mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
186d8a3d67
When considering folding a bitcast of an alloca into the alloca itself, make sure we don't shrink the amount of memory being allocated, or things rapidly go sideways. rdar://13324424 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176547 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
2.3 KiB
LLVM
46 lines
2.3 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-apple-macosx10.9.0"
|
|
|
|
%struct._my_struct = type <{ [12 x i8], [4 x i8] }>
|
|
|
|
@initval = common global %struct._my_struct zeroinitializer, align 1
|
|
|
|
; InstCombine will try to change the %struct._my_struct alloca into an
|
|
; allocation of an i96 because of the bitcast to create %2. That's not valid,
|
|
; as the other 32 bits of the structure still feed into the return value
|
|
define { i64, i64 } @function(i32 %x, i32 %y, i32 %z) nounwind {
|
|
; CHECK: @function
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: %retval = alloca %struct._my_struct, align 8
|
|
; CHECK-NOT: bitcast i96* %retval to %struct._my_struct*
|
|
entry:
|
|
%retval = alloca %struct._my_struct, align 8
|
|
%k.sroa.0.0.copyload = load i96* bitcast (%struct._my_struct* @initval to i96*), align 1
|
|
%k.sroa.1.12.copyload = load i32* bitcast ([4 x i8]* getelementptr inbounds (%struct._my_struct* @initval, i64 0, i32 1) to i32*), align 1
|
|
%0 = zext i32 %x to i96
|
|
%bf.value = shl nuw nsw i96 %0, 6
|
|
%bf.clear = and i96 %k.sroa.0.0.copyload, -288230376151711744
|
|
%1 = zext i32 %y to i96
|
|
%bf.value2 = shl nuw nsw i96 %1, 32
|
|
%bf.shl3 = and i96 %bf.value2, 288230371856744448
|
|
%bf.value.masked = and i96 %bf.value, 4294967232
|
|
%2 = zext i32 %z to i96
|
|
%bf.value8 = and i96 %2, 63
|
|
%bf.clear4 = or i96 %bf.shl3, %bf.value.masked
|
|
%bf.set5 = or i96 %bf.clear4, %bf.value8
|
|
%bf.set10 = or i96 %bf.set5, %bf.clear
|
|
%retval.0.cast7 = bitcast %struct._my_struct* %retval to i96*
|
|
store i96 %bf.set10, i96* %retval.0.cast7, align 8
|
|
%retval.12.idx8 = getelementptr inbounds %struct._my_struct* %retval, i64 0, i32 1
|
|
%retval.12.cast9 = bitcast [4 x i8]* %retval.12.idx8 to i32*
|
|
store i32 %k.sroa.1.12.copyload, i32* %retval.12.cast9, align 4
|
|
%trunc = trunc i96 %bf.set10 to i64
|
|
%.fca.0.insert = insertvalue { i64, i64 } undef, i64 %trunc, 0
|
|
%retval.8.idx12 = getelementptr inbounds %struct._my_struct* %retval, i64 0, i32 0, i64 8
|
|
%retval.8.cast13 = bitcast i8* %retval.8.idx12 to i64*
|
|
%retval.8.load14 = load i64* %retval.8.cast13, align 8
|
|
%.fca.1.insert = insertvalue { i64, i64 } %.fca.0.insert, i64 %retval.8.load14, 1
|
|
ret { i64, i64 } %.fca.1.insert
|
|
}
|