Author: tstellar
Date: Wed Apr 11 15:47:00 2018
New Revision: 329857
URL: http://llvm.org/viewvc/llvm-project?rev=329857&view=rev
Log:
Add missing test file from r329855
Added:
llvm/branches/release_60/test/Transforms/IPConstantProp/musttail-call.ll
Added: llvm/branches/release_60/test/Transforms/IPConstantProp/musttail-call.ll
URL:
http://llvm.org/viewvc/llvm-project/llvm/branches/release_60/test/Transforms/IPConstantProp/musttail-call.ll?rev=329857&view=auto
==============================================================================
--- llvm/branches/release_60/test/Transforms/IPConstantProp/musttail-call.ll
(added)
+++ llvm/branches/release_60/test/Transforms/IPConstantProp/musttail-call.ll
Wed Apr 11 15:47:00 2018
@@ -0,0 +1,58 @@
+; RUN: opt < %s -ipsccp -S | FileCheck %s
+; PR36485
+; musttail call result can\'t be replaced with a constant, unless the call
+; can be removed
+
+declare i32 @external()
+
+define i8* @start(i8 %v) {
+ %c1 = icmp eq i8 %v, 0
+ br i1 %c1, label %true, label %false
+true:
+ ; CHECK: %ca = musttail call i8* @side_effects(i8 %v)
+ ; CHECK: ret i8* %ca
+ %ca = musttail call i8* @side_effects(i8 %v)
+ ret i8* %ca
+false:
+ %c2 = icmp eq i8 %v, 1
+ br i1 %c2, label %c2_true, label %c2_false
+c2_true:
+ ; CHECK: %ca1 = musttail call i8* @no_side_effects(i8 %v)
+ ; CHECK: ret i8* %ca1
+ %ca1 = musttail call i8* @no_side_effects(i8 %v)
+ ret i8* %ca1
+c2_false:
+ ; CHECK: %ca2 = musttail call i8* @dont_zap_me(i8 %v)
+ ; CHECK: ret i8* %ca2
+ %ca2 = musttail call i8* @dont_zap_me(i8 %v)
+ ret i8* %ca2
+}
+
+define internal i8* @side_effects(i8 %v) {
+ %i1 = call i32 @external()
+
+ ; since this goes back to `start` the SCPP should be see that the return
value
+ ; is always `null`.
+ ; The call can't be removed due to `external` call above, though.
+
+ ; CHECK: %ca = musttail call i8* @start(i8 %v)
+ %ca = musttail call i8* @start(i8 %v)
+
+ ; Thus the result must be returned anyway
+ ; CHECK: ret i8* %ca
+ ret i8* %ca
+}
+
+define internal i8* @no_side_effects(i8 %v) readonly nounwind {
+ ; CHECK: ret i8* null
+ ret i8* null
+}
+
+define internal i8* @dont_zap_me(i8 %v) {
+ %i1 = call i32 @external()
+
+ ; The call to this function cannot be removed due to side effects. Thus the
+ ; return value should stay as it is, and should not be zapped.
+ ; CHECK: ret i8* null
+ ret i8* null
+}
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