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4e06f54193
This patch implements dynamic realignment of stack objects for targets with a non-realigned stack pointer. Behaviour in FunctionLoweringInfo is changed so that for a target that has StackRealignable set to false, over-aligned static allocas are considered to be variable-sized objects and are handled with DYNAMIC_STACKALLOC nodes. It would be good to group aligned allocas into a single big alloca as an optimization, but this is yet todo. SystemZ benefits from this, due to its stack frame layout. New tests SystemZ/alloca-03.ll for aligned allocas, and SystemZ/alloca-04.ll for "no-realign-stack" attribute on functions. Review and help from Ulrich Weigand and Hal Finkel. llvm-svn: 254227
85 lines
1.8 KiB
LLVM
85 lines
1.8 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; Allocate 8 bytes, no need to align stack.
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define void @f0() {
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; CHECK-LABEL: f0:
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; CHECK: aghi %r15, -168
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; CHECK-NOT: nil
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; CHECK: mvghi 160(%r15), 10
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; CHECK: aghi %r15, 168
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%x = alloca i64
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store volatile i64 10, i64* %x
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ret void
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}
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; Allocate %len * 8, no need to align stack.
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define void @f1(i64 %len) {
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; CHECK-LABEL: f1:
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; CHECK: sllg %r0, %r2, 3
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; CHECK: lgr %r1, %r15
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; CHECK: sgr %r1, %r0
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; CHECK-NOT: ngr
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; CHECK: lgr %r15, %r1
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; CHECK: la %r1, 160(%r1)
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; CHECK: mvghi 0(%r1), 10
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%x = alloca i64, i64 %len
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store volatile i64 10, i64* %x
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ret void
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}
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; Static alloca, align 128.
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define void @f2() {
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; CHECK-LABEL: f2:
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; CHECK: aghi %r1, -128
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; CHECK: lgr %r15, %r1
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; CHECK: la %r1, 280(%r1)
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; CHECK: nill %r1, 65408
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; CHECK: mvghi 0(%r1), 10
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%x = alloca i64, i64 1, align 128
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store volatile i64 10, i64* %x, align 128
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ret void
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}
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; Dynamic alloca, align 128.
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define void @f3(i64 %len) {
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; CHECK-LABEL: f3:
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; CHECK: sllg %r1, %r2, 3
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; CHECK: la %r0, 120(%r1)
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; CHECK: lgr %r1, %r15
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; CHECK: sgr %r1, %r0
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; CHECK: lgr %r15, %r1
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; CHECK: la %r1, 280(%r1)
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; CHECK: nill %r1, 65408
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; CHECK: mvghi 0(%r1), 10
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%x = alloca i64, i64 %len, align 128
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store volatile i64 10, i64* %x, align 128
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ret void
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}
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; Static alloca w/out alignment - part of frame.
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define void @f4() {
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; CHECK-LABEL: f4:
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; CHECK: aghi %r15, -168
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; CHECK: mvhi 164(%r15), 10
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; CHECK: aghi %r15, 168
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%x = alloca i32
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store volatile i32 10, i32* %x
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ret void
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}
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; Static alloca of one i32, aligned by 128.
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define void @f5() {
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; CHECK-LABEL: f5:
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; CHECK: lgr %r1, %r15
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; CHECK: aghi %r1, -128
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; CHECK: lgr %r15, %r1
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; CHECK: la %r1, 280(%r1)
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; CHECK: nill %r1, 65408
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; CHECK: mvhi 0(%r1), 10
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%x = alloca i32, i64 1, align 128
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store volatile i32 10, i32* %x
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ret void
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}
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