vendor/llvm/llvm-trunk-r154661

1 files changed, 59 insertions, 17 deletions

diff --git a/test/CodeGen/X86/shift-folding.ll b/test/CodeGen/X86/shift-folding.ll
index d9c3061ff687..3ea601147bb0 100644
--- a/test/CodeGen/X86/shift-folding.ll
+++ b/test/CodeGen/X86/shift-folding.ll
@@ -1,28 +1,70 @@
-; RUN: llc < %s -march=x86 | \
-; RUN:   grep {s\[ah\]\[rl\]l} | count 1
+; RUN: llc < %s -march=x86 | FileCheck %s
 
-define i32* @test1(i32* %P, i32 %X) nounwind {
-        %Y = lshr i32 %X, 2             ; <i32> [#uses=1]
-        %gep.upgrd.1 = zext i32 %Y to i64               ; <i64> [#uses=1]
-        %P2 = getelementptr i32* %P, i64 %gep.upgrd.1           ; <i32*> [#uses=1]
-        ret i32* %P2
+define i32* @test1(i32* %P, i32 %X) {
+; CHECK: test1:
+; CHECK-NOT: shrl
+; CHECK-NOT: shll
+; CHECK: ret
+
+entry:
+  %Y = lshr i32 %X, 2
+  %gep.upgrd.1 = zext i32 %Y to i64
+  %P2 = getelementptr i32* %P, i64 %gep.upgrd.1
+  ret i32* %P2
 }
 
-define i32* @test2(i32* %P, i32 %X) nounwind {
-        %Y = shl i32 %X, 2              ; <i32> [#uses=1]
-        %gep.upgrd.2 = zext i32 %Y to i64               ; <i64> [#uses=1]
-        %P2 = getelementptr i32* %P, i64 %gep.upgrd.2           ; <i32*> [#uses=1]
-        ret i32* %P2
+define i32* @test2(i32* %P, i32 %X) {
+; CHECK: test2:
+; CHECK: shll $4
+; CHECK-NOT: shll
+; CHECK: ret
+
+entry:
+  %Y = shl i32 %X, 2
+  %gep.upgrd.2 = zext i32 %Y to i64
+  %P2 = getelementptr i32* %P, i64 %gep.upgrd.2
+  ret i32* %P2
 }
 
-define i32* @test3(i32* %P, i32 %X) nounwind {
-        %Y = ashr i32 %X, 2             ; <i32> [#uses=1]
-        %P2 = getelementptr i32* %P, i32 %Y             ; <i32*> [#uses=1]
-        ret i32* %P2
+define i32* @test3(i32* %P, i32 %X) {
+; CHECK: test3:
+; CHECK-NOT: shrl
+; CHECK-NOT: shll
+; CHECK: ret
+
+entry:
+  %Y = ashr i32 %X, 2
+  %P2 = getelementptr i32* %P, i32 %Y
+  ret i32* %P2
 }
 
-define fastcc i32 @test4(i32* %d) nounwind {
+define fastcc i32 @test4(i32* %d) {
+; CHECK: test4:
+; CHECK-NOT: shrl
+; CHECK: ret
+
+entry:
   %tmp4 = load i32* %d
   %tmp512 = lshr i32 %tmp4, 24
   ret i32 %tmp512
 }
+
+define i64 @test5(i16 %i, i32* %arr) {
+; Ensure that we don't fold away shifts which have multiple uses, as they are
+; just re-introduced for the second use.
+; CHECK: test5:
+; CHECK-NOT: shrl
+; CHECK: shrl $11
+; CHECK-NOT: shrl
+; CHECK: ret
+
+entry:
+  %i.zext = zext i16 %i to i32
+  %index = lshr i32 %i.zext, 11
+  %index.zext = zext i32 %index to i64
+  %val.ptr = getelementptr inbounds i32* %arr, i64 %index.zext
+  %val = load i32* %val.ptr
+  %val.zext = zext i32 %val to i64
+  %sum = add i64 %val.zext, %index.zext
+  ret i64 %sum
+}