Re-apply the infamous r108614, with a fix pointed out by Dirk Steinke.

llvm-svn: 110036

1 files changed, 26 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/bit-checks.ll b/llvm/test/Transforms/InstCombine/bit-checks.ll
new file mode 100644
index 00000000000..d774c0972de
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/bit-checks.ll
@@ -0,0 +1,26 @@
+; This test makes sure that these instructions are properly eliminated.
+;
+; RUN: opt < %s -instcombine -S | \
+; RUN:    not grep {tobool}
+; END.
+define i32 @main(i32 %argc, i8** %argv) nounwind ssp {
+entry:
+  %and = and i32 %argc, 1                         ; <i32> [#uses=1]
+  %tobool = icmp ne i32 %and, 0                   ; <i1> [#uses=1]
+  %and2 = and i32 %argc, 2                        ; <i32> [#uses=1]
+  %tobool3 = icmp ne i32 %and2, 0                 ; <i1> [#uses=1]
+  %or.cond = and i1 %tobool, %tobool3             ; <i1> [#uses=1]
+  %retval.0 = select i1 %or.cond, i32 2, i32 1    ; <i32> [#uses=1]
+  ret i32 %retval.0
+}
+
+define i32 @main2(i32 %argc, i8** nocapture %argv) nounwind readnone ssp {
+entry:
+  %and = and i32 %argc, 1                         ; <i32> [#uses=1]
+  %tobool = icmp eq i32 %and, 0                   ; <i1> [#uses=1]
+  %and2 = and i32 %argc, 2                        ; <i32> [#uses=1]
+  %tobool3 = icmp eq i32 %and2, 0                 ; <i1> [#uses=1]
+  %or.cond = or i1 %tobool, %tobool3              ; <i1> [#uses=1]
+  %storemerge = select i1 %or.cond, i32 0, i32 1  ; <i32> [#uses=1]
+  ret i32 %storemerge
+}
\ No newline at end of file