maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[x86] add test case that shows holes in LEA isel 

llvm-svn: 250910
This commit is contained in:
Sanjay Patel 2015-10-21 17:24:00 +00:00
parent ff06370e12
commit 557001d1c7
1 changed files with 125 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
llvm/test/CodeGen/X86/or-lea.ll Normal file
View File

@ -0,0 +1,125 @@
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
; InstCombine and DAGCombiner transform an 'add' into an 'or'
; if there are no common bits from the incoming operands.
; LEA instruction selection should be able to see through that
; transform and reduce add/shift/or instruction counts.
define i32 @or_shift1_and1(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift1_and1:
; CHECK: # BB#0:
; CHECK-NEXT: addl %edi, %edi
; CHECK-NEXT: andl $1, %esi
; CHECK-NEXT: leal (%rsi,%rdi), %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 1
%and = and i32 %y, 1
%or = or i32 %and, %shl
ret i32 %or
}
define i32 @or_shift1_and1_swapped(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift1_and1_swapped:
; CHECK: # BB#0:
; CHECK-NEXT: leal (%rdi,%rdi), %eax
; CHECK-NEXT: andl $1, %esi
; CHECK-NEXT: orl %esi, %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 1
%and = and i32 %y, 1
%or = or i32 %shl, %and
ret i32 %or
}
define i32 @or_shift2_and1(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift2_and1:
; CHECK: # BB#0:
; CHECK-NEXT: leal (,%rdi,4), %eax
; CHECK-NEXT: andl $1, %esi
; CHECK-NEXT: orl %esi, %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 2
%and = and i32 %y, 1
%or = or i32 %shl, %and
ret i32 %or
}
define i32 @or_shift3_and1(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift3_and1:
; CHECK: # BB#0:
; CHECK-NEXT: leal (,%rdi,8), %eax
; CHECK-NEXT: andl $1, %esi
; CHECK-NEXT: orl %esi, %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 3
%and = and i32 %y, 1
%or = or i32 %shl, %and
ret i32 %or
}
define i32 @or_shift3_and7(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift3_and7:
; CHECK: # BB#0:
; CHECK-NEXT: leal (,%rdi,8), %eax
; CHECK-NEXT: andl $7, %esi
; CHECK-NEXT: orl %esi, %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 3
%and = and i32 %y, 7
%or = or i32 %shl, %and
ret i32 %or
}
; The shift is too big for an LEA.
define i32 @or_shift4_and1(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift4_and1:
; CHECK: # BB#0:
; CHECK-NEXT: shll $4, %edi
; CHECK-NEXT: andl $1, %esi
; CHECK-NEXT: leal (%rsi,%rdi), %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 4
%and = and i32 %y, 1
%or = or i32 %shl, %and
ret i32 %or
}
; The mask is too big for the shift, so the 'or' isn't equivalent to an 'add'.
define i32 @or_shift3_and8(i32 %x, i32 %y) {
; CHECK-LABEL: or_shift3_and8:
; CHECK: # BB#0:
; CHECK-NEXT: leal (,%rdi,8), %eax
; CHECK-NEXT: andl $8, %esi
; CHECK-NEXT: orl %esi, %eax
; CHECK-NEXT: retq
%shl = shl i32 %x, 3
%and = and i32 %y, 8
%or = or i32 %shl, %and
ret i32 %or
}
; 64-bit operands should work too.
define i64 @or_shift1_and1_64(i64 %x, i64 %y) {
; CHECK-LABEL: or_shift1_and1_64:
; CHECK: # BB#0:
; CHECK-NEXT: addq %rdi, %rdi
; CHECK-NEXT: andl $1, %esi
; CHECK-NEXT: leaq (%rsi,%rdi), %rax
; CHECK-NEXT: retq
%shl = shl i64 %x, 1
%and = and i64 %y, 1
%or = or i64 %and, %shl
ret i64 %or
}