RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 19:52:54 +01:00
Code Issues Projects Releases Wiki Activity

[X86] Add integer division test for PR23590

Browse Source 
Shows missed opportunity to recognise reduced integer division result size

llvm-svn: 287110
This commit is contained in:
Simon Pilgrim 2016-11-16 14:54:34 +00:00
parent eeb3114678
commit eedb418f25
1 changed files with 41 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
test/CodeGen/X86/divide-by-constant.ll
View File

@ -295,3 +295,44 @@ entry:
%div = udiv i32 %x, 33
ret i32 %div
}
define i64 @PR23590(i64 %x) nounwind {
; X32-LABEL: PR23590:
; X32: # BB#0: # %entry
; X32-NEXT: subl $12, %esp
; X32-NEXT: pushl $0
; X32-NEXT: pushl $12345 # imm = 0x3039
; X32-NEXT: pushl {{[0-9]+}}(%esp)
; X32-NEXT: pushl {{[0-9]+}}(%esp)
; X32-NEXT: calll __umoddi3
; X32-NEXT: addl $16, %esp
; X32-NEXT: pushl $0
; X32-NEXT: pushl $7
; X32-NEXT: pushl %edx
; X32-NEXT: pushl %eax
; X32-NEXT: calll __udivdi3
; X32-NEXT: addl $28, %esp
; X32-NEXT: retl
;
; X64-LABEL: PR23590:
; X64: # BB#0: # %entry
; X64-NEXT: movq %rdi, %rcx
; X64-NEXT: movabsq $6120523590596543007, %rdx # imm = 0x54F077C718E7C21F
; X64-NEXT: movq %rcx, %rax
; X64-NEXT: mulq %rdx
; X64-NEXT: shrq $12, %rdx
; X64-NEXT: imulq $12345, %rdx, %rax # imm = 0x3039
; X64-NEXT: subq %rax, %rcx
; X64-NEXT: movabsq $2635249153387078803, %rdx # imm = 0x2492492492492493
; X64-NEXT: movq %rcx, %rax
; X64-NEXT: mulq %rdx
; X64-NEXT: subq %rdx, %rcx
; X64-NEXT: shrq %rcx
; X64-NEXT: leaq (%rcx,%rdx), %rax
; X64-NEXT: shrq $2, %rax
; X64-NEXT: retq
entry:
%rem = urem i64 %x, 12345
%div = udiv i64 %rem, 7
ret i64 %div
}