RPCSX/llvm
1
0
Fork 0
mirror of https://github.com/RPCSX/llvm.git synced 2025-02-15 02:29:07 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[X86] Add test cases showing missed opportunities to use rotate right by 1 instructions when operation reads/writes memory.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2017-02-20 00:37:20 +00:00
parent 7c861d9e37
commit db343e334d
1 changed files with 83 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
test/CodeGen/X86/rotate.ll
View File

@ -541,3 +541,86 @@ define i8 @rotr1_8(i8 %A) nounwind {
%D = or i8 %B, %C
ret i8 %D
}
define void @rotr1_64_mem(i64* %Aptr) nounwind {
; 32-LABEL: rotr1_64_mem:
; 32: # BB#0:
; 32-NEXT: pushl %esi
; 32-NEXT: movl 8(%esp), %eax
; 32-NEXT: movl (%eax), %ecx
; 32-NEXT: movl 4(%eax), %edx
; 32-NEXT: movl %edx, %esi
; 32-NEXT: shldl $31, %ecx, %esi
; 32-NEXT: shldl $31, %edx, %ecx
; 32-NEXT: movl %ecx, 4(%eax)
; 32-NEXT: movl %esi, (%eax)
; 32-NEXT: popl %esi
; 64-LABEL: rotr1_64_mem:
; 64: # BB#0:
; 64-NEXT: rolq $63, (%rdi)
; 64-NEXT: retq
%A = load i64, i64 *%Aptr
%B = shl i64 %A, 63
%C = lshr i64 %A, 1
%D = or i64 %B, %C
store i64 %D, i64* %Aptr
ret void
}
define void @rotr1_32_mem(i32* %Aptr) nounwind {
; 32-LABEL: rotr1_32_mem:
; 32: # BB#0:
; 32-NEXT: movl 4(%esp), %eax
; 32-NEXT: roll $31, (%eax)
; 32-NEXT: retl
;
; 64-LABEL: rotr1_32_mem:
; 64: # BB#0:
; 64-NEXT: roll $31, (%rdi)
; 64-NEXT: retq
%A = load i32, i32 *%Aptr
%B = shl i32 %A, 31
%C = lshr i32 %A, 1
%D = or i32 %B, %C
store i32 %D, i32* %Aptr
ret void
}
define void @rotr1_16_mem(i16* %Aptr) nounwind {
; 32-LABEL: rotr1_16_mem:
; 32: # BB#0:
; 32-NEXT: movl 4(%esp), %eax
; 32-NEXT: rolw $15, (%eax)
; 32-NEXT: retl
;
; 64-LABEL: rotr1_16_mem:
; 64: # BB#0:
; 64-NEXT: rolw $15, (%rdi)
; 64-NEXT: retq
%A = load i16, i16 *%Aptr
%B = shl i16 %A, 15
%C = lshr i16 %A, 1
%D = or i16 %B, %C
store i16 %D, i16* %Aptr
ret void
}
define void @rotr1_8_mem(i8* %Aptr) nounwind {
; 32-LABEL: rotr1_8_mem:
; 32: # BB#0:
; 32-NEXT: movl 4(%esp), %eax
; 32-NEXT: rolb $7, (%eax)
; 32-NEXT: retl
;
; 64-LABEL: rotr1_8_mem:
; 64: # BB#0:
; 64-NEXT: rolb $7, (%rdi)
; 64-NEXT: retq
%A = load i8, i8 *%Aptr
%B = shl i8 %A, 7
%C = lshr i8 %A, 1
%D = or i8 %B, %C
store i8 %D, i8* %Aptr
ret void
}