Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/IPConstantProp/musttail-call.ll

@@ -1,58 +0,0 @@
-; 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
-}