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- Stop simplifycfg from duplicating "ret" instructions into unconditional

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branches. PR8575, rdar://5134905, rdar://8911460.
- Allow codegen tail duplication to dup small return blocks after register
  allocation is done.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124462 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-01-28 02:19:21 +00:00
parent c3a20bab75
commit 40f64cb0de
11 changed files with 78 additions and 82 deletions
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test/CodeGen/X86/critical-edge-split.ll
-50
View File
@@ -1,50 +0,0 @@
; RUN: llc < %s -mtriple=i386-apple-darwin -o /dev/null -stats -info-output-file - | grep asm-printer | grep 29
%CC = type { %Register }
%II = type { %"struct.XX::II::$_74" }
%JITFunction = type %YYValue* (%CC*, %YYValue**)
%YYValue = type { i32 (...)** }
%Register = type { %"struct.XX::ByteCodeFeatures" }
%"struct.XX::ByteCodeFeatures" = type { i32 }
%"struct.XX::II::$_74" = type { i8* }
@llvm.used = appending global [1 x i8*] [ i8* bitcast (%JITFunction* @loop to i8*) ], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
define %YYValue* @loop(%CC*, %YYValue**) nounwind {
; <label>:2
%3 = getelementptr %CC* %0, i32 -9 ; <%CC*> [#uses=1]
%4 = bitcast %CC* %3 to %YYValue** ; <%YYValue**> [#uses=2]
%5 = load %YYValue** %4 ; <%YYValue*> [#uses=3]
%unique_1.i = ptrtoint %YYValue* %5 to i1 ; <i1> [#uses=1]
br i1 %unique_1.i, label %loop, label %11
loop: ; preds = %6, %2
%.1 = phi %YYValue* [ inttoptr (i32 1 to %YYValue*), %2 ], [ %intAddValue, %6 ] ; <%YYValue*> [#uses=3]
%immediateCmp = icmp slt %YYValue* %.1, %5 ; <i1> [#uses=1]
br i1 %immediateCmp, label %6, label %8
; <label>:6 ; preds = %loop
%lhsInt = ptrtoint %YYValue* %.1 to i32 ; <i32> [#uses=1]
%7 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %lhsInt, i32 2) ; <{ i32, i1 }> [#uses=2]
%intAdd = extractvalue { i32, i1 } %7, 0 ; <i32> [#uses=1]
%intAddValue = inttoptr i32 %intAdd to %YYValue* ; <%YYValue*> [#uses=1]
%intAddOverflow = extractvalue { i32, i1 } %7, 1 ; <i1> [#uses=1]
br i1 %intAddOverflow, label %.loopexit, label %loop
; <label>:8 ; preds = %loop
ret %YYValue* inttoptr (i32 10 to %YYValue*)
.loopexit: ; preds = %6
%9 = bitcast %CC* %0 to %YYValue** ; <%YYValue**> [#uses=1]
store %YYValue* %.1, %YYValue** %9
store %YYValue* %5, %YYValue** %4
%10 = call fastcc %YYValue* @foobar(%II* inttoptr (i32 3431104 to %II*), %CC* %0, %YYValue** %1) ; <%YYValue*> [#uses=1]
ret %YYValue* %10
; <label>:11 ; preds = %2
%12 = call fastcc %YYValue* @foobar(%II* inttoptr (i32 3431080 to %II*), %CC* %0, %YYValue** %1) ; <%YYValue*> [#uses=1]
ret %YYValue* %12
}
declare fastcc %YYValue* @foobar(%II*, %CC*, %YYValue**) nounwind
declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32) nounwind
test/CodeGen/X86/loop-blocks.ll
+6 -5
View File
@@ -70,6 +70,7 @@ exit:
; Same as slightly_more_involved, but block_a is now a CFG diamond with
; fallthrough edges which should be preserved.
; "callq block_a_merge_func" is tail duped.
; CHECK: yet_more_involved:
; CHECK: jmp .LBB2_1
@@ -78,12 +79,12 @@ exit:
; CHECK-NEXT: callq bar99
; CHECK-NEXT: callq get
; CHECK-NEXT: cmpl $2999, %eax
; CHECK-NEXT: jg .LBB2_6
; CHECK-NEXT: callq block_a_true_func
; CHECK-NEXT: jmp .LBB2_7
; CHECK-NEXT: .LBB2_6:
; CHECK-NEXT: jle .LBB2_5
; CHECK-NEXT: callq block_a_false_func
; CHECK-NEXT: .LBB2_7:
; CHECK-NEXT: callq block_a_merge_func
; CHECK-NEXT: jmp .LBB2_1
; CHECK-NEXT: .LBB2_5:
; CHECK-NEXT: callq block_a_true_func
; CHECK-NEXT: callq block_a_merge_func
; CHECK-NEXT: .LBB2_1:
; CHECK-NEXT: callq body