Default stack alignment for 32bit x86 should be 4 Bytes, not 8 Bytes.

Add a test that checks the stack alignment of a simple function for
Darwin, Linux and NetBSD for 32bit and 64bit mode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147888 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index d78003284abc17d0b252d9395fc24907f2185880..f4a6261973ed30327998cedf3883b65152ba72ff 100644 (file)
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -333,7 +333,7 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
   , IsUAMemFast(false)
   , HasVectorUAMem(false)
   , HasCmpxchg16b(false)
-  , stackAlignment(8)
+  , stackAlignment(4)
   // FIXME: this is a known good value for Yonah. How about others?
   , MaxInlineSizeThreshold(128)
   , TargetTriple(TT)

diff --git a/test/CodeGen/X86/stack-align2.ll b/test/CodeGen/X86/stack-align2.ll
new file mode 100644 (file)
index 0000000..5523c0e
--- /dev/null
+++ b/test/CodeGen/X86/stack-align2.ll
@@ -0,0 +1,25 @@
+; RUN: llc < %s -mtriple=i386-linux | FileCheck %s -check-prefix=LINUX-I386
+; RUN: llc < %s -mtriple=i386-netbsd | FileCheck %s -check-prefix=NETBSD-I386
+; RUN: llc < %s -mtriple=i686-apple-darwin8 | FileCheck %s -check-prefix=DARWIN-I386
+; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s -check-prefix=LINUX-X86_64
+; RUN: llc < %s -mtriple=x86_64-netbsd | FileCheck %s -check-prefix=NETBSD-X86_64
+; RUN: llc < %s -mtriple=x86_64-apple-darwin8 | FileCheck %s -check-prefix=DARWIN-X86_64
+
+define i32 @test() nounwind {
+entry:
+  call void @test2()
+  ret i32 0
+
+; LINUX-I386:     subl $12, %esp
+; DARWIN-I386:    subl $12, %esp
+; NETBSD-I386-NOT: subl        {{.*}}, %esp
+
+; LINUX-X86_64:      pushq %{{.*}}
+; LINUX-X86_64-NOT:  subq      {{.*}}, %rsp
+; DARWIN-X86_64:     pushq %{{.*}}
+; DARWIN-X86_64-NOT: subq      {{.*}}, %rsp
+; NETBSD-X86_64:     pushq %{{.*}}
+; NETBSD-X86_64-NOT: subq      {{.*}}, %rsp
+}
+
+declare void @test2()