Test case for PR454

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18301 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2004-11-27-SetCCForCastLargerAndConstant.ll b/test/Transforms/InstCombine/2004-11-27-SetCCForCastLargerAndConstant.ll
new file mode 100644 (file)
index 0000000..b04d544
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+++ b/test/Transforms/InstCombine/2004-11-27-SetCCForCastLargerAndConstant.ll
@@ -0,0 +1,159 @@
+; This test case tests the InstructionCombining optimization that
+; reduces things like:
+;   %Y = cast sbyte %X to uint
+;   %C = setlt uint %Y, 1024
+; to
+;   %C = bool true
+; It includes test cases for different constant values, signedness of the
+; cast operands, and types of setCC operators. In all cases, the cast should
+; be eliminated. In many cases the setCC is also eliminated based on the
+; constant value and the range of the casted value.
+;
+; RUN: llvm-as %s -o - | opt -instcombine -o - | llvm-dis -o - | grep -v cast
+
+implementation   ; Functions:
+
+; 
+bool %lt_signed_to_large_unsigned(sbyte %SB) {
+  %Y = cast sbyte %SB to uint          ; <uint> [#uses=1]
+  %C = setlt uint %Y, 1024             ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %lt_signed_to_large_signed(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setlt int %Y, 1024
+  ret bool %C
+}
+
+bool %lt_signed_to_large_negative(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setlt int %Y, -1024
+  ret bool %C
+}
+
+bool %lt_signed_to_small_unsigned(sbyte %SB) {
+  %Y = cast sbyte %SB to uint          ; <uint> [#uses=1]
+  %C = setlt uint %Y, 17               ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %lt_signed_to_small_signed(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setlt int %Y, 17
+  ret bool %C
+}
+
+bool %lt_signed_to_small_negative(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setlt int %Y, -17
+  ret bool %C
+}
+
+bool %lt_unsigned_to_large_unsigned(ubyte %SB) {
+  %Y = cast ubyte %SB to uint          ; <uint> [#uses=1]
+  %C = setlt uint %Y, 1024             ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %lt_unsigned_to_large_signed(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setlt int %Y, 1024
+  ret bool %C
+}
+
+bool %lt_unsigned_to_large_negative(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setlt int %Y, -1024
+  ret bool %C
+}
+
+bool %lt_unsigned_to_small_unsigned(ubyte %SB) {
+  %Y = cast ubyte %SB to uint          ; <uint> [#uses=1]
+  %C = setlt uint %Y, 17               ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %lt_unsigned_to_small_signed(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setlt int %Y, 17
+  ret bool %C
+}
+
+bool %lt_unsigned_to_small_negative(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setlt int %Y, -17
+  ret bool %C
+}
+
+bool %gt_signed_to_large_unsigned(sbyte %SB) {
+  %Y = cast sbyte %SB to uint          ; <uint> [#uses=1]
+  %C = setgt uint %Y, 1024             ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %gt_signed_to_large_signed(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setgt int %Y, 1024
+  ret bool %C
+}
+
+bool %gt_signed_to_large_negative(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setgt int %Y, -1024
+  ret bool %C
+}
+
+bool %gt_signed_to_small_unsigned(sbyte %SB) {
+  %Y = cast sbyte %SB to uint          ; <uint> [#uses=1]
+  %C = setgt uint %Y, 17               ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %gt_signed_to_small_signed(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setgt int %Y, 17
+  ret bool %C
+}
+
+bool %gt_signed_to_small_negative(sbyte %SB) {
+  %Y = cast sbyte %SB to int
+  %C = setgt int %Y, -17
+  ret bool %C
+}
+
+bool %gt_unsigned_to_large_unsigned(ubyte %SB) {
+  %Y = cast ubyte %SB to uint          ; <uint> [#uses=1]
+  %C = setgt uint %Y, 1024             ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %gt_unsigned_to_large_signed(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setgt int %Y, 1024
+  ret bool %C
+}
+
+bool %gt_unsigned_to_large_negative(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setgt int %Y, -1024
+  ret bool %C
+}
+
+bool %gt_unsigned_to_small_unsigned(ubyte %SB) {
+  %Y = cast ubyte %SB to uint          ; <uint> [#uses=1]
+  %C = setgt uint %Y, 17               ; <bool> [#uses=1]
+  ret bool %C
+}
+
+bool %gt_unsigned_to_small_signed(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setgt int %Y, 17
+  ret bool %C
+}
+
+bool %gt_unsigned_to_small_negative(ubyte %SB) {
+  %Y = cast ubyte %SB to int
+  %C = setgt int %Y, -17
+  ret bool %C
+}