handle equality memcmp of 8 bytes on x86-64 with two unaligned loads and a

[oota-llvm.git] / test / CodeGen / X86 / memcmp.ll

diff --git a/test/CodeGen/X86/memcmp.ll b/test/CodeGen/X86/memcmp.ll
index f6086c4fbe2c9500f83e2f2dc15fed2e36f325ec..b90d2e211878b9859d7969577a430113e4277a1b 100644 (file)
--- a/test/CodeGen/X86/memcmp.ll
+++ b/test/CodeGen/X86/memcmp.ll
@@ -3,7 +3,7 @@
 ; This tests codegen time inlining/optimization of memcmp
 ; rdar://6480398
 
-@.str = private constant [6 x i8] c"fooxx\00", align 1 ; <[6 x i8]*> [#uses=1]
+@.str = private constant [23 x i8] c"fooooooooooooooooooooo\00", align 1 ; <[23 x i8]*> [#uses=1]
 
 declare i32 @memcmp(...)
 
@@ -26,7 +26,7 @@ return:                                           ; preds = %entry
 
 define void @memcmp2a(i8* %X, i32* nocapture %P) nounwind {
 entry:
-  %0 = tail call i32 (...)* @memcmp(i8* %X, i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 1), i32 2) nounwind ; <i32> [#uses=1]
+  %0 = tail call i32 (...)* @memcmp(i8* %X, i8* getelementptr inbounds ([23 x i8]* @.str, i32 0, i32 1), i32 2) nounwind ; <i32> [#uses=1]
   %1 = icmp eq i32 %0, 0                          ; <i1> [#uses=1]
   br i1 %1, label %return, label %bb
 
@@ -60,7 +60,7 @@ return:                                           ; preds = %entry
 
 define void @memcmp4a(i8* %X, i32* nocapture %P) nounwind {
 entry:
-  %0 = tail call i32 (...)* @memcmp(i8* %X, i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 1), i32 4) nounwind ; <i32> [#uses=1]
+  %0 = tail call i32 (...)* @memcmp(i8* %X, i8* getelementptr inbounds ([23 x i8]* @.str, i32 0, i32 1), i32 4) nounwind ; <i32> [#uses=1]
   %1 = icmp eq i32 %0, 0                          ; <i1> [#uses=1]
   br i1 %1, label %return, label %bb
 
@@ -71,6 +71,40 @@ bb:                                               ; preds = %entry
 return:                                           ; preds = %entry
   ret void
 ; CHECK: memcmp4a:
-; CHECK: cmpl $2021158767, (%rdi)
+; CHECK: cmpl $1869573999, (%rdi)
+}
+
+define void @memcmp8(i8* %X, i8* %Y, i32* nocapture %P) nounwind {
+entry:
+  %0 = tail call i32 (...)* @memcmp(i8* %X, i8* %Y, i32 8) nounwind ; <i32> [#uses=1]
+  %1 = icmp eq i32 %0, 0                          ; <i1> [#uses=1]
+  br i1 %1, label %return, label %bb
+
+bb:                                               ; preds = %entry
+  store i32 4, i32* %P, align 4
+  ret void
+
+return:                                           ; preds = %entry
+  ret void
+; CHECK: memcmp8:
+; CHECK: movq    (%rsi), %rax
+; CHECK: cmpq    %rax, (%rdi)
+}
+
+define void @memcmp8a(i8* %X, i32* nocapture %P) nounwind {
+entry:
+  %0 = tail call i32 (...)* @memcmp(i8* %X, i8* getelementptr inbounds ([23 x i8]* @.str, i32 0, i32 0), i32 8) nounwind ; <i32> [#uses=1]
+  %1 = icmp eq i32 %0, 0                          ; <i1> [#uses=1]
+  br i1 %1, label %return, label %bb
+
+bb:                                               ; preds = %entry
+  store i32 4, i32* %P, align 4
+  ret void
+
+return:                                           ; preds = %entry
+  ret void
+; CHECK: memcmp8a:
+; CHECK: movabsq $8029759185026510694, %rax
+; CHECK: cmpq  %rax, (%rdi)
 }