Move a DenseMap's declaration outside of a loop, and just call

[oota-llvm.git] / test / Transforms / InstCombine / bit-tracking.ll

diff --git a/test/Transforms/InstCombine/bit-tracking.ll b/test/Transforms/InstCombine/bit-tracking.ll
index 10d1cc2ed61e5c25ef842e33a6b55b16876b1efe..d090c69d7f3c3ad2d677b41ec411cac03d1504a2 100644 (file)
--- a/test/Transforms/InstCombine/bit-tracking.ll
+++ b/test/Transforms/InstCombine/bit-tracking.ll
@@ -1,18 +1,26 @@
 ; This file contains various testcases that require tracking whether bits are
 ; set or cleared by various instructions.
+; RUN: llvm-as < %s | opt -instcombine -instcombine | llvm-dis |\
+; RUN:   not grep %ELIM
 
-; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep %ELIM
+; Reduce down to a single XOR
+define i32 @test3(i32 %B) {
+        %ELIMinc = and i32 %B, 1                ; <i32> [#uses=1]
+        %tmp.5 = xor i32 %ELIMinc, 1            ; <i32> [#uses=1]
+        %ELIM7 = and i32 %B, -2         ; <i32> [#uses=1]
+        %tmp.8 = or i32 %tmp.5, %ELIM7          ; <i32> [#uses=1]
+        ret i32 %tmp.8
+}
 
-; test1 - Eliminating the casts in this testcase (by narrowing the AND 
-; operation) allows instcombine to realize the function always returns false.
-;
-bool %test1(int %A, int %B) {
-        %C1 = setlt int %A, %B
-        %ELIM1 = cast bool %C1 to uint
-        %C2 = setgt int %A, %B
-        %ELIM2 = cast bool %C2 to uint
-        %C3 = and uint %ELIM1, %ELIM2
-        %ELIM3 = cast uint %C3 to bool
-        ret bool %ELIM3
+; Finally, a bigger case where we chain things together.  This corresponds to
+; incrementing a single-bit bitfield, which should become just an xor.
+define i32 @test4(i32 %B) {
+        %ELIM3 = shl i32 %B, 31         ; <i32> [#uses=1]
+        %ELIM4 = ashr i32 %ELIM3, 31            ; <i32> [#uses=1]
+        %inc = add i32 %ELIM4, 1                ; <i32> [#uses=1]
+        %ELIM5 = and i32 %inc, 1                ; <i32> [#uses=1]
+        %ELIM7 = and i32 %B, -2         ; <i32> [#uses=1]
+        %tmp.8 = or i32 %ELIM5, %ELIM7          ; <i32> [#uses=1]
+        ret i32 %tmp.8
 }