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abb4b9d9ee
The tail duplication pass uses an assumed layout when making duplication decisions. This is fine, but passes up duplication opportunities that may arise when blocks are outlined. Because we want the updated CFG to affect subsequent placement decisions, this change must occur during placement. In order to achieve this goal, TailDuplicationPass is split into a utility class, TailDuplicator, and the pass itself. The pass delegates nearly everything to the TailDuplicator object, except for looping over the blocks in a function. This allows the same code to be used for tail duplication in both places. This change, in concert with outlining optional branches, allows triangle shaped code to perform much better, esepecially when the taken/untaken branches are correlated, as it creates a second spine when the tests are small enough. Issue from previous rollback fixed, and a new test was added for that case as well. Issue was worklist/scheduling/taildup issue in layout. Issue from 2nd rollback fixed, with 2 additional tests. Issue was tail merging/loop info/tail-duplication causing issue with loops that share a header block. Issue with early tail-duplication of blocks that branch to a fallthrough predecessor fixed with test case: tail-dup-branch-to-fallthrough.ll Differential revision: https://reviews.llvm.org/D18226 llvm-svn: 283934
161 lines
5.0 KiB
LLVM
161 lines
5.0 KiB
LLVM
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 | FileCheck %s
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; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 | FileCheck -check-prefix=CHECK-NOAV %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.__jmp_buf_tag = type { [64 x i64], i32, %struct.__sigset_t, [8 x i8] }
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%struct.__sigset_t = type { [16 x i64] }
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@env_sigill = internal global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16
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define void @foo() #0 {
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entry:
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call void @llvm.eh.sjlj.longjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8*))
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unreachable
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; CHECK: @foo
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; CHECK: addis [[REG:[0-9]+]], 2, env_sigill@toc@ha
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; CHECK: addi [[REG]], [[REG]], env_sigill@toc@l
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; CHECK: ld 31, 0([[REG]])
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; CHECK: ld [[REG2:[0-9]+]], 8([[REG]])
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; CHECK-DAG: ld 1, 16([[REG]])
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; CHECK-DAG: mtctr [[REG2]]
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; CHECK-DAG: ld 30, 32([[REG]])
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; CHECK-DAG: ld 2, 24([[REG]])
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; CHECK: bctr
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return: ; No predecessors!
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ret void
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}
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declare void @llvm.eh.sjlj.longjmp(i8*) #1
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define signext i32 @main() #0 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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%0 = call i8* @llvm.frameaddress(i32 0)
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store i8* %0, i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**)
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%1 = call i8* @llvm.stacksave()
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store i8* %1, i8** getelementptr (i8*, i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**), i32 2)
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%2 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8*))
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%tobool = icmp ne i32 %2, 0
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br i1 %tobool, label %if.then, label %if.else
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if.then: ; preds = %entry
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store i32 1, i32* %retval
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br label %return
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if.else: ; preds = %entry
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call void @foo()
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br label %if.end
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if.end: ; preds = %if.else
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store i32 0, i32* %retval
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br label %return
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return: ; preds = %if.end, %if.then
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%3 = load i32, i32* %retval
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ret i32 %3
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; FIXME: We should be saving VRSAVE on Darwin, but we're not!
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; CHECK: @main
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; CHECK: std
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; Make sure that we're not saving VRSAVE on non-Darwin:
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; CHECK-NOT: mfspr
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; CHECK-DAG: stfd
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; CHECK-DAG: stxvd2x
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; CHECK-DAG: addis [[REG:[0-9]+]], 2, env_sigill@toc@ha
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; CHECK-DAG: std 31, env_sigill@toc@l([[REG]])
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; CHECK-DAG: addi [[REGA:[0-9]+]], [[REG]], env_sigill@toc@l
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; CHECK-DAG: std [[REGA]], [[OFF:[0-9]+]](31) # 8-byte Folded Spill
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; CHECK-DAG: std 1, 16([[REGA]])
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; CHECK-DAG: std 2, 24([[REGA]])
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; CHECK: bcl 20, 31, .LBB1_3
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; CHECK: li 3, 1
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; CHECK: #EH_SjLj_Setup .LBB1_3
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; CHECK: b .LBB1_1
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; CHECK: .LBB1_3:
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; CHECK: mflr [[REGL:[0-9]+]]
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; CHECK: ld [[REG2:[0-9]+]], [[OFF]](31) # 8-byte Folded Reload
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; CHECK: std [[REGL]], 8([[REG2]])
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; CHECK: li 3, 0
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; CHECK: .LBB1_5:
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; CHECK: lfd
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; CHECK: lxvd2x
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; CHECK: ld
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; CHECK: blr
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; CHECK-NOAV: @main
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; CHECK-NOAV-NOT: stxvd2x
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; CHECK-NOAV: bcl
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; CHECK-NOAV: mflr
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; CHECK-NOAV: bl foo
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; CHECK-NOAV-NOT: lxvd2x
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; CHECK-NOAV: blr
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}
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define signext i32 @main2() #0 {
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entry:
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%a = alloca i8, align 64
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call void @bar(i8* %a)
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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%0 = call i8* @llvm.frameaddress(i32 0)
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store i8* %0, i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**)
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%1 = call i8* @llvm.stacksave()
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store i8* %1, i8** getelementptr (i8*, i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**), i32 2)
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%2 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8*))
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%tobool = icmp ne i32 %2, 0
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br i1 %tobool, label %if.then, label %if.else
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if.then: ; preds = %entry
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store i32 1, i32* %retval
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br label %return
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if.else: ; preds = %entry
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call void @foo()
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br label %if.end
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if.end: ; preds = %if.else
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store i32 0, i32* %retval
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br label %return
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return: ; preds = %if.end, %if.then
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%3 = load i32, i32* %retval
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ret i32 %3
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; CHECK: @main2
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; CHECK: addis [[REG:[0-9]+]], 2, env_sigill@toc@ha
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; CHECK-DAG: std 31, env_sigill@toc@l([[REG]])
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; CHECK-DAG: addi [[REGB:[0-9]+]], [[REG]], env_sigill@toc@l
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; CHECK-DAG: std [[REGB]], [[OFF:[0-9]+]](31) # 8-byte Folded Spill
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; CHECK-DAG: std 1, 16([[REGB]])
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; CHECK-DAG: std 2, 24([[REGB]])
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; CHECK-DAG: std 30, 32([[REGB]])
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; CHECK: bcl 20, 31,
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; CHECK: blr
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}
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declare void @bar(i8*) #3
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declare i8* @llvm.frameaddress(i32) #2
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declare i8* @llvm.stacksave() #3
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declare i32 @llvm.eh.sjlj.setjmp(i8*) #3
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { noreturn nounwind }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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