2009-12-17-pre-regalloc-taildup.ll
3.96 KB
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; RUN: llc -O3 < %s | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
target triple = "thumbv7-apple-darwin10"
; This test should not produce any spills, even when tail duplication creates lots of phi nodes.
; CHECK-NOT: push
; CHECK-NOT: pop
; CHECK: bx lr
@codetable.2928 = internal constant [5 x i8*] [i8* blockaddress(@interpret_threaded, %RETURN), i8* blockaddress(@interpret_threaded, %INCREMENT), i8* blockaddress(@interpret_threaded, %DECREMENT), i8* blockaddress(@interpret_threaded, %DOUBLE), i8* blockaddress(@interpret_threaded, %SWAPWORD)] ; <[5 x i8*]*> [#uses=5]
@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 (i8*)* @interpret_threaded to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
define i32 @interpret_threaded(i8* nocapture %opcodes) nounwind readonly optsize {
entry:
%0 = load i8, i8* %opcodes, align 1 ; <i8> [#uses=1]
%1 = zext i8 %0 to i32 ; <i32> [#uses=1]
%2 = getelementptr inbounds [5 x i8*], [5 x i8*]* @codetable.2928, i32 0, i32 %1 ; <i8**> [#uses=1]
br label %bb
bb: ; preds = %bb.backedge, %entry
%indvar = phi i32 [ %phitmp, %bb.backedge ], [ 1, %entry ] ; <i32> [#uses=2]
%gotovar.22.0.in = phi i8** [ %gotovar.22.0.in.be, %bb.backedge ], [ %2, %entry ] ; <i8**> [#uses=1]
%result.0 = phi i32 [ %result.0.be, %bb.backedge ], [ 0, %entry ] ; <i32> [#uses=6]
%opcodes_addr.0 = getelementptr i8, i8* %opcodes, i32 %indvar ; <i8*> [#uses=4]
%gotovar.22.0 = load i8*, i8** %gotovar.22.0.in, align 4 ; <i8*> [#uses=1]
indirectbr i8* %gotovar.22.0, [label %RETURN, label %INCREMENT, label %DECREMENT, label %DOUBLE, label %SWAPWORD]
RETURN: ; preds = %bb
ret i32 %result.0
INCREMENT: ; preds = %bb
%3 = add nsw i32 %result.0, 1 ; <i32> [#uses=1]
%4 = load i8, i8* %opcodes_addr.0, align 1 ; <i8> [#uses=1]
%5 = zext i8 %4 to i32 ; <i32> [#uses=1]
%6 = getelementptr inbounds [5 x i8*], [5 x i8*]* @codetable.2928, i32 0, i32 %5 ; <i8**> [#uses=1]
br label %bb.backedge
bb.backedge: ; preds = %SWAPWORD, %DOUBLE, %DECREMENT, %INCREMENT
%gotovar.22.0.in.be = phi i8** [ %20, %SWAPWORD ], [ %14, %DOUBLE ], [ %10, %DECREMENT ], [ %6, %INCREMENT ] ; <i8**> [#uses=1]
%result.0.be = phi i32 [ %17, %SWAPWORD ], [ %11, %DOUBLE ], [ %7, %DECREMENT ], [ %3, %INCREMENT ] ; <i32> [#uses=1]
%phitmp = add i32 %indvar, 1 ; <i32> [#uses=1]
br label %bb
DECREMENT: ; preds = %bb
%7 = add i32 %result.0, -1 ; <i32> [#uses=1]
%8 = load i8, i8* %opcodes_addr.0, align 1 ; <i8> [#uses=1]
%9 = zext i8 %8 to i32 ; <i32> [#uses=1]
%10 = getelementptr inbounds [5 x i8*], [5 x i8*]* @codetable.2928, i32 0, i32 %9 ; <i8**> [#uses=1]
br label %bb.backedge
DOUBLE: ; preds = %bb
%11 = shl i32 %result.0, 1 ; <i32> [#uses=1]
%12 = load i8, i8* %opcodes_addr.0, align 1 ; <i8> [#uses=1]
%13 = zext i8 %12 to i32 ; <i32> [#uses=1]
%14 = getelementptr inbounds [5 x i8*], [5 x i8*]* @codetable.2928, i32 0, i32 %13 ; <i8**> [#uses=1]
br label %bb.backedge
SWAPWORD: ; preds = %bb
%15 = shl i32 %result.0, 16 ; <i32> [#uses=1]
%16 = ashr i32 %result.0, 16 ; <i32> [#uses=1]
%17 = or i32 %15, %16 ; <i32> [#uses=1]
%18 = load i8, i8* %opcodes_addr.0, align 1 ; <i8> [#uses=1]
%19 = zext i8 %18 to i32 ; <i32> [#uses=1]
%20 = getelementptr inbounds [5 x i8*], [5 x i8*]* @codetable.2928, i32 0, i32 %19 ; <i8**> [#uses=1]
br label %bb.backedge
}