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https://github.com/c64scene-ar/llvm-6502.git
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c59ca90970
Shrink-wrapping can now be tested on ARM with -enable-shrink-wrap. Related to <rdar://problem/20821730> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242908 91177308-0d34-0410-b5e6-96231b3b80d8
537 lines
16 KiB
LLVM
537 lines
16 KiB
LLVM
; RUN: llc %s -o - -enable-shrink-wrap=true -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=armv7-apple-ios \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=ARM --check-prefix=ENABLE --check-prefix=ARM-ENABLE
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; RUN: llc %s -o - -enable-shrink-wrap=false -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=armv7-apple-ios \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=ARM --check-prefix=DISABLE --check-prefix=ARM-DISABLE
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; RUN: llc %s -o - -enable-shrink-wrap=true -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=thumbv7-apple-ios \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=THUMB --check-prefix=ENABLE --check-prefix=THUMB-ENABLE
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; RUN: llc %s -o - -enable-shrink-wrap=false -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=thumbv7-apple-ios \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=THUMB --check-prefix=DISABLE --check-prefix=THUMB-DISABLE
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;
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; Note: Lots of tests use inline asm instead of regular calls.
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; This allows to have a better control on what the allocation will do.
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; Otherwise, we may have spill right in the entry block, defeating
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; shrink-wrapping. Moreover, some of the inline asm statements (nop)
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; are here to ensure that the related paths do not end up as critical
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; edges.
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; Also disable the late if-converter as it makes harder to reason on
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; the diffs.
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; Initial motivating example: Simple diamond with a call just on one side.
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; CHECK-LABEL: foo:
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;
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; Compare the arguments and jump to exit.
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; No prologue needed.
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; ENABLE: cmp r0, r1
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; ENABLE-NEXT: bge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; CHECK: push {r7, lr}
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; CHECK-NEXT: mov r7, sp
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;;
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; Compare the arguments and jump to exit.
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; After the prologue is set.
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; DISABLE: sub sp
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; DISABLE: cmp r0, r1
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; DISABLE-NEXT: bge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Store %a in the alloca.
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; ARM-ENABLE: push {r0}
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; THUMB-ENABLE: str r0, [sp, #-4]
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; DISABLE: str r0, [sp]
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; Set the alloca address in the second argument.
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; CHECK-NEXT: mov r1, sp
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; Set the first argument to zero.
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; CHECK-NEXT: mov{{s?}} r0, #0
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; CHECK-NEXT: bl{{x?}} _doSomething
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;
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; With shrink-wrapping, epilogue is just after the call.
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; ARM-ENABLE-NEXT: mov sp, r7
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; THUMB-ENABLE-NEXT: add sp, #4
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; ENABLE-NEXT: pop{{(\.w)?}} {r7, lr}
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;
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; CHECK: [[EXIT_LABEL]]:
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;
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; Without shrink-wrapping, epilogue is in the exit block.
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; Epilogue code. (What we pop does not matter.)
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; ARM-DISABLE: mov sp, r7
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; THUMB-DISABLE: add sp,
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; DISABLE-NEXT: pop {r7, pc}
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;
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; ENABLE-NEXT: bx lr
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define i32 @foo(i32 %a, i32 %b) {
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
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ret i32 %tmp.0
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}
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; Function Attrs: optsize
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declare i32 @doSomething(i32, i32*)
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; Check that we do not perform the restore inside the loop whereas the save
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; is outside.
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; CHECK-LABEL: freqSaveAndRestoreOutsideLoop:
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;
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; Shrink-wrapping allows to skip the prologue in the else case.
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; ARM-ENABLE: cmp r0, #0
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; ARM-ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-ENABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, r7, lr}
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; CHECK-NEXT: add r7, sp, #4
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;
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; ARM-DISABLE: cmp r0, #0
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; ARM-DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-DISABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; SUM is in r0 because it is coalesced with the second
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; argument on the else path.
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; CHECK: mov{{s?}} [[SUM:r0]], #0
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; CHECK-NEXT: mov{{s?}} [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; CHECK: mov{{(\.w)?}} [[TMP:r[0-9]+]], #1
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; ARM: subs [[IV]], [[IV]], #1
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; THUMB: subs [[IV]], #1
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; ARM-NEXT: add [[SUM]], [[TMP]], [[SUM]]
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; THUMB-NEXT: add [[SUM]], [[TMP]]
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; CHECK-NEXT: bne [[LOOP]]
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;
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; Next BB.
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; SUM << 3.
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; CHECK: lsl{{s?}} [[SUM]], [[SUM]], #3
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; ENABLE-NEXT: pop {r4, r7, pc}
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;
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; Duplicated epilogue.
