llvm is generating poor code for dynamic alloca, I'll fix that later.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101383
91177308-0d34-0410-b5e6-
96231b3b80d8
SDValue Chain = N->getOperand(0);
SDValue Size = N->getOperand(1);
SDValue Align = N->getOperand(2);
- SDValue SP = CurDAG->getRegister(ARM::SP, MVT::i32);
+ SDValue SP = CurDAG->getCopyFromReg(Chain, dl, ARM::SP, MVT::i32);
int32_t AlignVal = cast<ConstantSDNode>(Align)->getSExtValue();
if (AlignVal < 0)
// We need to align the stack. Use Thumb1 tAND which is the only thumb
--- /dev/null
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -O3 | FileCheck %s
+; rdar://7493908
+
+; Make sure the result of the first dynamic_alloc isn't copied back to sp more
+; than once. We'll deal with poor codegen later.
+
+define arm_apcscc void @t() nounwind ssp {
+entry:
+; CHECK: t:
+; CHECK: mvn r0, #7
+; CHECK: ands sp, r0
+; CHECK: mov r1, sp
+; CHECK: mov sp, r1
+; Yes, this is stupid codegen, but it's correct.
+; CHECK: sub sp, #16
+; CHECK: mov r1, sp
+; CHECK: mov sp, r1
+; CHECK: ands sp, r0
+ %size = mul i32 8, 2
+ %vla_a = alloca i8, i32 %size, align 8
+ %vla_b = alloca i8, i32 %size, align 8
+ unreachable
+}