From fff98467f34ca1622b16bd68041934d85c35e53a Mon Sep 17 00:00:00 2001
From: gwenn <gtreguier@gmail.com>
Date: Sat, 30 Sep 2017 11:42:49 +0200
Subject: [PATCH] sse3: _mm_addsub_ps

---
 library/stdarch/src/x86/sse3.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/library/stdarch/src/x86/sse3.rs b/library/stdarch/src/x86/sse3.rs
index 3cca6fc32e01..7afbdc97824e 100644
--- a/library/stdarch/src/x86/sse3.rs
+++ b/library/stdarch/src/x86/sse3.rs
@@ -1,8 +1,18 @@
 use x86::__m128i;
+use v128::f32x4;
 
 #[cfg(test)]
 use stdsimd_test::assert_instr;
 
+/// Alternatively add and subtract packed single-precision (32-bit)
+/// floating-point elements in `a` to/from packed elements in `b`.
+#[inline(always)]
+#[target_feature = "+sse3"]
+#[cfg_attr(test, assert_instr(addsub))]
+pub unsafe fn _mm_addsub_ps(a: f32x4, b: f32x4) -> f32x4 {
+    addsubps(a, b)
+}
+
 /// Load 128-bits of integer data from unaligned memory.
 /// This intrinsic may perform better than `_mm_loadu_si128`
 /// when the data crosses a cache line boundary.
@@ -15,6 +25,8 @@ pub unsafe fn _mm_lddqu_si128(mem_addr: *const __m128i) -> __m128i {
 
 #[allow(improper_ctypes)]
 extern {
+    #[link_name = "llvm.x86.sse3.addsub.ps"]
+    fn addsubps(a: f32x4, b: f32x4) -> f32x4;
     #[link_name = "llvm.x86.sse3.ldu.dq"]
     fn lddqu(mem_addr: *const i8) -> __m128i;
 }
@@ -27,6 +39,14 @@ mod tests {
     use v128::*;
     use x86::sse3 as sse3;
 
+    #[simd_test = "sse3"]
+    unsafe fn _mm_addsub_ps() {
+        let a = f32x4::new(-1.0, 5.0, 0.0, -10.0);
+        let b = f32x4::new(-100.0, 20.0, 0.0, -5.0);
+        let r = sse3::_mm_addsub_ps(a, b);
+        assert_eq!(r, f32x4::new(99.0, 25.0, 0.0, -15.0));
+    }
+
     #[simd_test = "sse3"]
     unsafe fn _mm_lddqu_si128() {
         let a = i8x16::new(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);