align-byval test: add cases for <= align 4

Author: erikdesjardins

tests/codegen/align-byval.rs

@@ -29,6 +29,19 @@
 impl Copy for i32 {}
 impl Copy for i64 {}
 
+#[repr(C)]
+pub struct NaturalAlign2 {
+    a: [i16; 16],
+    b: i16,
+}
+
+#[repr(C)]
+#[repr(align(4))]
+pub struct ForceAlign4 {
+    a: [i8; 16],
+    b: i8,
+}
+
 // on i686-windows, this should be passed on stack using `byval`
 #[repr(C)]
 pub struct NaturalAlign8 {
@@ -37,7 +50,7 @@ pub struct NaturalAlign8 {
     c: i64
 }
 
-// on i686-windows, this should be passed by reference (because the alignment is requested/forced),
+// on i686-windows, this is passed by reference (because alignment is >4 and requested/forced),
 // even though it has the exact same layout as `NaturalAlign8` (!!!)
 #[repr(C)]
 #[repr(align(8))]
@@ -55,6 +68,36 @@ pub struct ForceAlign16 {
 }
 
 extern "C" {
+    // m68k: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 2{{.*}})
+
+    // wasm: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 2{{.*}})
+
+    // x86_64-linux: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 2{{.*}})
+
+    // x86_64-windows: declare void @natural_align_2(
+    // x86_64-windows-NOT: byval
+    // x86_64-windows-SAME: align 2{{.*}})
+
+    // i686-linux: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 4{{.*}})
+
+    // i686-windows: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 4{{.*}})
+    fn natural_align_2(a: NaturalAlign2);
+
+    // m68k: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
+
+    // wasm: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
+
+    // x86_64-linux: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
+
+    // x86_64-windows: declare void @force_align_4(
+    // x86_64-windows-NOT: byval
+    // x86_64-windows-SAME: align 4{{.*}})
+
+    // i686-linux: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
+
+    // i686-windows: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
+    fn force_align_4(b: ForceAlign4);
+
     // m68k: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 4{{.*}})
 
     // wasm: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 8{{.*}})
@@ -105,7 +148,12 @@ extern "C" {
     fn force_align_16(z: ForceAlign16);
 }
 
-pub unsafe fn main(x: NaturalAlign8, y: ForceAlign8, z: ForceAlign16) {
+pub unsafe fn main(
+    a: NaturalAlign2, b: ForceAlign4,
+    x: NaturalAlign8, y: ForceAlign8, z: ForceAlign16
+) {
+    natural_align_2(a);
+    force_align_4(b);
     natural_align_8(x);
     force_align_8(y);
     force_align_16(z);