[llvm] r286978 - [InstCombine] add tests for bitcasted selects; NFC
Sanjay Patel via llvm-commits
llvm-commits at lists.llvm.org
Tue Nov 15 08:01:16 PST 2016
Author: spatel
Date: Tue Nov 15 10:01:16 2016
New Revision: 286978
URL: http://llvm.org/viewvc/llvm-project?rev=286978&view=rev
Log:
[InstCombine] add tests for bitcasted selects; NFC
Modified:
llvm/trunk/test/Transforms/InstCombine/bitcast.ll
Modified: llvm/trunk/test/Transforms/InstCombine/bitcast.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/bitcast.ll?rev=286978&r1=286977&r2=286978&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/bitcast.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/bitcast.ll Tue Nov 15 10:01:16 2016
@@ -113,6 +113,90 @@ define <4 x i32> @bitcast_xor_bitcast(<4
ret <4 x i32> %bc2
}
+; FIXME: Change the type of the vector select to eliminate 2 bitcasts.
+; https://llvm.org/bugs/show_bug.cgi?id=6137#c6
+
+define <4 x float> @bitcast_vector_select(<4 x float> %x, <2 x i64> %y, <4 x i1> %cmp) {
+; CHECK-LABEL: @bitcast_vector_select(
+; CHECK-NEXT: [[T4:%.*]] = bitcast <4 x float> %x to <4 x i32>
+; CHECK-NEXT: [[T5:%.*]] = bitcast <2 x i64> %y to <4 x i32>
+; CHECK-NEXT: [[T6:%.*]] = select <4 x i1> %cmp, <4 x i32> [[T4]], <4 x i32> [[T5]]
+; CHECK-NEXT: [[T7:%.*]] = bitcast <4 x i32> [[T6]] to <4 x float>
+; CHECK-NEXT: ret <4 x float> [[T7]]
+;
+ %t4 = bitcast <4 x float> %x to <4 x i32>
+ %t5 = bitcast <2 x i64> %y to <4 x i32>
+ %t6 = select <4 x i1> %cmp, <4 x i32> %t4, <4 x i32> %t5
+ %t7 = bitcast <4 x i32> %t6 to <4 x float>
+ ret <4 x float> %t7
+}
+
+; FIXME: Change the type of the scalar select to eliminate a bitcast.
+
+define float @bitcast_scalar_select(float %x, <4 x i8> %y, i1 %cmp) {
+; CHECK-LABEL: @bitcast_scalar_select(
+; CHECK-NEXT: [[T4:%.*]] = bitcast float %x to <4 x i8>
+; CHECK-NEXT: [[T6:%.*]] = select i1 %cmp, <4 x i8> [[T4]], <4 x i8> %y
+; CHECK-NEXT: [[T7:%.*]] = bitcast <4 x i8> [[T6]] to float
+; CHECK-NEXT: ret float [[T7]]
+;
+ %t4 = bitcast float %x to <4 x i8>
+ %t6 = select i1 %cmp, <4 x i8> %t4, <4 x i8> %y
+ %t7 = bitcast <4 x i8> %t6 to float
+ ret float %t7
+}
+
+; FIXME: Change the type of the scalar select of vectors to eliminate 2 bitcasts.
+
+define <4 x float> @bitcast_scalar_select_of_vectors(<4 x float> %x, <2 x i64> %y, i1 %cmp) {
+; CHECK-LABEL: @bitcast_scalar_select_of_vectors(
+; CHECK-NEXT: [[T4:%.*]] = bitcast <4 x float> %x to <4 x i32>
+; CHECK-NEXT: [[T5:%.*]] = bitcast <2 x i64> %y to <4 x i32>
+; CHECK-NEXT: [[T6:%.*]] = select i1 %cmp, <4 x i32> [[T4]], <4 x i32> [[T5]]
+; CHECK-NEXT: [[T7:%.*]] = bitcast <4 x i32> [[T6]] to <4 x float>
+; CHECK-NEXT: ret <4 x float> [[T7]]
+;
+ %t4 = bitcast <4 x float> %x to <4 x i32>
+ %t5 = bitcast <2 x i64> %y to <4 x i32>
+ %t6 = select i1 %cmp, <4 x i32> %t4, <4 x i32> %t5
+ %t7 = bitcast <4 x i32> %t6 to <4 x float>
+ ret <4 x float> %t7
+}
+
+; Can't change the type of the vector select if the dest type is scalar.
+
+define float @bitcast_vector_select_no_fold1(float %x, <2 x i16> %y, <4 x i1> %cmp) {
+; CHECK-LABEL: @bitcast_vector_select_no_fold1(
+; CHECK-NEXT: [[T4:%.*]] = bitcast float %x to <4 x i8>
+; CHECK-NEXT: [[T5:%.*]] = bitcast <2 x i16> %y to <4 x i8>
+; CHECK-NEXT: [[T6:%.*]] = select <4 x i1> %cmp, <4 x i8> [[T4]], <4 x i8> [[T5]]
+; CHECK-NEXT: [[T7:%.*]] = bitcast <4 x i8> [[T6]] to float
+; CHECK-NEXT: ret float [[T7]]
+;
+ %t4 = bitcast float %x to <4 x i8>
+ %t5 = bitcast <2 x i16> %y to <4 x i8>
+ %t6 = select <4 x i1> %cmp, <4 x i8> %t4, <4 x i8> %t5
+ %t7 = bitcast <4 x i8> %t6 to float
+ ret float %t7
+}
+
+; Can't change the type of the vector select if the number of elements in the dest type is not the same.
+
+define <2 x float> @bitcast_vector_select_no_fold2(<2 x float> %x, <4 x i16> %y, <8 x i1> %cmp) {
+; CHECK-LABEL: @bitcast_vector_select_no_fold2(
+; CHECK-NEXT: [[T4:%.*]] = bitcast <2 x float> %x to <8 x i8>
+; CHECK-NEXT: [[T5:%.*]] = bitcast <4 x i16> %y to <8 x i8>
+; CHECK-NEXT: [[T6:%.*]] = select <8 x i1> %cmp, <8 x i8> [[T4]], <8 x i8> [[T5]]
+; CHECK-NEXT: [[T7:%.*]] = bitcast <8 x i8> [[T6]] to <2 x float>
+; CHECK-NEXT: ret <2 x float> [[T7]]
+;
+ %t4 = bitcast <2 x float> %x to <8 x i8>
+ %t5 = bitcast <4 x i16> %y to <8 x i8>
+ %t6 = select <8 x i1> %cmp, <8 x i8> %t4, <8 x i8> %t5
+ %t7 = bitcast <8 x i8> %t6 to <2 x float>
+ ret <2 x float> %t7
+}
+
; Optimize bitcasts that are extracting low element of vector. This happens because of SRoA.
; rdar://7892780
define float @test2(<2 x float> %A, <2 x i32> %B) {
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