From 58c9643afb4026c3d26e825bcd3b69e065e9f814 Mon Sep 17 00:00:00 2001
From: Philip Reames <listmail@philipreames.com>
Date: Wed, 12 Jun 2019 19:23:10 +0000
Subject: [PATCH] [Tests] Autogen RLEV test and add tests for a future
 enhancement

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363193 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../IndVarSimplify/exit_value_tests.ll        | 228 +++++++++++++-----
 1 file changed, 171 insertions(+), 57 deletions(-)

diff --git a/test/Transforms/IndVarSimplify/exit_value_tests.ll b/test/Transforms/IndVarSimplify/exit_value_tests.ll
index e491524fd62..04ee33d9603 100644
--- a/test/Transforms/IndVarSimplify/exit_value_tests.ll
+++ b/test/Transforms/IndVarSimplify/exit_value_tests.ll
@@ -1,115 +1,229 @@
-; Test that we can evaluate the exit values of various expression types.  Since
-; these loops all have predictable exit values we can replace the use outside
-; of the loop with a closed-form computation, making the loop dead.
-;
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -indvars -loop-deletion -simplifycfg -S | FileCheck %s
 
-; CHECK-NOT: br
+; Test that we can evaluate the exit values of various expression types.  Since
+; these loops all have predictable exit values we can replace the use outside
+; of the loop with a closed-form computation.
 
 define i32 @polynomial_constant() {
 ; <label>:0
-	br label %Loop
+; CHECK-LABEL: @polynomial_constant(
+; CHECK-NEXT:  Out:
+; CHECK-NEXT:    ret i32 500500
+;
+  br label %Loop
 
 Loop:		; preds = %Loop, %0
-	%A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ]		; <i32> [#uses=3]
-	%B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ]		; <i32> [#uses=1]
-	%A2 = add i32 %A1, 1		; <i32> [#uses=1]
-	%B2 = add i32 %B1, %A1		; <i32> [#uses=2]
-	%C = icmp eq i32 %A1, 1000		; <i1> [#uses=1]
-	br i1 %C, label %Out, label %Loop
+  %A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ]		; <i32> [#uses=3]
+  %B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ]		; <i32> [#uses=1]
+  %A2 = add i32 %A1, 1		; <i32> [#uses=1]
+  %B2 = add i32 %B1, %A1		; <i32> [#uses=2]
+  %C = icmp eq i32 %A1, 1000		; <i1> [#uses=1]
+  br i1 %C, label %Out, label %Loop
 
 Out:		; preds = %Loop
-	ret i32 %B2
+  ret i32 %B2
 }
 
 define i32 @NSquare(i32 %N) {
 ; <label>:0
-	br label %Loop
+; CHECK-LABEL: @NSquare(
+; CHECK-NEXT:  Out:
+; CHECK-NEXT:    [[Y:%.*]] = mul i32 [[N:%.*]], [[N]]
+; CHECK-NEXT:    ret i32 [[Y]]
+;
+  br label %Loop
 
 Loop:		; preds = %Loop, %0
-	%X = phi i32 [ 0, %0 ], [ %X2, %Loop ]		; <i32> [#uses=4]
-	%X2 = add i32 %X, 1		; <i32> [#uses=1]
-	%c = icmp eq i32 %X, %N		; <i1> [#uses=1]
-	br i1 %c, label %Out, label %Loop
+  %X = phi i32 [ 0, %0 ], [ %X2, %Loop ]		; <i32> [#uses=4]
+  %X2 = add i32 %X, 1		; <i32> [#uses=1]
+  %c = icmp eq i32 %X, %N		; <i1> [#uses=1]
+  br i1 %c, label %Out, label %Loop
 
 Out:		; preds = %Loop
-	%Y = mul i32 %X, %X		; <i32> [#uses=1]
-	ret i32 %Y
+  %Y = mul i32 %X, %X		; <i32> [#uses=1]
+  ret i32 %Y
 }
 
 define i32 @NSquareOver2(i32 %N) {
 ; <label>:0
-	br label %Loop
+; CHECK-LABEL: @NSquareOver2(
+; CHECK-NEXT:  Out:
+; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[N:%.*]] to i33
+; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[N]], -1
+; CHECK-NEXT:    [[TMP2:%.*]] = zext i32 [[TMP1]] to i33
+; CHECK-NEXT:    [[TMP3:%.*]] = mul i33 [[TMP0]], [[TMP2]]
+; CHECK-NEXT:    [[TMP4:%.*]] = lshr i33 [[TMP3]], 1
+; CHECK-NEXT:    [[TMP5:%.*]] = trunc i33 [[TMP4]] to i32
+; CHECK-NEXT:    [[TMP6:%.*]] = add i32 [[N]], [[TMP5]]
+; CHECK-NEXT:    [[TMP7:%.*]] = add i32 [[TMP6]], 15
+; CHECK-NEXT:    ret i32 [[TMP7]]
+;
+  br label %Loop
 
