mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-24 06:30:19 +00:00
eee962e1ce
in addition to integer expressions. Rewrite GetOrEnforceKnownAlignment as a ComputeMaskedBits problem, moving all of its special alignment knowledge to ComputeMaskedBits as low-zero-bits knowledge. Also, teach ComputeMaskedBits a few basic things about Mul and PHI instructions. This improves ComputeMaskedBits-based simplifications in a few cases, but more noticeably it significantly improves instcombine's alignment detection for loads, stores, and memory intrinsics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49492 91177308-0d34-0410-b5e6-96231b3b80d8
31 lines
863 B
LLVM
31 lines
863 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {align 16} | count 1
|
|
|
|
; Instcombine should be able to prove vector alignment in the
|
|
; presence of a few mild address computation tricks.
|
|
|
|
define void @foo(i8* %b, i64 %n, i64 %u, i64 %y) nounwind {
|
|
entry:
|
|
%c = ptrtoint i8* %b to i64
|
|
%d = and i64 %c, -16
|
|
%e = inttoptr i64 %d to double*
|
|
%v = mul i64 %u, 2
|
|
%z = and i64 %y, -2
|
|
%t1421 = icmp eq i64 %n, 0
|
|
br i1 %t1421, label %return, label %bb
|
|
|
|
bb:
|
|
%i = phi i64 [ %indvar.next, %bb ], [ 20, %entry ]
|
|
%j = mul i64 %i, %v
|
|
%h = add i64 %j, %z
|
|
%t8 = getelementptr double* %e, i64 %h
|
|
%p = bitcast double* %t8 to <2 x double>*
|
|
store <2 x double><double 0.0, double 0.0>, <2 x double>* %p, align 8
|
|
%indvar.next = add i64 %i, 1
|
|
%exitcond = icmp eq i64 %indvar.next, %n
|
|
br i1 %exitcond, label %return, label %bb
|
|
|
|
return:
|
|
ret void
|
|
}
|
|
|