Rematerialization logic was overly conservative when it comes to loads from fixed stack slots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47529 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 49 insertions, 0 deletions

diff --git a/test/CodeGen/X86/2008-02-22-ReMatBug.ll b/test/CodeGen/X86/2008-02-22-ReMatBug.ll
new file mode 100644
index 0000000..c26c19e
--- /dev/null
+++ b/test/CodeGen/X86/2008-02-22-ReMatBug.ll
@@ -0,0 +1,49 @@
+; RUN: llvm-as < %s | llc -march=x86 -stats |& grep {Number of re-materialization} | grep 3
+; rdar://5761454
+
+	%struct.quad_struct = type { i32, i32, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct* }
+
+define fastcc %struct.quad_struct* @MakeTree(i32 %size, i32 %center_x, i32 %center_y, i32 %lo_proc, i32 %hi_proc, %struct.quad_struct* %parent, i32 %ct, i32 %level) nounwind  {
+entry:
+	br i1 true, label %bb43.i, label %bb.i
+
+bb.i:		; preds = %entry
+	ret %struct.quad_struct* null
+
+bb43.i:		; preds = %entry
+	br i1 true, label %CheckOutside.exit40.i, label %bb11.i38.i
+
+bb11.i38.i:		; preds = %bb43.i
+	ret %struct.quad_struct* null
+
+CheckOutside.exit40.i:		; preds = %bb43.i
+	br i1 true, label %CheckOutside.exit30.i, label %bb11.i28.i
+
+bb11.i28.i:		; preds = %CheckOutside.exit40.i
+	ret %struct.quad_struct* null
+
+CheckOutside.exit30.i:		; preds = %CheckOutside.exit40.i
+	br i1 true, label %CheckOutside.exit20.i, label %bb11.i18.i
+
+bb11.i18.i:		; preds = %CheckOutside.exit30.i
+	ret %struct.quad_struct* null
+
+CheckOutside.exit20.i:		; preds = %CheckOutside.exit30.i
+	br i1 true, label %bb34, label %bb11.i8.i
+
+bb11.i8.i:		; preds = %CheckOutside.exit20.i
+	ret %struct.quad_struct* null
+
+bb34:		; preds = %CheckOutside.exit20.i
+	%tmp15.reg2mem.0 = sdiv i32 %size, 2		; <i32> [#uses=7]
+	%tmp85 = sub i32 %center_y, %tmp15.reg2mem.0		; <i32> [#uses=2]
+	%tmp88 = sub i32 %center_x, %tmp15.reg2mem.0		; <i32> [#uses=2]
+	%tmp92 = tail call fastcc %struct.quad_struct* @MakeTree( i32 %tmp15.reg2mem.0, i32 %tmp88, i32 %tmp85, i32 0, i32 %hi_proc, %struct.quad_struct* null, i32 2, i32 0 ) nounwind 		; <%struct.quad_struct*> [#uses=0]
+	%tmp99 = add i32 0, %hi_proc		; <i32> [#uses=1]
+	%tmp100 = sdiv i32 %tmp99, 2		; <i32> [#uses=1]
+	%tmp110 = tail call fastcc %struct.quad_struct* @MakeTree( i32 %tmp15.reg2mem.0, i32 0, i32 %tmp85, i32 0, i32 %tmp100, %struct.quad_struct* null, i32 3, i32 0 ) nounwind 		; <%struct.quad_struct*> [#uses=0]
+	%tmp122 = add i32 %tmp15.reg2mem.0, %center_y		; <i32> [#uses=2]
+	%tmp129 = tail call fastcc %struct.quad_struct* @MakeTree( i32 %tmp15.reg2mem.0, i32 0, i32 %tmp122, i32 0, i32 0, %struct.quad_struct* null, i32 1, i32 0 ) nounwind 		; <%struct.quad_struct*> [#uses=0]
+	%tmp147 = tail call fastcc %struct.quad_struct* @MakeTree( i32 %tmp15.reg2mem.0, i32 %tmp88, i32 %tmp122, i32 %lo_proc, i32 0, %struct.quad_struct* null, i32 0, i32 0 ) nounwind 		; <%struct.quad_struct*> [#uses=0]
+	unreachable
+}