 Loop:		; preds = %Loop, %0
-	%X = phi i32 [ 0, %0 ], [ %X2, %Loop ]		; <i32> [#uses=3]
-	%Y = phi i32 [ 15, %0 ], [ %Y2, %Loop ]		; <i32> [#uses=1]
-	%Y2 = add i32 %Y, %X		; <i32> [#uses=2]
-	%X2 = add i32 %X, 1		; <i32> [#uses=1]
-	%c = icmp eq i32 %X, %N		; <i1> [#uses=1]
-	br i1 %c, label %Out, label %Loop
+  %X = phi i32 [ 0, %0 ], [ %X2, %Loop ]		; <i32> [#uses=3]
+  %Y = phi i32 [ 15, %0 ], [ %Y2, %Loop ]		; <i32> [#uses=1]
+  %Y2 = add i32 %Y, %X		; <i32> [#uses=2]
+  %X2 = add i32 %X, 1		; <i32> [#uses=1]
+  %c = icmp eq i32 %X, %N		; <i1> [#uses=1]
+  br i1 %c, label %Out, label %Loop
 
 Out:		; preds = %Loop
-	ret i32 %Y2
+  ret i32 %Y2
 }
 
 define i32 @strength_reduced() {
 ; <label>:0
-	br label %Loop
+; CHECK-LABEL: @strength_reduced(
+; CHECK-NEXT:  Out:
+; CHECK-NEXT:    ret i32 500500
+;
+  br label %Loop
 
 Loop:		; preds = %Loop, %0
-	%A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ]		; <i32> [#uses=3]
-	%B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ]		; <i32> [#uses=1]
-	%A2 = add i32 %A1, 1		; <i32> [#uses=1]
-	%B2 = add i32 %B1, %A1		; <i32> [#uses=2]
-	%C = icmp eq i32 %A1, 1000		; <i1> [#uses=1]
-	br i1 %C, label %Out, label %Loop
+  %A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ]		; <i32> [#uses=3]
+  %B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ]		; <i32> [#uses=1]
+  %A2 = add i32 %A1, 1		; <i32> [#uses=1]
+  %B2 = add i32 %B1, %A1		; <i32> [#uses=2]
+  %C = icmp eq i32 %A1, 1000		; <i1> [#uses=1]
+  br i1 %C, label %Out, label %Loop
 
 Out:		; preds = %Loop
-	ret i32 %B2
+  ret i32 %B2
 }
 
 define i32 @chrec_equals() {
+; CHECK-LABEL: @chrec_equals(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    ret i32 101
+;
 entry:
-	br label %no_exit
+  br label %no_exit
 
 no_exit:		; preds = %no_exit, %entry
-	%i0 = phi i32 [ 0, %entry ], [ %i1, %no_exit ]		; <i32> [#uses=3]
-	%ISq = mul i32 %i0, %i0		; <i32> [#uses=1]
-	%i1 = add i32 %i0, 1		; <i32> [#uses=2]
-	%tmp.1 = icmp ne i32 %ISq, 10000		; <i1> [#uses=1]
-	br i1 %tmp.1, label %no_exit, label %loopexit
+  %i0 = phi i32 [ 0, %entry ], [ %i1, %no_exit ]		; <i32> [#uses=3]
+  %ISq = mul i32 %i0, %i0		; <i32> [#uses=1]
+  %i1 = add i32 %i0, 1		; <i32> [#uses=2]
+  %tmp.1 = icmp ne i32 %ISq, 10000		; <i1> [#uses=1]
+  br i1 %tmp.1, label %no_exit, label %loopexit
 
 loopexit:		; preds = %no_exit
-	ret i32 %i1
+  ret i32 %i1
 }
 
 define i16 @cast_chrec_test() {
 ; <label>:0
-	br label %Loop
+; CHECK-LABEL: @cast_chrec_test(
+; CHECK-NEXT:  Out:
+; CHECK-NEXT:    ret i16 1000
+;
+  br label %Loop
 
 Loop:		; preds = %Loop, %0
-	%A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ]		; <i32> [#uses=2]
-	%B1 = trunc i32 %A1 to i16		; <i16> [#uses=2]
-	%A2 = add i32 %A1, 1		; <i32> [#uses=1]
-	%C = icmp eq i16 %B1, 1000		; <i1> [#uses=1]
-	br i1 %C, label %Out, label %Loop
+  %A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ]		; <i32> [#uses=2]
+  %B1 = trunc i32 %A1 to i16		; <i16> [#uses=2]
+  %A2 = add i32 %A1, 1		; <i32> [#uses=1]
+  %C = icmp eq i16 %B1, 1000		; <i1> [#uses=1]
+  br i1 %C, label %Out, label %Loop
 
