[PATCH] D89390: [TargetLowering] Update optimization to check for boolean content

[Erik Hogeman via Phabricator via llvm-commits]

ErikHogeman updated this revision to Diff 299413.
ErikHogeman added a comment.

Adds the test without the patch, to make it explicit what code was generated before.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D89390/new/

https://reviews.llvm.org/D89390

Files:
  llvm/test/CodeGen/NVPTX/pow2_mask_cmp.ll


Index: llvm/test/CodeGen/NVPTX/pow2_mask_cmp.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/NVPTX/pow2_mask_cmp.ll
@@ -0,0 +1,13 @@
+; RUN: llc -march=nvptx -verify-machineinstrs < %s | FileCheck %s
+
+; Tests the following pattern:
+; (X & 8) != 0 --> (X & 8) >> 3
+
+; CHECK-LABEL: @pow2_mask_cmp
+; CHECK: bfe.u32 {{%r[0-9]+}}, {{%r[0-9]+}}, 3, 1
+define i32 @pow2_mask_cmp(i32 %x) {
+  %a = and i32 %x, 8
+  %cmp = icmp ne i32 %a, 0
+  %r = zext i1 %cmp to i32
+  ret i32 %r
+}


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