diff --git a/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr.cpp b/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr.cpp
--- a/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr.cpp
+++ b/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr.cpp
@@ -162,7 +162,7 @@
   case 'm':
     // CHECK-MEMBER: vptr.cpp:[[@LINE+6]]:15: runtime error: member access within address [[PTR:0x[0-9a-f]*]] which does not point to an object of type 'T'
     // CHECK-MEMBER-NEXT: [[PTR]]: note: object is of type [[DYN_TYPE:'S'|'U']]
-    // CHECK-MEMBER-NEXT: {{^ .. .. .. ..  .. .. .. .. .. .. .. ..  }}
+    // CHECK-MEMBER-NEXT: {{^  ?.. .. .. ..  ?.. .. .. ..  ?.. .. .. ..  ?}}
     // CHECK-MEMBER-NEXT: {{^              \^~~~~~~~~~~(~~~~~~~~~~~~)? *$}}
     // CHECK-MEMBER-NEXT: {{^              vptr for}} [[DYN_TYPE]]
     // CHECK-Linux-MEMBER: #0 {{.*}}access_p{{.*}}vptr.cpp:[[@LINE+1]]
@@ -178,7 +178,7 @@
   case 'f':
     // CHECK-MEMFUN: vptr.cpp:[[@LINE+6]]:15: runtime error: member call on address [[PTR:0x[0-9a-f]*]] which does not point to an object of type 'T'
     // CHECK-MEMFUN-NEXT: [[PTR]]: note: object is of type [[DYN_TYPE:'S'|'U']]
-    // CHECK-MEMFUN-NEXT: {{^ .. .. .. ..  .. .. .. .. .. .. .. ..  }}
+    // CHECK-MEMFUN-NEXT: {{^  ?.. .. .. ..  ?.. .. .. ..  ?.. .. .. ..  ?}}
     // CHECK-MEMFUN-NEXT: {{^              \^~~~~~~~~~~(~~~~~~~~~~~~)? *$}}
     // CHECK-MEMFUN-NEXT: {{^              vptr for}} [[DYN_TYPE]]
     // TODO: Add check for stacktrace here.
@@ -196,7 +196,7 @@
   case 'c':
     // CHECK-DOWNCAST: vptr.cpp:[[@LINE+6]]:11: runtime error: downcast of address [[PTR:0x[0-9a-f]*]] which does not point to an object of type 'T'
     // CHECK-DOWNCAST-NEXT: [[PTR]]: note: object is of type [[DYN_TYPE:'S'|'U']]
-    // CHECK-DOWNCAST-NEXT: {{^ .. .. .. ..  .. .. .. .. .. .. .. ..  }}
+    // CHECK-DOWNCAST-NEXT: {{^  ?.. .. .. ..  ?.. .. .. ..  ?.. .. .. ..  ?}}
     // CHECK-DOWNCAST-NEXT: {{^              \^~~~~~~~~~~(~~~~~~~~~~~~)? *$}}
     // CHECK-DOWNCAST-NEXT: {{^              vptr for}} [[DYN_TYPE]]
     // CHECK-Linux-DOWNCAST: #0 {{.*}}access_p{{.*}}vptr.cpp:[[@LINE+1]]
diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -258,12 +258,13 @@
     report_fatal_error("64-bit code requested on a subtarget that doesn't "
                        "support it!");
 
-  // Stack alignment is 16 bytes on Darwin, Linux, kFreeBSD and Solaris (both
-  // 32 and 64 bit) and for all 64-bit targets.
+  // Stack alignment is 16 bytes on Darwin, Linux, kFreeBSD and for all
+  // 64-bit targets.  On Solaris (32-bit), stack alignment is 4 bytes
+  // following the i386 psABI, while on Illumos it is always 16 bytes.
   if (StackAlignOverride)
     stackAlignment = *StackAlignOverride;
-  else if (isTargetDarwin() || isTargetLinux() || isTargetSolaris() ||
-           isTargetKFreeBSD() || In64BitMode)
+  else if (isTargetDarwin() || isTargetLinux() || isTargetKFreeBSD() ||
+           In64BitMode)
     stackAlignment = Align(16);
 
   // Consume the vector width attribute or apply any target specific limit.
diff --git a/llvm/test/CodeGen/X86/stack-align2.ll b/llvm/test/CodeGen/X86/stack-align2.ll
--- a/llvm/test/CodeGen/X86/stack-align2.ll
+++ b/llvm/test/CodeGen/X86/stack-align2.ll
@@ -2,10 +2,12 @@
 ; RUN: llc < %s -mcpu=generic -mtriple=i386-kfreebsd | FileCheck %s -check-prefix=KFREEBSD-I386
 ; RUN: llc < %s -mcpu=generic -mtriple=i386-netbsd | FileCheck %s -check-prefix=NETBSD-I386
 ; RUN: llc < %s -mcpu=generic -mtriple=i686-apple-darwin8 | FileCheck %s -check-prefix=DARWIN-I386
+; RUN: llc < %s -mcpu=generic -mtriple=i386-pc-solaris2.11 | FileCheck %s -check-prefix=SOLARIS-I386
 ; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux | FileCheck %s -check-prefix=LINUX-X86_64
 ; RUN: llc < %s -mcpu=generic -mtriple=x86_64-kfreebsd | FileCheck %s -check-prefix=KFREEBSD-X86_64
 ; RUN: llc < %s -mcpu=generic -mtriple=x86_64-netbsd | FileCheck %s -check-prefix=NETBSD-X86_64
 ; RUN: llc < %s -mcpu=generic -mtriple=x86_64-apple-darwin8 | FileCheck %s -check-prefix=DARWIN-X86_64
+; RUN: llc < %s -mcpu=generic -mtriple=x86_64-pc-solaris2.11 | FileCheck %s -check-prefix=SOLARIS-X86_64
 
 define i32 @test() nounwind {
 entry:
@@ -15,7 +17,8 @@
 ; LINUX-I386:     subl	$12, %esp
 ; KFREEBSD-I386:  subl	$12, %esp
 ; DARWIN-I386:    subl	$12, %esp
-; NETBSD-I386-NOT: subl	{{.*}}, %esp
+; NETBSD-I386-NOT:  subl	{{.*}}, %esp
+; SOLARIS-I386-NOT: subl	{{.*}}, %esp
 
 ; LINUX-X86_64:      pushq %{{.*}}
 ; LINUX-X86_64-NOT:  subq	{{.*}}, %rsp
@@ -23,6 +26,8 @@
 ; DARWIN-X86_64-NOT: subq	{{.*}}, %rsp
 ; NETBSD-X86_64:     pushq %{{.*}}
 ; NETBSD-X86_64-NOT: subq	{{.*}}, %rsp
+; SOLARIS-X86_64:     pushq %{{.*}}
+; SOLARIS-X86_64-NOT: subq	{{.*}}, %rsp
 ; KFREEBSD-X86_64:     pushq %{{.*}}
 ; KFREEBSD-X86_64-NOT: subq	{{.*}}, %rsp
 }