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[ConstantFold] Add lit testcase for bitcast problem. NFC 

llvm-svn: 333767
This commit is contained in:
Karl-Johan Karlsson 2018-06-01 15:08:14 +00:00
parent fc9a700f94
commit b60b920a8c
1 changed files with 29 additions and 0 deletions
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29
llvm/test/Analysis/ConstantFolding/gep-zeroinit-vector.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -constprop -S -o - | FileCheck %s
; Testcase that point out faulty bitcast that cast between different sizes.
; See "bitcast ([1 x %rec8]* @a to <2 x i16*>)" in checks below
%rec8 = type { i16 }
@a = global [1 x %rec8] zeroinitializer
define <2 x i16*> @test_gep() {
; CHECK-LABEL: @test_gep(
; CHECK-NEXT: ret <2 x i16*> bitcast ([1 x %rec8]* @a to <2 x i16*>)
;
%A = getelementptr [1 x %rec8], [1 x %rec8]* @a, <2 x i16> zeroinitializer, <2 x i64> zeroinitializer
%B = bitcast <2 x %rec8*> %A to <2 x i16*>
ret <2 x i16*> %B
}
; Testcase that verify the cast-of-cast when the outer/second cast is to a
; vector type.
define <4 x i16> @test_mmx_const() {
; CHECK-LABEL: @test_mmx_const(
; CHECK-NEXT: ret <4 x i16> zeroinitializer
;
%A = bitcast <2 x i32> zeroinitializer to x86_mmx
%B = bitcast x86_mmx %A to <4 x i16>
ret <4 x i16> %B
}