diff --git a/src/librustc_back/target/i686_apple_darwin.rs b/src/librustc_back/target/i686_apple_darwin.rs
index 98f4654ecab41..c05ff1fe91590 100644
--- a/src/librustc_back/target/i686_apple_darwin.rs
+++ b/src/librustc_back/target/i686_apple_darwin.rs
@@ -12,7 +12,9 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::apple_base::opts();
-    base.cpu = "yonah".to_string();
+    // Use i686 as default CPU. Clang uses the same default.
+    base.cpu = "i686".to_string();
+
     base.pre_link_args.push("-m32".to_string());
 
     Target {
diff --git a/src/librustc_back/target/i686_linux_android.rs b/src/librustc_back/target/i686_linux_android.rs
index f548fdad3cbed..77e481781968c 100644
--- a/src/librustc_back/target/i686_linux_android.rs
+++ b/src/librustc_back/target/i686_linux_android.rs
@@ -12,7 +12,11 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::android_base::opts();
-    base.cpu = "pentium4".to_string();
+
+    // Use i686 as default CPU and enable SSSE3.
+    // Clang and GCC do the same.
+    base.cpu = "i686".to_string();
+    base.features = "+ssse3".to_string();
 
     Target {
         llvm_target: "i686-linux-android".to_string(),
diff --git a/src/librustc_back/target/i686_pc_windows_gnu.rs b/src/librustc_back/target/i686_pc_windows_gnu.rs
index fa12bbd89323c..37999f9ce4b3f 100644
--- a/src/librustc_back/target/i686_pc_windows_gnu.rs
+++ b/src/librustc_back/target/i686_pc_windows_gnu.rs
@@ -12,6 +12,9 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::windows_base::opts();
+
+    // Use pentium4 as default CPU to enable SSE[2] instructions.
+    // Clang uses the same default.
     base.cpu = "pentium4".to_string();
 
     // Mark all dynamic libraries and executables as compatible with the larger 4GiB address
diff --git a/src/librustc_back/target/i686_pc_windows_msvc.rs b/src/librustc_back/target/i686_pc_windows_msvc.rs
index 7fe6590618941..e116d43eab712 100644
--- a/src/librustc_back/target/i686_pc_windows_msvc.rs
+++ b/src/librustc_back/target/i686_pc_windows_msvc.rs
@@ -12,6 +12,9 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::windows_msvc_base::opts();
+
+    // Use pentium4 as default CPU to enable SSE[2] instructions.
+    // Clang uses the same default.
     base.cpu = "pentium4".to_string();
 
     // Mark all dynamic libraries and executables as compatible with the larger 4GiB address
diff --git a/src/librustc_back/target/i686_unknown_dragonfly.rs b/src/librustc_back/target/i686_unknown_dragonfly.rs
index 32a15b9f2d4d1..95a3ee9fd17c7 100644
--- a/src/librustc_back/target/i686_unknown_dragonfly.rs
+++ b/src/librustc_back/target/i686_unknown_dragonfly.rs
@@ -12,7 +12,11 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::dragonfly_base::opts();
+
+    // Use pentium4 as default CPU to enable SSE[2] instructions.
+    // Clang uses the same default.
     base.cpu = "pentium4".to_string();
+
     base.pre_link_args.push("-m32".to_string());
 
     Target {
diff --git a/src/librustc_back/target/i686_unknown_freebsd.rs b/src/librustc_back/target/i686_unknown_freebsd.rs
index 812ba11cd796b..d24f93860ef08 100644
--- a/src/librustc_back/target/i686_unknown_freebsd.rs
+++ b/src/librustc_back/target/i686_unknown_freebsd.rs
@@ -12,7 +12,10 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::freebsd_base::opts();
-    base.cpu = "pentium4".to_string();
+
+    // Use i486 as default CPU. Clang uses the same default.
+    base.cpu = "i486".to_string();
+
     base.pre_link_args.push("-m32".to_string());
 
     Target {
diff --git a/src/librustc_back/target/i686_unknown_linux_gnu.rs b/src/librustc_back/target/i686_unknown_linux_gnu.rs
index ac2af0c64fd6a..3a0ee748da5e5 100644
--- a/src/librustc_back/target/i686_unknown_linux_gnu.rs
+++ b/src/librustc_back/target/i686_unknown_linux_gnu.rs
@@ -12,7 +12,11 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::linux_base::opts();
+
+    // Use pentium4 as default CPU to enable SSE[2] instructions.
+    // Clang uses the same default.
     base.cpu = "pentium4".to_string();
+
     base.pre_link_args.push("-m32".to_string());
 
     Target {
diff --git a/src/librustc_back/target/i686_unknown_linux_musl.rs b/src/librustc_back/target/i686_unknown_linux_musl.rs
index 77bc7bb51755d..f987ad2a313b2 100644
--- a/src/librustc_back/target/i686_unknown_linux_musl.rs
+++ b/src/librustc_back/target/i686_unknown_linux_musl.rs
@@ -14,7 +14,11 @@ use target::Target;
 
 pub fn target() -> Target {
     let mut base = super::linux_base::opts();
+
+    // Use pentium4 as default CPU to enable SSE[2] instructions.
+    // Clang uses the same default.
     base.cpu = "pentium4".to_string();
+
     base.pre_link_args.push("-m32".to_string());
     base.pre_link_args.push("-Wl,-melf_i386".to_string());