[llvm] r318764 - [InstCombine] Test for PR35354: unable to vectorize loop with std::max

[Alexey Bataev via llvm-commits]

Author: abataev
Date: Tue Nov 21 06:49:13 2017
New Revision: 318764

URL: http://llvm.org/viewvc/llvm-project?rev=318764&view=rev
Log:
[InstCombine] Test for PR35354: unable to vectorize loop with std::max
on floats, NFC.

Added:
    llvm/trunk/test/Transforms/InstCombine/load-bitcast-select.ll

Added: llvm/trunk/test/Transforms/InstCombine/load-bitcast-select.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/load-bitcast-select.ll?rev=318764&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/load-bitcast-select.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/load-bitcast-select.ll Tue Nov 21 06:49:13 2017
@@ -0,0 +1,57 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S -data-layout="e-m:e-i64:64-f80:128-n8:16:32:64-S128" | FileCheck %s
+
+ at a = global [1000 x float] zeroinitializer, align 16
+ at b = global [1000 x float] zeroinitializer, align 16
+
+define void @_Z3foov() {
+; CHECK-LABEL: @_Z3foov(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_COND:%.*]]
+; CHECK:       for.cond:
+; CHECK-NEXT:    [[I_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[I_0]], 1000
+; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP:%.*]]
+; CHECK:       for.cond.cleanup:
+; CHECK-NEXT:    ret void
+; CHECK:       for.body:
+; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[I_0]] to i64
+; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [1000 x float], [1000 x float]* @a, i64 0, i64 [[TMP0]]
+; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds [1000 x float], [1000 x float]* @b, i64 0, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP1:%.*]] = load float, float* [[ARRAYIDX]], align 4
+; CHECK-NEXT:    [[TMP2:%.*]] = load float, float* [[ARRAYIDX2]], align 4
+; CHECK-NEXT:    [[CMP_I:%.*]] = fcmp fast olt float [[TMP1]], [[TMP2]]
+; CHECK-NEXT:    [[__B___A_I:%.*]] = select i1 [[CMP_I]], float* [[ARRAYIDX2]], float* [[ARRAYIDX]]
+; CHECK-NEXT:    [[TMP3:%.*]] = bitcast float* [[__B___A_I]] to i32*
+; CHECK-NEXT:    [[TMP4:%.*]] = load i32, i32* [[TMP3]], align 4
+; CHECK-NEXT:    [[TMP5:%.*]] = bitcast float* [[ARRAYIDX]] to i32*
+; CHECK-NEXT:    store i32 [[TMP4]], i32* [[TMP5]], align 4
+; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[I_0]], 1
+; CHECK-NEXT:    br label [[FOR_COND]]
+;
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.body, %entry
+  %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
+  %cmp = icmp ult i32 %i.0, 1000
+  br i1 %cmp, label %for.body, label %for.cond.cleanup
+
+for.cond.cleanup:                                 ; preds = %for.cond
+  ret void
+
+for.body:                                         ; preds = %for.cond
+  %0 = zext i32 %i.0 to i64
+  %arrayidx = getelementptr inbounds [1000 x float], [1000 x float]* @a, i64 0, i64 %0
+  %arrayidx2 = getelementptr inbounds [1000 x float], [1000 x float]* @b, i64 0, i64 %0
+  %1 = load float, float* %arrayidx, align 4
+  %2 = load float, float* %arrayidx2, align 4
+  %cmp.i = fcmp fast olt float %1, %2
+  %__b.__a.i = select i1 %cmp.i, float* %arrayidx2, float* %arrayidx
+  %3 = bitcast float* %__b.__a.i to i32*
+  %4 = load i32, i32* %3, align 4
+  %5 = bitcast float* %arrayidx to i32*
+  store i32 %4, i32* %5, align 4
+  %inc = add nuw nsw i32 %i.0, 1
+  br label %for.cond
+}