[llvm] 1c21635 - [NFC][InstCombine] Tests for x s/EXACT (-1 << y) pattern

[Roman Lebedev via llvm-commits]

Author: Roman Lebedev
Date: 2020-08-06T23:37:15+03:00
New Revision: 1c21635c94df0e680cbb0797a64d09a63f619fc0

URL: https://github.com/llvm/llvm-project/commit/1c21635c94df0e680cbb0797a64d09a63f619fc0
DIFF: https://github.com/llvm/llvm-project/commit/1c21635c94df0e680cbb0797a64d09a63f619fc0.diff

LOG: [NFC][InstCombine] Tests for  x s/EXACT (-1 << y)  pattern

Added: 
    llvm/test/Transforms/InstCombine/sdiv-exact-by-negative-power-of-two.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstCombine/sdiv-exact-by-negative-power-of-two.ll b/llvm/test/Transforms/InstCombine/sdiv-exact-by-negative-power-of-two.ll
new file mode 100644
index 000000000000..39aa15cb3b54
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/sdiv-exact-by-negative-power-of-two.ll
@@ -0,0 +1,59 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt %s -instcombine -S | FileCheck %s
+
+; Fold
+;   x s/EXACT (-1 << y)
+; to
+;   -(x a>>EXACT y)
+
+define i8 @t0(i8 %x) {
+; CHECK-LABEL: @t0(
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i8 [[X:%.*]], -32
+; CHECK-NEXT:    ret i8 [[DIV]]
+;
+  %div = sdiv exact i8 %x, -32
+  ret i8 %div
+}
+define i8 @n1(i8 %x) {
+; CHECK-LABEL: @n1(
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i8 [[X:%.*]], -32
+; CHECK-NEXT:    ret i8 [[DIV]]
+;
+  %div = sdiv i8 %x, -32 ; not exact
+  ret i8 %div
+}
+
+define <2 x i8> @t2_vec_splat(<2 x i8> %x) {
+; CHECK-LABEL: @t2_vec_splat(
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact <2 x i8> [[X:%.*]], <i8 -32, i8 -32>
+; CHECK-NEXT:    ret <2 x i8> [[DIV]]
+;
+  %div = sdiv exact <2 x i8> %x, <i8 -32, i8 -32>
+  ret <2 x i8> %div
+}
+
+define <2 x i8> @t3_vec(<2 x i8> %x) {
+; CHECK-LABEL: @t3_vec(
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact <2 x i8> [[X:%.*]], <i8 -32, i8 -16>
+; CHECK-NEXT:    ret <2 x i8> [[DIV]]
+;
+  %div = sdiv exact <2 x i8> %x, <i8 -32, i8 -16>
+  ret <2 x i8> %div
+}
+
+define <2 x i8> @n4_vec_mixed(<2 x i8> %x) {
+; CHECK-LABEL: @n4_vec_mixed(
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact <2 x i8> [[X:%.*]], <i8 -32, i8 16>
+; CHECK-NEXT:    ret <2 x i8> [[DIV]]
+;
+  %div = sdiv exact <2 x i8> %x, <i8 -32, i8 16>
+  ret <2 x i8> %div
+}
+
+define <2 x i8> @n4_vec_undef(<2 x i8> %x) {
+; CHECK-LABEL: @n4_vec_undef(
+; CHECK-NEXT:    ret <2 x i8> undef
+;
+  %div = sdiv exact <2 x i8> %x, <i8 -32, i8 undef>
+  ret <2 x i8> %div
+}