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author | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2015-05-06 19:11:20 +0000 |
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committer | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2015-05-06 19:11:20 +0000 |
commit | 653c1099b40957d836dd85d81449e35a22e4558d (patch) | |
tree | cb757287df3e8abb074436719f4743f5e1c5b39e /llvm/test | |
parent | 61533772196bf287dca07e1a9a38915c70a20c46 (diff) | |
download | bcm5719-llvm-653c1099b40957d836dd85d81449e35a22e4558d.tar.gz bcm5719-llvm-653c1099b40957d836dd85d81449e35a22e4558d.zip |
DwarfDebug: Emit number of bytes in .debug_loc entry directly
Emit the number of bytes in a `.debug_loc` entry directly. The old code
created temp labels (expensive), emitted the difference between them,
and then emitted one on each side of the relevant bytes.
(I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`
(the optimized version of ld64's `-save-temps` when linking the
`verify-uselistorder` executable in an LTO bootstrap). I've hacked
`MCContext::Allocate()` to just call `malloc()` instead of using the
`BumpPtrAllocator` so that the heap profile is easier to read. As far
as peak memory is concerned, `MCContext::Allocate()` is equivalent to a
leak, since it only gets freed at process teardown.
In my heap profile, this patch drops memory usage of
`DwarfDebug::emitDebugLoc()` from 132.56 MB (11.4%) down to 29.86 MB
(2.7%) at peak memory. Some of that must be noise from `SmallVector`
(or other) allocations -- peak memory only dropped from 1160 MB down to
1100 MB -- but this nevertheless shaves 5% off the top.)
llvm-svn: 236629
Diffstat (limited to 'llvm/test')
-rw-r--r-- | llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll | 3 | ||||
-rw-r--r-- | llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll | 10 | ||||
-rw-r--r-- | llvm/test/DebugInfo/X86/dbg-value-range.ll | 5 |
3 files changed, 4 insertions, 14 deletions
diff --git a/llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll b/llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll index e14365ac848..3b99e91915f 100644 --- a/llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll +++ b/llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll @@ -2,8 +2,7 @@ ; RUN: llc -mtriple=x86_64-pc-linux -O2 -regalloc=basic < %s | FileCheck %s ; Test to check .debug_loc support. This test case emits many debug_loc entries. -; CHECK: .short {{.*}} # Loc expr size -; CHECK-NEXT: .Ltmp +; CHECK: .short 1 # Loc expr size ; CHECK-NEXT: DW_OP_reg %0 = type { double } diff --git a/llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll b/llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll index 788853e4308..3670c556aa7 100644 --- a/llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll +++ b/llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll @@ -77,18 +77,12 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon ; CHECK-NEXT: .quad [[SET1]] ; CHECK-NEXT: [[SET2:.*]] = [[LABEL]]-Lfunc_begin0 ; CHECK-NEXT: .quad [[SET2]] -; CHECK-NEXT: Lset{{.*}} = Ltmp{{.*}}-Ltmp{{.*}} ## Loc expr size -; CHECK-NEXT: .short Lset{{.*}} -; CHECK-NEXT: Ltmp{{.*}}: +; CHECK-NEXT: .short 1 ## Loc expr size ; CHECK-NEXT: .byte 85 -; CHECK-NEXT: Ltmp{{.*}}: ; CHECK-NEXT: [[SET3:.*]] = [[LABEL]]-Lfunc_begin0 ; CHECK-NEXT: .quad [[SET3]] ; CHECK-NEXT: [[SET4:.*]] = [[CLOBBER]]-Lfunc_begin0 ; CHECK-NEXT: .quad [[SET4]] -; CHECK-NEXT: Lset{{.*}} = Ltmp{{.*}}-Ltmp{{.*}} ## Loc expr size -; CHECK-NEXT: .short Lset{{.*}} -; CHECK-NEXT: Ltmp{{.*}}: +; CHECK-NEXT: .short 1 ## Loc expr size ; CHECK-NEXT: .byte 83 -; CHECK-NEXT: Ltmp{{.*}}: !38 = !{i32 1, !"Debug Info Version", i32 3} diff --git a/llvm/test/DebugInfo/X86/dbg-value-range.ll b/llvm/test/DebugInfo/X86/dbg-value-range.ll index fcde006320d..a8fa9073fa7 100644 --- a/llvm/test/DebugInfo/X86/dbg-value-range.ll +++ b/llvm/test/DebugInfo/X86/dbg-value-range.ll @@ -55,11 +55,8 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon ;CHECK-NEXT: .quad ;CHECK-NEXT: [[CLOBBER_OFF:Lset.*]] = [[CLOBBER]]-{{.*}} ;CHECK-NEXT: .quad [[CLOBBER_OFF]] -;CHECK-NEXT: Lset{{.*}} = Ltmp{{.*}}-Ltmp{{.*}} -;CHECK-NEXT: .short Lset -;CHECK-NEXT: Ltmp +;CHECK-NEXT: .short 1 ## Loc expr size ;CHECK-NEXT: .byte 85 ## DW_OP_reg -;CHECK-NEXT: Ltmp ;CHECK-NEXT: .quad 0 ;CHECK-NEXT: .quad 0 !24 = !{i32 1, !"Debug Info Version", i32 3} |