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llvm-6502/test/CodeGen/X86/stackmap-nops.ll
Lang Hames b96e833817 [X86] Optimize stackmap shadows on X86. 
This patch minimizes the number of nops that must be emitted on X86 to satisfy
stackmap shadow constraints.

To minimize the number of nops inserted, the X86AsmPrinter now records the
size of the most recent stackmap's shadow in the StackMapShadowTracker class,
and tracks the number of instruction bytes emitted since the that stackmap
instruction was encountered. Padding is emitted (if it is required at all)
immediately before the next stackmap/patchpoint instruction, or at the end of
the basic block.

This optimization should reduce code-size and improve performance for people
using the llvm stackmap intrinsic on X86.

<rdar://problem/14959522>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213892 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-24 20:40:55 +00:00

232 lines
6.7 KiB
LLVM
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; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 -disable-fp-elim | FileCheck %s
define void @nop_test() {
entry:
; CHECK-LABEL: nop_test:
; CHECK: nop
; CHECK: xchgw %ax, %ax
; CHECK: nopl (%rax)
; CHECK: nopl 8(%rax)
; CHECK: nopl 8(%rax,%rax)
; CHECK: nopw 8(%rax,%rax)
; CHECK: nopl 512(%rax)
; CHECK: nopl 512(%rax,%rax)
; CHECK: nopw 512(%rax,%rax)
; CHECK: nopw %cs:512(%rax,%rax)
; 11
; CHECK: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 12
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 13
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 14
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 15
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 16
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nop
; 17
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: xchgw %ax, %ax
; 18
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopl (%rax)
; 19
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopl 8(%rax)
; 20
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopl 8(%rax,%rax)
; 21
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopw 8(%rax,%rax)
; 22
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopl 512(%rax)
; 23
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopl 512(%rax,%rax)
; 24
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopw 512(%rax,%rax)
; 25
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 26
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 27
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 28
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
;29
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; 30
; CHECK: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: .byte 102
; CHECK-NEXT: nopw %cs:512(%rax,%rax)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 0, i32 0)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 1, i32 1)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 2, i32 2)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 3, i32 3)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 4, i32 4)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 5, i32 5)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 6, i32 6)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 7, i32 7)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 8, i32 8)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 9, i32 9)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 10, i32 10)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 11, i32 11)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 12, i32 12)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 13, i32 13)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 14, i32 14)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 15, i32 15)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 16, i32 16)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 17, i32 17)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 18, i32 18)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 19, i32 19)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 20, i32 20)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 21, i32 21)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 22, i32 22)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 23, i32 23)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 24, i32 24)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 25, i32 25)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 26, i32 26)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 27, i32 27)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 28, i32 28)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 29, i32 29)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 30, i32 30)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 31, i32 0)
ret void
}
declare void @llvm.experimental.stackmap(i64, i32, ...)
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