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https://github.com/RPCS3/llvm-mirror.git
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86eb682529
Summary: This is last in of a series of patches to evolve ADCE.cpp to support removing of unnecessary control flow. This patch adds the code to update the control and data flow graphs to remove the dead control flow. Also update unit tests to test the capability to remove dead, may-be-infinite loop which is enabled by the switch -adce-remove-loops. Previous patches: D23824 [ADCE] Add handling of PHI nodes when removing control flow D23559 [ADCE] Add control dependence computation D23225 [ADCE] Modify data structures to support removing control flow D23065 [ADCE] Refactor anticipating new functionality (NFC) D23102 [ADCE] Refactoring for new functionality (NFC) Reviewers: dberlin, majnemer, nadav, mehdi_amini Subscribers: llvm-commits, david2050, freik, twoh Differential Revision: https://reviews.llvm.org/D24918 llvm-svn: 289548
103 lines
4.0 KiB
LLVM
103 lines
4.0 KiB
LLVM
; RUN: opt < %s -adce -S | FileCheck %s
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; RUN: opt < %s -adce -adce-remove-loops -S | FileCheck %s
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%FILE = type { i32, i8*, i8*, i8, i8, i32, i32, i32 }
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%spec_fd_t = type { i32, i32, i32, i8* }
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@__iob = external global [20 x %FILE] ; <[20 x %FILE]*> [#uses=1]
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@dbglvl = global i32 4 ; <i32*> [#uses=3]
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@spec_fd = external global [3 x %spec_fd_t] ; <[3 x %spec_fd_t]*> [#uses=4]
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@.LC9 = internal global [34 x i8] c"spec_read: fd=%d, > MAX_SPEC_FD!\0A\00" ; <[34 x i8]*> [#uses=1]
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@.LC10 = internal global [4 x i8] c"EOF\00" ; <[4 x i8]*> [#uses=1]
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@.LC11 = internal global [4 x i8] c"%d\0A\00" ; <[4 x i8]*> [#uses=1]
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@.LC12 = internal global [17 x i8] c"spec_getc: %d = \00" ; <[17 x i8]*> [#uses=1]
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declare i32 @fprintf(%FILE*, i8*, ...)
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declare void @exit(i32)
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declare i32 @remove(i8*)
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declare i32 @fputc(i32, %FILE*)
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declare i32 @fwrite(i8*, i32, i32, %FILE*)
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declare void @perror(i8*)
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define i32 @spec_getc(i32 %fd) {
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%reg109 = load i32, i32* @dbglvl ; <i32> [#uses=1]
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%cond266 = icmp sle i32 %reg109, 4 ; <i1> [#uses=1]
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; CHECKL br label %bb3
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br i1 %cond266, label %bb3, label %bb2
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bb2: ; preds = %0
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%cast273 = getelementptr [17 x i8], [17 x i8]* @.LC12, i64 0, i64 0 ; <i8*> [#uses=0]
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br label %bb3
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bb3: ; preds = %bb2, %0
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%cond267 = icmp sle i32 %fd, 3 ; <i1> [#uses=1]
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br i1 %cond267, label %bb5, label %bb4
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bb4: ; preds = %bb3
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%reg111 = getelementptr [20 x %FILE], [20 x %FILE]* @__iob, i64 0, i64 1, i32 3 ; <i8*> [#uses=1]
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%cast274 = getelementptr [34 x i8], [34 x i8]* @.LC9, i64 0, i64 0 ; <i8*> [#uses=0]
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%cast282 = bitcast i8* %reg111 to %FILE* ; <%FILE*> [#uses=0]
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call void @exit( i32 1 )
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br label %UnifiedExitNode
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bb5: ; preds = %bb3
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%reg107-idxcast1 = sext i32 %fd to i64 ; <i64> [#uses=2]
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%reg107-idxcast2 = sext i32 %fd to i64 ; <i64> [#uses=1]
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%reg1311 = getelementptr [3 x %spec_fd_t], [3 x %spec_fd_t]* @spec_fd, i64 0, i64 %reg107-idxcast2 ; <%spec_fd_t*> [#uses=1]
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%idx1 = getelementptr [3 x %spec_fd_t], [3 x %spec_fd_t]* @spec_fd, i64 0, i64 %reg107-idxcast1, i32 2 ; <i32*> [#uses=1]
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%reg1321 = load i32, i32* %idx1 ; <i32> [#uses=3]
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%idx2 = getelementptr %spec_fd_t, %spec_fd_t* %reg1311, i64 0, i32 1 ; <i32*> [#uses=1]
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%reg1331 = load i32, i32* %idx2 ; <i32> [#uses=1]
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%cond270 = icmp slt i32 %reg1321, %reg1331 ; <i1> [#uses=1]
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br i1 %cond270, label %bb9, label %bb6
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bb6: ; preds = %bb5
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%reg134 = load i32, i32* @dbglvl ; <i32> [#uses=1]
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%cond271 = icmp sle i32 %reg134, 4 ; <i1> [#uses=1]
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; CHECK: br label %bb8
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br i1 %cond271, label %bb8, label %bb7
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bb7: ; preds = %bb6
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%cast277 = getelementptr [4 x i8], [4 x i8]* @.LC10, i64 0, i64 0 ; <i8*> [#uses=0]
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br label %bb8
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bb8: ; preds = %bb7, %bb6
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br label %UnifiedExitNode
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bb9: ; preds = %bb5
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%reg107-idxcast3 = sext i32 %fd to i64 ; <i64> [#uses=1]
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%idx3 = getelementptr [3 x %spec_fd_t], [3 x %spec_fd_t]* @spec_fd, i64 0, i64 %reg107-idxcast3, i32 3 ; <i8**> [#uses=1]
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%reg1601 = load i8*, i8** %idx3 ; <i8*> [#uses=1]
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%reg132-idxcast1 = sext i32 %reg1321 to i64 ; <i64> [#uses=1]
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%idx4 = getelementptr i8, i8* %reg1601, i64 %reg132-idxcast1 ; <i8*> [#uses=1]
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%reg1621 = load i8, i8* %idx4 ; <i8> [#uses=2]
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%cast108 = zext i8 %reg1621 to i64 ; <i64> [#uses=0]
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%reg157 = add i32 %reg1321, 1 ; <i32> [#uses=1]
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%idx5 = getelementptr [3 x %spec_fd_t], [3 x %spec_fd_t]* @spec_fd, i64 0, i64 %reg107-idxcast1, i32 2 ; <i32*> [#uses=1]
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store i32 %reg157, i32* %idx5
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%reg163 = load i32, i32* @dbglvl ; <i32> [#uses=1]
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%cond272 = icmp sle i32 %reg163, 4 ; <i1> [#uses=1]
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; CHECK: br label %bb11
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br i1 %cond272, label %bb11, label %bb10
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bb10: ; preds = %bb9
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%cast279 = getelementptr [4 x i8], [4 x i8]* @.LC11, i64 0, i64 0 ; <i8*> [#uses=0]
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br label %bb11
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bb11: ; preds = %bb10, %bb9
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%cast291 = zext i8 %reg1621 to i32 ; <i32> [#uses=1]
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br label %UnifiedExitNode
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UnifiedExitNode: ; preds = %bb11, %bb8, %bb4
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%UnifiedRetVal = phi i32 [ 42, %bb4 ], [ -1, %bb8 ], [ %cast291, %bb11 ] ; <i32> [#uses=1]
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ret i32 %UnifiedRetVal
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}
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declare i32 @puts(i8*)
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declare i32 @printf(i8*, ...)
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