llvm-6502/test/CodeGen/X86/subreg-to-reg-2.ll
Evan Cheng 7d6d4b360f Do not fold away subreg_to_reg if the source register has a sub-register index. That means the source register is taking a sub-register of a larger register. e.g. On x86
%RAX<def> = ...
%RAX<def> = SUBREG_TO_REG 0, %EAX:3<kill>, 3
The first def is defining RAX, not EAX so the top bits were not zero-extended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67511 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-23 07:19:58 +00:00

26 lines
1.1 KiB
LLVM

; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin | grep movl
; rdar://6707985
%XXOO = type { %"struct.XXC::XXCC", i8*, %"struct.XXC::XXOO::$_71" }
%XXValue = type opaque
%"struct.XXC::ArrayStorage" = type { i32, i32, i32, i8*, i8*, [1 x %XXValue*] }
%"struct.XXC::XXArray" = type { %XXOO, i32, %"struct.XXC::ArrayStorage"* }
%"struct.XXC::XXCC" = type { i32 (...)**, i8* }
%"struct.XXC::XXOO::$_71" = type { [2 x %XXValue*] }
define internal fastcc %XXValue* @t(i64* %out, %"struct.XXC::ArrayStorage"* %tmp9) nounwind {
prologue:
%array = load %XXValue** inttoptr (i64 11111111 to %XXValue**) ; <%XXValue*> [#uses=0]
%index = load %XXValue** inttoptr (i64 22222222 to %XXValue**) ; <%XXValue*> [#uses=1]
%tmp = ptrtoint %XXValue* %index to i64 ; <i64> [#uses=2]
store i64 %tmp, i64* %out
%tmp6 = trunc i64 %tmp to i32 ; <i32> [#uses=1]
br label %bb5
bb5: ; preds = %prologue
%tmp10 = zext i32 %tmp6 to i64 ; <i64> [#uses=1]
%tmp11 = getelementptr %"struct.XXC::ArrayStorage"* %tmp9, i64 0, i32 5, i64 %tmp10 ; <%XXValue**> [#uses=1]
%tmp12 = load %XXValue** %tmp11, align 8 ; <%XXValue*> [#uses=1]
ret %XXValue* %tmp12
}