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llvm-6502/test/CodeGen/ARM/stack-alignment.ll
Kristof Beyls d1cee9b3bc Fix large stack alignment codegen for ARM and Thumb2 targets 
This partially fixes PR13007 (ARM CodeGen fails with large stack
alignment): for ARM and Thumb2 targets, but not for Thumb1, as it
seems stack alignment for Thumb1 targets hasn't been supported at
all.

Producing an aligned stack pointer is done by zero-ing out the lower
bits of the stack pointer. The BIC instruction was used for this.
However, the immediate field of the BIC instruction only allows to
encode an immediate that can zero out up to a maximum of the 8 lower
bits. When a larger alignment is requested, a BIC instruction cannot
be used; llvm was silently producing incorrect code in this case.

This commit fixes code generation for large stack aligments by
using the BFC instruction instead, when the BFC instruction is
available.  When not, it uses 2 instructions: a right shift,
followed by a left shift to zero out the lower bits.

The lowering of ARM::Int_eh_sjlj_dispatchsetup still has code
that unconditionally uses BIC to realign the stack pointer, so it
very likely has the same problem. However, I wasn't able to
produce a test case for that. This commit adds an assert so that
the compiler will fail the assert instead of silently generating
wrong code if this is ever reached.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225446 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-08 15:09:14 +00:00

