half conversion. For now, fast-isel is expected to fail.
+
+define double @test_fp16_to_fp64(i32 %a) {
+entry:
+ %0 = trunc i32 %a to i16
+ %1 = call double @llvm.convert.from.fp16.f64(i16 %0)
+ ret float %0
+}
+
+define i16 @test_fp64_to_fp16(double %a) {
+entry:
+ %0 = call i16 @llvm.convert.to.fp16.f64(double %a)
+ ret i16 %0
+}
+
+declare i16 @llvm.convert.to.fp16.f64(double)
+declare double @llvm.convert.from.fp16.f64(i16)
OpenPOWER on IntegriCloud