cbdccb30c2
If a virtual register is not assigned preferred physical register, it means some COPY instructions will be changed to real register move instructions. In this case we can try to split the virtual register in colder blocks, if success, the original COPY instructions can be deleted, and the new COPY instructions in colder blocks will be generated as register move instructions. It results in fewer dynamic register move instructions executed. The new test case split-reg-with-hint.ll gives an example, the hot path contains 24 instructions without this patch, now it is only 4 instructions with this patch. Differential Revision: https://reviews.llvm.org/D156491
177 lines
7.3 KiB
LLVM
177 lines
7.3 KiB
LLVM
; RUN: llc -verify-machineinstrs -mcpu=pwr7 < %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr7 -ppc-gen-isel=false < %s | FileCheck --check-prefix=CHECK-NO-ISEL %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; Function Attrs: nounwind
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define void @jbd2_journal_commit_transaction(ptr %journal, i64 %inp1, i32 %inp2,
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ptr %inp3, ptr %inp4,
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ptr %inp5, i1 %inp6,
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i1 %inp7, i1 %inp8) #0 {
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entry:
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br i1 undef, label %do.body, label %if.then5
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if.then5: ; preds = %entry
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unreachable
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do.body: ; preds = %entry
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br i1 undef, label %do.body.i, label %trace_jbd2_start_commit.exit
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do.body.i: ; preds = %do.body
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unreachable
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trace_jbd2_start_commit.exit: ; preds = %do.body
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br i1 undef, label %do.body.i1116, label %trace_jbd2_commit_locking.exit
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do.body.i1116: ; preds = %trace_jbd2_start_commit.exit
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br i1 undef, label %if.end.i1123, label %do.body5.i1122
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do.body5.i1122: ; preds = %do.body.i1116
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unreachable
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if.end.i1123: ; preds = %do.body.i1116
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br label %trace_jbd2_commit_locking.exit
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trace_jbd2_commit_locking.exit: ; preds = %if.end.i1123, %trace_jbd2_start_commit.exit
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br i1 undef, label %spin_unlock.exit1146, label %if.then.i.i.i.i1144
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if.then.i.i.i.i1144: ; preds = %trace_jbd2_commit_locking.exit
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unreachable
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spin_unlock.exit1146: ; preds = %trace_jbd2_commit_locking.exit
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br i1 undef, label %spin_unlock.exit1154, label %if.then.i.i.i.i1152
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if.then.i.i.i.i1152: ; preds = %spin_unlock.exit1146
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br label %spin_unlock.exit1154
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spin_unlock.exit1154: ; preds = %if.then.i.i.i.i1152, %spin_unlock.exit1146
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br i1 undef, label %do.body.i1159, label %trace_jbd2_commit_flushing.exit
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do.body.i1159: ; preds = %spin_unlock.exit1154
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unreachable
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trace_jbd2_commit_flushing.exit: ; preds = %spin_unlock.exit1154
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br i1 undef, label %for.end.i, label %for.body.lr.ph.i
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for.body.lr.ph.i: ; preds = %trace_jbd2_commit_flushing.exit
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br i1 undef, label %spin_unlock.exit.i, label %if.then.i.i.i.i.i
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if.then.i.i.i.i.i: ; preds = %for.body.lr.ph.i
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unreachable
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spin_unlock.exit.i: ; preds = %for.body.lr.ph.i
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unreachable
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for.end.i: ; preds = %trace_jbd2_commit_flushing.exit
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br i1 undef, label %journal_submit_data_buffers.exit, label %if.then.i.i.i.i31.i
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if.then.i.i.i.i31.i: ; preds = %for.end.i
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unreachable
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journal_submit_data_buffers.exit: ; preds = %for.end.i
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br i1 undef, label %if.end103, label %if.then102
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if.then102: ; preds = %journal_submit_data_buffers.exit
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unreachable
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if.end103: ; preds = %journal_submit_data_buffers.exit
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br i1 undef, label %do.body.i1182, label %trace_jbd2_commit_logging.exit
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do.body.i1182: ; preds = %if.end103
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unreachable
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trace_jbd2_commit_logging.exit: ; preds = %if.end103
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br i1 undef, label %for.end.i1287, label %for.body.i1277
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for.body.i1277: ; preds = %trace_jbd2_commit_logging.exit
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unreachable
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for.end.i1287: ; preds = %trace_jbd2_commit_logging.exit
