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view test/CodeGen/X86/x86-64-double-shifts-var.ll @ 100:7d135dc70f03 LLVM 3.9

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LLVM 3.9
author Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
date Tue, 26 Jan 2016 22:53:40 +0900
parents e4204d083e25
children 1172e4bd9c6f
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; RUN: llc < %s -march=x86-64 -mcpu=athlon | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon-tbird | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon-4 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon-xp | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon-mp | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=k8 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=opteron | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon64 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon-fx | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=k8-sse3 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=opteron-sse3 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=athlon64-sse3 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=amdfam10 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=btver1 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=btver2 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=bdver1 | FileCheck %s
; RUN: llc < %s -march=x86-64 -mcpu=bdver2 | FileCheck %s

; Verify that for the X86_64 processors that are known to have poor latency 
; double precision shift instructions we do not generate 'shld' or 'shrd'
; instructions.

;uint64_t lshift(uint64_t a, uint64_t b, int c)
;{
;    return (a << c) | (b >> (64-c));
;}

define i64 @lshift(i64 %a, i64 %b, i32 %c) nounwind readnone {
entry:
; CHECK-NOT: shld 
  %sh_prom = zext i32 %c to i64
  %shl = shl i64 %a, %sh_prom
  %sub = sub nsw i32 64, %c
  %sh_prom1 = zext i32 %sub to i64
  %shr = lshr i64 %b, %sh_prom1
  %or = or i64 %shr, %shl
  ret i64 %or
}

;uint64_t rshift(uint64_t a, uint64_t b, int c)
;{
;    return (a >> c) | (b << (64-c));
;}

define i64 @rshift(i64 %a, i64 %b, i32 %c) nounwind readnone {
entry:
; CHECK-NOT: shrd
  %sh_prom = zext i32 %c to i64
  %shr = lshr i64 %a, %sh_prom
  %sub = sub nsw i32 64, %c
  %sh_prom1 = zext i32 %sub to i64
  %shl = shl i64 %b, %sh_prom1
  %or = or i64 %shl, %shr
  ret i64 %or
}