Regression is gone, don't try to find it on clean target.

llvm-svn: 33296

1 files changed, 74 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/mul.ll b/llvm/test/Transforms/InstCombine/mul.ll
new file mode 100644
index 00000000000..ccec6b894a7
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/mul.ll
@@ -0,0 +1,74 @@
+; This test makes sure that mul instructions are properly eliminated.
+;
+
+; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | not grep mul
+
+implementation
+
+int %test1(int %A) {
+	%B = mul int %A, 1
+	ret int %B
+}
+
+int %test2(int %A) {
+	%B = mul int %A, 2   ; Should convert to an add instruction
+	ret int %B
+}
+
+int %test3(int %A) {
+	%B = mul int %A, 0   ; This should disappear entirely
+	ret int %B
+}
+
+double %test4(double %A) {
+	%B = mul double 1.0, %A   ; This is safe for FP
+	ret double %B
+}
+
+int %test5(int %A) {
+	%B = mul int %A, 8
+	ret int %B
+}
+
+ubyte %test6(ubyte %A) {
+	%B = mul ubyte %A, 8
+	%C = mul ubyte %B, 8
+	ret ubyte %C
+}
+
+int %test7(int %i) {
+        %tmp = mul int %i, -1   ; %tmp = sub 0, %i
+        ret int %tmp
+}
+
+ulong %test8(ulong %i) {
+	%j = mul ulong %i, 18446744073709551615 ; tmp = sub 0, %i
+	ret ulong %j
+}
+
+uint %test9(uint %i) {
+	%j = mul uint %i, 4294967295    ; %j = sub 0, %i
+	ret uint %j
+}
+
+uint %test10(int %a, uint %b) {
+	%c = setlt int %a, 0
+	%d = cast bool %c to uint
+	%e = mul uint %d, %b           ; e = b & (a >> 31)
+	ret uint %e
+}
+
+uint %test11(int %a, uint %b) {
+	%c = setle int %a, -1
+	%d = cast bool %c to uint
+	%e = mul uint %d, %b           ; e = b & (a >> 31)
+	ret uint %e
+}
+
+uint %test11(ubyte %a, uint %b) {
+	%c = setgt ubyte %a, 127
+	%d = cast bool %c to uint
+	%e = mul uint %d, %b           ; e = b & (a >> 31)
+	ret uint %e
+}
+