 Out:		; preds = %Loop
-	ret i16 %B1
+  ret i16 %B1
 }
 
 define i32 @linear_div_fold() {
+; CHECK-LABEL: @linear_div_fold(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    ret i32 34
+;
 entry:
-	br label %loop
+  br label %loop
 
 loop:		; preds = %loop, %entry
-	%i = phi i32 [ 4, %entry ], [ %i.next, %loop ]		; <i32> [#uses=3]
-	%i.next = add i32 %i, 8		; <i32> [#uses=1]
-	%RV = udiv i32 %i, 2		; <i32> [#uses=1]
-	%c = icmp ne i32 %i, 68		; <i1> [#uses=1]
-	br i1 %c, label %loop, label %loopexit
+  %i = phi i32 [ 4, %entry ], [ %i.next, %loop ]		; <i32> [#uses=3]
+  %i.next = add i32 %i, 8		; <i32> [#uses=1]
+  %RV = udiv i32 %i, 2		; <i32> [#uses=1]
+  %c = icmp ne i32 %i, 68		; <i1> [#uses=1]
+  br i1 %c, label %loop, label %loopexit
 
 loopexit:		; preds = %loop
-	ret i32 %RV
+  ret i32 %RV
 }
+
+define i32 @unroll_phi_select_constant_nonzero(i32 %arg1, i32 %arg2) {
+; CHECK-LABEL: @unroll_phi_select_constant_nonzero(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[SELECTOR:%.*]] = phi i32 [ [[ARG1:%.*]], [[ENTRY]] ], [ [[ARG2:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[I_NEXT]] = add nuw nsw i32 [[I]], 1
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i32 [[I]], 4
+; CHECK-NEXT:    br i1 [[C]], label [[LOOP]], label [[LOOPEXIT:%.*]]
+; CHECK:       loopexit:
+; CHECK-NEXT:    [[SELECTOR_LCSSA:%.*]] = phi i32 [ [[SELECTOR]], [[LOOP]] ]
+; CHECK-NEXT:    ret i32 [[SELECTOR_LCSSA]]
+;
+entry:
+  br label %loop
+
+loop:
+  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
+  %selector = phi i32 [%arg1, %entry], [%arg2, %loop]
+  %i.next = add nsw nuw i32 %i, 1
+  %c = icmp ult i32 %i, 4
+  br i1 %c, label %loop, label %loopexit
+
+loopexit:
+  ret i32 %selector
+}
+
+define i32 @unroll_phi_select_constant_zero(i32 %arg1, i32 %arg2) {
+; CHECK-LABEL: @unroll_phi_select_constant_zero(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    ret i32 [[ARG1:%.*]]
+;
+entry:
+  br label %loop
+
+loop:
+  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
+  %selector = phi i32 [%arg1, %entry], [%arg2, %loop]
+  %i.next = add i32 %i, 1
+  %c = icmp ne i32 %i, 0
+  br i1 %c, label %loop, label %loopexit
+
+loopexit:
+  ret i32 %selector
+}
+
+define i32 @unroll_phi_select(i32 %arg1, i32 %arg2, i16 %len) {
+; CHECK-LABEL: @unroll_phi_select(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[LENGTH:%.*]] = zext i16 [[LEN:%.*]] to i32
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[I:%.*]] = phi i32 [ -1, [[ENTRY:%.*]] ], [ [[I_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[SELECTOR:%.*]] = phi i32 [ [[ARG1:%.*]], [[ENTRY]] ], [ [[ARG2:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[I_NEXT]] = add nsw i32 [[I]], 1
+; CHECK-NEXT:    [[C:%.*]] = icmp slt i32 [[I]], [[LENGTH]]
+; CHECK-NEXT:    br i1 [[C]], label [[LOOP]], label [[LOOPEXIT:%.*]]
+; CHECK:       loopexit:
+; CHECK-NEXT:    [[SELECTOR_LCSSA:%.*]] = phi i32 [ [[SELECTOR]], [[LOOP]] ]
+; CHECK-NEXT:    ret i32 [[SELECTOR_LCSSA]]
+;
+entry:
+  %length = zext i16 %len to i32
+  br label %loop
+
+loop:
+  %i = phi i32 [ -1, %entry ], [ %i.next, %loop ]
+  %selector = phi i32 [%arg1, %entry], [%arg2, %loop]
+  %i.next = add nsw i32 %i, 1
+  %c = icmp slt i32 %i, %length
+  br i1 %c, label %loop, label %loopexit
+
+loopexit:
+  ret i32 %selector
+}
+
-- 
2.40.0