https://bugs.llvm.org/show_bug.cgi?id=43047
Bug ID: 43047
Summary: can't possibly be optimal ppc code for bswap.i128
Product: new-bugs
Version: unspecified
Hardware: Macintosh
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: sland...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
This is what I'm getting for this zig:
export fn f(a: u128) u128 {
return @byteSwap(u128, a);
}
which is this llvm-ir:
; ModuleID = 'f'
source_filename = "f"
target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-unknown-linux-gnu"
; Function Attrs: nobuiltin nounwind readnone
define i128 @f(i128) local_unnamed_addr #0 !dbg !4 {
Entry:
call void @llvm.dbg.value(metadata i128 %0, metadata !10, metadata
!DIExpression()), !dbg !11
%1 = tail call i128 @llvm.bswap.i128(i128 %0), !dbg !12
ret i128 %1, !dbg !14
}
; Function Attrs: nounwind readnone speculatable
declare i128 @llvm.bswap.i128(i128) #1
f:
.Lfunc_begin0:
.file 1 "/tmp/f.zig"
.loc 1 0 0
.cfi_sections .debug_frame
.cfi_startproc
.loc 1 2 8 prologue_end
rotldi 6, 4, 16
rotldi 5, 4, 8
rotldi 7, 4, 24
rotldi 8, 3, 16
rldimi 5, 6, 8, 48
rotldi 6, 3, 8
rldimi 6, 8, 8, 48
rotldi 8, 4, 32
rldimi 5, 7, 16, 40
rotldi 7, 3, 24
rldimi 6, 7, 16, 40
rotldi 7, 4, 48
rldimi 5, 8, 24, 32
rotldi 8, 3, 32
rldimi 6, 8, 24, 32
rldimi 5, 7, 40, 16
rotldi 7, 3, 48
rotldi 8, 4, 56
rldimi 6, 7, 40, 16
rotldi 7, 3, 56
rldimi 5, 8, 48, 8
rldimi 6, 7, 48, 8
rldimi 5, 4, 56, 0
rldimi 6, 3, 56, 0
.loc 1 2 1 is_stmt 0
mr 3, 5
mr 4, 6
blr
.Ltmp0:
.long 0
.quad 0
.Lfunc_end0:
.size f, .Lfunc_end0-.Lfunc_begin0
.cfi_endproc
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