[PATCH] D79267: [RISCV][NFC] Add Test for (select (or B1, B2), X, Y)

[Sam Elliott via Phabricator via llvm-commits]

lenary updated this revision to Diff 261643.
lenary added a comment.

Update comment in test to more generally talk about what the test is looking
for, rather than the specific hook in the optimisation.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79267/new/

https://reviews.llvm.org/D79267

Files:
  llvm/test/CodeGen/RISCV/select-or.ll


Index: llvm/test/CodeGen/RISCV/select-or.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/RISCV/select-or.ll
@@ -0,0 +1,45 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
+; RUN:   | FileCheck -check-prefix=RV32I %s
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN:   | FileCheck -check-prefix=RV64I %s
+
+;; There are a few different ways to lower (select (or A, B), X, Y). This test
+;; ensures that we do so with as few branches as possible.
+
+define signext i32 @select_of_or(i32 signext %a, i32 signext %b, i32 signext %c, i32 signext %d) nounwind {
+; RV32I-LABEL: select_of_or:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    mv a4, a0
+; RV32I-NEXT:    bne a2, a3, .LBB0_3
+; RV32I-NEXT:  # %bb.1:
+; RV32I-NEXT:    bne a0, a1, .LBB0_4
+; RV32I-NEXT:  .LBB0_2:
+; RV32I-NEXT:    ret
+; RV32I-NEXT:  .LBB0_3:
+; RV32I-NEXT:    mv a4, a1
+; RV32I-NEXT:    beq a0, a1, .LBB0_2
+; RV32I-NEXT:  .LBB0_4:
+; RV32I-NEXT:    mv a0, a4
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: select_of_or:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    mv a4, a0
+; RV64I-NEXT:    bne a2, a3, .LBB0_3
+; RV64I-NEXT:  # %bb.1:
+; RV64I-NEXT:    bne a0, a1, .LBB0_4
+; RV64I-NEXT:  .LBB0_2:
+; RV64I-NEXT:    ret
+; RV64I-NEXT:  .LBB0_3:
+; RV64I-NEXT:    mv a4, a1
+; RV64I-NEXT:    beq a0, a1, .LBB0_2
+; RV64I-NEXT:  .LBB0_4:
+; RV64I-NEXT:    mv a0, a4
+; RV64I-NEXT:    ret
+  %1 = icmp eq i32 %a, %b
+  %2 = icmp eq i32 %c, %d
+  %3 = or i1 %1, %2
+  %4 = select i1 %3, i32 %a, i32 %b
+  ret i32 %4
+}


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