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6.3 KiB
LLVM
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; RUN: llc -verify-machineinstrs < %s -mtriple=armv4t | FileCheck %s -check-prefix=CHECK-v4A32
; RUN: llc -verify-machineinstrs < %s -mtriple=armv7a | FileCheck %s -check-prefix=CHECK-v7A32
; RUN: llc -verify-machineinstrs < %s -mtriple=thumbv7a | FileCheck %s -check-prefix=CHECK-THUMB2
; FIXME: There are no tests for Thumb1 since dynamic stack alignment is not supported for
; Thumb1.
define i32 @f_bic_can_be_used_align() nounwind {
entry:
; CHECK-LABEL: f_bic_can_be_used_align:
; CHECK-v7A32: bfc sp, #0, #8
; CHECK-v4A32: bic sp, sp, #255
; CHECK-THUMB2: mov r4, sp
; CHECK-THUMB2-NEXT: bfc r4, #0, #8
; CHECK-THUMB2-NEXT: mov sp, r4
%x = alloca i32, align 256
store volatile i32 0, i32* %x, align 256
ret i32 0
}
define i32 @f_too_large_for_bic_align() nounwind {
entry:
; CHECK-LABEL: f_too_large_for_bic_align:
; CHECK-v7A32: bfc sp, #0, #9
; CHECK-v4A32: lsr sp, sp, #9
; CHECK-v4A32: lsl sp, sp, #9
; CHECK-THUMB2: mov r4, sp
; CHECK-THUMB2-NEXT: bfc r4, #0, #9
; CHECK-THUMB2-NEXT: mov sp, r4
%x = alloca i32, align 512
store volatile i32 0, i32* %x, align 512
ret i32 0
}
define i8* @f_alignedDPRCS2Spills(double* %d) #0 {
entry:
; CHECK-LABEL: f_too_large_for_bic_align:
; CHECK-v7A32: bfc sp, #0, #12
; CHECK-v4A32: lsr sp, sp, #12
; CHECK-v4A32: lsl sp, sp, #12
; CHECK-THUMB2: bfc r4, #0, #12
; CHECK-THUMB2-NEXT: mov sp, r4
%a = alloca i8, align 4096
%0 = load double* %d, align 4
%arrayidx1 = getelementptr inbounds double* %d, i32 1
%1 = load double* %arrayidx1, align 4
%arrayidx2 = getelementptr inbounds double* %d, i32 2
%2 = load double* %arrayidx2, align 4
%arrayidx3 = getelementptr inbounds double* %d, i32 3
%3 = load double* %arrayidx3, align 4
%arrayidx4 = getelementptr inbounds double* %d, i32 4
%4 = load double* %arrayidx4, align 4
%arrayidx5 = getelementptr inbounds double* %d, i32 5
%5 = load double* %arrayidx5, align 4
%arrayidx6 = getelementptr inbounds double* %d, i32 6
%6 = load double* %arrayidx6, align 4
%arrayidx7 = getelementptr inbounds double* %d, i32 7
%7 = load double* %arrayidx7, align 4
%arrayidx8 = getelementptr inbounds double* %d, i32 8
%8 = load double* %arrayidx8, align 4
%arrayidx9 = getelementptr inbounds double* %d, i32 9
%9 = load double* %arrayidx9, align 4
%arrayidx10 = getelementptr inbounds double* %d, i32 10
%10 = load double* %arrayidx10, align 4
%arrayidx11 = getelementptr inbounds double* %d, i32 11
%11 = load double* %arrayidx11, align 4
%arrayidx12 = getelementptr inbounds double* %d, i32 12
%12 = load double* %arrayidx12, align 4
%arrayidx13 = getelementptr inbounds double* %d, i32 13
%13 = load double* %arrayidx13, align 4
%arrayidx14 = getelementptr inbounds double* %d, i32 14
%14 = load double* %arrayidx14, align 4
%arrayidx15 = getelementptr inbounds double* %d, i32 15
%15 = load double* %arrayidx15, align 4
%arrayidx16 = getelementptr inbounds double* %d, i32 16
%16 = load double* %arrayidx16, align 4
%arrayidx17 = getelementptr inbounds double* %d, i32 17
%17 = load double* %arrayidx17, align 4
%arrayidx18 = getelementptr inbounds double* %d, i32 18
%18 = load double* %arrayidx18, align 4
%arrayidx19 = getelementptr inbounds double* %d, i32 19
%19 = load double* %arrayidx19, align 4
%arrayidx20 = getelementptr inbounds double* %d, i32 20
%20 = load double* %arrayidx20, align 4
%arrayidx21 = getelementptr inbounds double* %d, i32 21
%21 = load double* %arrayidx21, align 4
%arrayidx22 = getelementptr inbounds double* %d, i32 22
%22 = load double* %arrayidx22, align 4
%arrayidx23 = getelementptr inbounds double* %d, i32 23
%23 = load double* %arrayidx23, align 4
%arrayidx24 = getelementptr inbounds double* %d, i32 24
%24 = load double* %arrayidx24, align 4
%arrayidx25 = getelementptr inbounds double* %d, i32 25
%25 = load double* %arrayidx25, align 4
%arrayidx26 = getelementptr inbounds double* %d, i32 26
%26 = load double* %arrayidx26, align 4
%arrayidx27 = getelementptr inbounds double* %d, i32 27
%27 = load double* %arrayidx27, align 4
%arrayidx28 = getelementptr inbounds double* %d, i32 28
%28 = load double* %arrayidx28, align 4
%arrayidx29 = getelementptr inbounds double* %d, i32 29
%29 = load double* %arrayidx29, align 4
%div = fdiv double %29, %28
%div30 = fdiv double %div, %27
%div31 = fdiv double %div30, %26
%div32 = fdiv double %div31, %25
%div33 = fdiv double %div32, %24
%div34 = fdiv double %div33, %23
%div35 = fdiv double %div34, %22
%div36 = fdiv double %div35, %21
%div37 = fdiv double %div36, %20
%div38 = fdiv double %div37, %19
%div39 = fdiv double %div38, %18
%div40 = fdiv double %div39, %17
%div41 = fdiv double %div40, %16
%div42 = fdiv double %div41, %15
%div43 = fdiv double %div42, %14
%div44 = fdiv double %div43, %13
%div45 = fdiv double %div44, %12
%div46 = fdiv double %div45, %11
%div47 = fdiv double %div46, %10
%div48 = fdiv double %div47, %9
%div49 = fdiv double %div48, %8
%div50 = fdiv double %div49, %7
%div51 = fdiv double %div50, %6
%div52 = fdiv double %div51, %5
%div53 = fdiv double %div52, %4
%div54 = fdiv double %div53, %3
%div55 = fdiv double %div54, %2
%div56 = fdiv double %div55, %1
%div57 = fdiv double %div56, %0
%div58 = fdiv double %0, %1
%div59 = fdiv double %div58, %2
%div60 = fdiv double %div59, %3
%div61 = fdiv double %div60, %4
%div62 = fdiv double %div61, %5
%div63 = fdiv double %div62, %6
%div64 = fdiv double %div63, %7
%div65 = fdiv double %div64, %8
%div66 = fdiv double %div65, %9
%div67 = fdiv double %div66, %10
%div68 = fdiv double %div67, %11
%div69 = fdiv double %div68, %12
%div70 = fdiv double %div69, %13
%div71 = fdiv double %div70, %14
%div72 = fdiv double %div71, %15
%div73 = fdiv double %div72, %16
%div74 = fdiv double %div73, %17
%div75 = fdiv double %div74, %18
%div76 = fdiv double %div75, %19
%div77 = fdiv double %div76, %20
%div78 = fdiv double %div77, %21
%div79 = fdiv double %div78, %22
%div80 = fdiv double %div79, %23
%div81 = fdiv double %div80, %24
%div82 = fdiv double %div81, %25
%div83 = fdiv double %div82, %26
%div84 = fdiv double %div83, %27
%div85 = fdiv double %div84, %28
%div86 = fdiv double %div85, %29
%mul = fmul double %div57, %div86
%conv = fptosi double %mul to i32
%add.ptr = getelementptr inbounds i8* %a, i32 %conv
ret i8* %add.ptr
}
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