llvm-6502/test/CodeGen/X86/2011-12-8-bitcastintprom.ll

; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 | FileCheck %s

; Make sure that the conversion between v4i8 to v2i16 is not a simple bitcast.
; CHECK: prom_bug
; CHECK: shufb
; CHECK: movd
; CHECK: movw
; CHECK: ret
define void @prom_bug(<4 x i8> %t, i16* %p) {
  %r = bitcast <4 x i8> %t to <2 x i16>
  %o = extractelement <2 x i16> %r, i32 0
  store i16 %o, i16* %p
  ret void
}
Fix a bug in the integer-promotion of bitcast operations on vector types. We must not issue a bitcast operation for integer-promotion of vector types, because the location of the values in the vector may be different. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146150 91177308-0d34-0410-b5e6-96231b3b80d8 2011-12-08 13:10:01 +00:00			`; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 \| FileCheck %s`

			`; Make sure that the conversion between v4i8 to v2i16 is not a simple bitcast.`
			`; CHECK: prom_bug`
			`; CHECK: shufb`
The type-legalizer often scalarizes code. One of the common patterns is extract-and-truncate. In this patch we optimize this pattern and convert the sequence into extract op of a narrow type. This allows the BUILD_VECTOR dag optimizations to construct efficient shuffle operations in many cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149692 91177308-0d34-0410-b5e6-96231b3b80d8 2012-02-03 13:18:25 +00:00			`; CHECK: movd`
Fix a bug in the integer-promotion of bitcast operations on vector types. We must not issue a bitcast operation for integer-promotion of vector types, because the location of the values in the vector may be different. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146150 91177308-0d34-0410-b5e6-96231b3b80d8 2011-12-08 13:10:01 +00:00			`; CHECK: movw`
			`; CHECK: ret`
			`define void @prom_bug(<4 x i8> %t, i16* %p) {`
			`%r = bitcast <4 x i8> %t to <2 x i16>`
			`%o = extractelement <2 x i16> %r, i32 0`
			`store i16 %o, i16* %p`
			`ret void`
			`}`