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br i1 undef, label %journal_finish_inode_data_buffers.exit, label %if.then.i.i.i.i84.i
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if.then.i.i.i.i84.i: ; preds = %for.end.i1287
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unreachable
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journal_finish_inode_data_buffers.exit: ; preds = %for.end.i1287
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br i1 undef, label %if.end256, label %if.then249
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if.then249: ; preds = %journal_finish_inode_data_buffers.exit
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unreachable
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if.end256: ; preds = %journal_finish_inode_data_buffers.exit
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br i1 undef, label %do.body277, label %if.then260
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if.then260: ; preds = %if.end256
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br label %do.body277
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do.body277: ; preds = %if.then260, %if.end256
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br label %while.body318
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while.body318: ; preds = %wait_on_buffer.exit, %do.body277
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%tobool.i1295 = icmp eq i64 %inp1, 0
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br i1 %tobool.i1295, label %wait_on_buffer.exit, label %if.then.i1296
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if.then.i1296: ; preds = %while.body318
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unreachable
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wait_on_buffer.exit: ; preds = %while.body318
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br i1 %inp6, label %do.body378, label %while.body318
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do.body378: ; preds = %wait_on_buffer.exit
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br i1 %inp7, label %while.end418, label %while.body392.lr.ph
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while.body392.lr.ph: ; preds = %do.body378
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br label %while.body392
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while.body392: ; preds = %wait_on_buffer.exit1319, %while.body392.lr.ph
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%0 = load ptr, ptr undef, align 8
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%add.ptr399 = getelementptr inbounds i8, ptr %0, i64 -72
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%tobool.i1316 = icmp eq i64 %inp1, 0
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br i1 %tobool.i1316, label %wait_on_buffer.exit1319, label %if.then.i1317
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if.then.i1317: ; preds = %while.body392
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unreachable
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wait_on_buffer.exit1319: ; preds = %while.body392
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%1 = load volatile i64, ptr %add.ptr399, align 8
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%conv.i.i1322 = and i64 %1, 1
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%lnot404 = icmp eq i64 %conv.i.i1322, 0
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%.err.4 = select i1 %lnot404, i32 -5, i32 %inp2
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%2 = call i64 asm sideeffect "1:.long 0x7c0000a8 $| ((($0) & 0x1f) << 21) $| (((0) & 0x1f) << 16) $| ((($3) & 0x1f) << 11) $| (((0) & 0x1) << 0) \0Aandc $0,$0,$2\0Astdcx. $0,0,$3\0Abne- 1b\0A", "=&r,=*m,r,r,*m,~{cc},~{memory}"(ptr elementtype(i64) %add.ptr399, i64 262144, ptr %add.ptr399, ptr elementtype(i64) %add.ptr399) #1
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%prev.i.i.i1325 = getelementptr inbounds i8, ptr %0, i64 8
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%3 = load ptr, ptr %inp4, align 8
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store ptr %3, ptr %inp5, align 8
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call void @__brelse(ptr %3) #1
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br i1 %inp8, label %while.end418, label %while.body392
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; CHECK-LABEL: @jbd2_journal_commit_transaction
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; CHECK-NO-ISEL-LABEL: @jbd2_journal_commit_transaction
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; CHECK: andi.
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; CHECK: crmove
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; CHECK: stdcx.
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; CHECK: iselgt {{[0-9]+}}, {{[0-9]+}}, {{[0-9]+}}
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; CHECK-NO-ISEL: bc 12, 1, [[TRUE:.LBB[0-9]+]]
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; CHECK-NO-ISEL: ori 5, 3, 0
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; CHECK-NO-ISEL: b [[SUCCESSOR:.LBB[0-9]+]]
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while.end418: ; preds = %wait_on_buffer.exit1319, %do.body378
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%err.4.lcssa = phi i32 [ %inp2, %do.body378 ], [ %.err.4, %wait_on_buffer.exit1319 ]
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br i1 %inp7, label %if.end421, label %if.then420
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if.then420: ; preds = %while.end418
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call void @jbd2_journal_abort(ptr %journal, i32 signext %err.4.lcssa) #1
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br label %if.end421
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if.end421: ; preds = %if.then420, %while.end418
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unreachable
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}
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declare void @jbd2_journal_abort(ptr, i32 signext)
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declare void @__brelse(ptr)
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attributes #0 = { nounwind }
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attributes #1 = { nounwind }
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