Fix a number of byval / memcpy / memset related codegen issues.

1. x86-64 byval alignment should be max of 8 and alignment of type. Previously the code was not doing what the commit message was saying.
2. Do not use byte repeat move and store operations. These are slow.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55139 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 45 insertions, 0 deletions

diff --git a/test/CodeGen/X86/memset-2.ll b/test/CodeGen/X86/memset-2.ll
new file mode 100644
index 0000000000..2ad665cda7
--- /dev/null
+++ b/test/CodeGen/X86/memset-2.ll
@@ -0,0 +1,45 @@
+; RUN: llvm-as < %s | llc -march=x86 | not grep rep
+; RUN: llvm-as < %s | llc -march=x86 | grep memset
+
+declare void @llvm.memset.i32(i8*, i8, i32, i32) nounwind
+
+define fastcc i32 @cli_scanzip(i32 %desc) nounwind {
+entry:
+	br label %bb8.i.i.i.i
+
+bb8.i.i.i.i:		; preds = %bb8.i.i.i.i, %entry
+	icmp eq i32 0, 0		; <i1>:0 [#uses=1]
+	br i1 %0, label %bb61.i.i.i, label %bb8.i.i.i.i
+
+bb32.i.i.i:		; preds = %bb61.i.i.i
+	ptrtoint i8* %tail.0.i.i.i to i32		; <i32>:1 [#uses=1]
+	sub i32 0, %1		; <i32>:2 [#uses=1]
+	icmp sgt i32 %2, 19		; <i1>:3 [#uses=1]
+	br i1 %3, label %bb34.i.i.i, label %bb61.i.i.i
+
+bb34.i.i.i:		; preds = %bb32.i.i.i
+	load i32* null, align 4		; <i32>:4 [#uses=1]
+	icmp eq i32 %4, 101010256		; <i1>:5 [#uses=1]
+	br i1 %5, label %bb8.i11.i.i.i, label %bb61.i.i.i
+
+bb8.i11.i.i.i:		; preds = %bb8.i11.i.i.i, %bb34.i.i.i
+	icmp eq i32 0, 0		; <i1>:6 [#uses=1]
+	br i1 %6, label %cli_dbgmsg.exit49.i, label %bb8.i11.i.i.i
+
+cli_dbgmsg.exit49.i:		; preds = %bb8.i11.i.i.i
+	icmp eq [32768 x i8]* null, null		; <i1>:7 [#uses=1]
+	br i1 %7, label %bb1.i28.i, label %bb8.i.i
+
+bb61.i.i.i:		; preds = %bb61.i.i.i, %bb34.i.i.i, %bb32.i.i.i, %bb8.i.i.i.i
+	%tail.0.i.i.i = getelementptr [1024 x i8]* null, i32 0, i32 0		; <i8*> [#uses=2]
+	load i8* %tail.0.i.i.i, align 1		; <i8>:8 [#uses=1]
+	icmp eq i8 %8, 80		; <i1>:9 [#uses=1]
+	br i1 %9, label %bb32.i.i.i, label %bb61.i.i.i
+
+bb1.i28.i:		; preds = %cli_dbgmsg.exit49.i
+	call void @llvm.memset.i32( i8* null, i8 0, i32 88, i32 1 ) nounwind
+	unreachable
+
+bb8.i.i:		; preds = %bb8.i.i, %cli_dbgmsg.exit49.i
+	br label %bb8.i.i
+}