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; DISABLE: pop {r4, r7, pc}
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsl{{s?}} r0, r1, #1
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; DISABLE-NEXT: pop {r4, r7, pc}
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;
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; ENABLE-NEXT: bx lr
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define i32 @freqSaveAndRestoreOutsideLoop(i32 %cond, i32 %N) {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %for.preheader
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for.preheader:
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tail call void asm "nop", ""()
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
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%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
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%call = tail call i32 asm sideeffect "mov $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.04
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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%shl = shl i32 %add, 3
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br label %if.end
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if.else: ; preds = %entry
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%mul = shl nsw i32 %N, 1
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br label %if.end
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if.end: ; preds = %if.else, %for.end
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%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
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ret i32 %sum.1
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}
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declare i32 @something(...)
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; Check that we do not perform the shrink-wrapping inside the loop even
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; though that would be legal. The cost model must prevent that.
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; CHECK-LABEL: freqSaveAndRestoreOutsideLoop2:
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4
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; CHECK: mov{{s?}} [[SUM:r0]], #0
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; CHECK-NEXT: mov{{s?}} [[IV:r[0-9]+]], #10
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; CHECK: nop
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; Next BB.
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; CHECK: [[LOOP_LABEL:LBB[0-9_]+]]: @ %for.body
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; CHECK: mov{{(\.w)?}} [[TMP:r[0-9]+]], #1
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; ARM: subs [[IV]], [[IV]], #1
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; THUMB: subs [[IV]], #1
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; ARM: add [[SUM]], [[TMP]], [[SUM]]
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; THUMB: add [[SUM]], [[TMP]]
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; CHECK-NEXT: bne [[LOOP_LABEL]]
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; Next BB.
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; CHECK: @ %for.exit
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; CHECK: nop
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; CHECK: pop {r4
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define i32 @freqSaveAndRestoreOutsideLoop2(i32 %cond) {
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entry:
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br label %for.preheader
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for.preheader:
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tail call void asm "nop", ""()
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.04 = phi i32 [ 0, %for.preheader ], [ %inc, %for.body ]
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%sum.03 = phi i32 [ 0, %for.preheader ], [ %add, %for.body ]
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%call = tail call i32 asm sideeffect "mov $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.03
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%inc = add nuw nsw i32 %i.04, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.exit, label %for.body
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for.exit:
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tail call void asm "nop", ""()
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br label %for.end
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for.end: ; preds = %for.body
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ret i32 %add
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}
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; Check with a more complex case that we do not have save within the loop and
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; restore outside.
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; CHECK-LABEL: loopInfoSaveOutsideLoop:
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;
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; ARM-ENABLE: cmp r0, #0
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; ARM-ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-ENABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, r7, lr}
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; CHECK-NEXT: add r7, sp, #4
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;
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; ARM-DISABLE: cmp r0, #0
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; ARM-DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-DISABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; SUM is in r0 because it is coalesced with the second
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; argument on the else path.
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; CHECK: mov{{s?}} [[SUM:r0]], #0
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; CHECK-NEXT: mov{{s?}} [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; CHECK: mov{{(\.w)?}} [[TMP:r[0-9]+]], #1
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; ARM: subs [[IV]], [[IV]], #1
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; THUMB: subs [[IV]], #1
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; ARM-NEXT: add [[SUM]], [[TMP]], [[SUM]]
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; THUMB-NEXT: add [[SUM]], [[TMP]]
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; CHECK-NEXT: bne [[LOOP]]
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;
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; Next BB.
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; SUM << 3.
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; CHECK: lsl{{s?}} [[SUM]], [[SUM]], #3
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; ENABLE: pop {r4, r7, pc}
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;
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; Duplicated epilogue.
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; DISABLE: pop {r4, r7, pc}
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsl{{s?}} r0, r1, #1
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; DISABLE-NEXT: pop {r4, r7, pc}
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;
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; ENABLE-NEXT: bx lr
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define i32 @loopInfoSaveOutsideLoop(i32 %cond, i32 %N) {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %for.preheader
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for.preheader:
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tail call void asm "nop", ""()
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
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%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
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%call = tail call i32 asm sideeffect "mov $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.04
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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tail call void asm "nop", "~{r4}"()
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%shl = shl i32 %add, 3
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br label %if.end
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if.else: ; preds = %entry
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%mul = shl nsw i32 %N, 1
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br label %if.end
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if.end: ; preds = %if.else, %for.end
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%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
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ret i32 %sum.1
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}
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declare void @somethingElse(...)
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; Check with a more complex case that we do not have restore within the loop and
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; save outside.
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; CHECK-LABEL: loopInfoRestoreOutsideLoop:
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;
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; ARM-ENABLE: cmp r0, #0
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; ARM-ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-ENABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, r7, lr}
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; CHECK-NEXT: add r7, sp, #4
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;
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; ARM-DISABLE: cmp r0, #0
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; ARM-DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-DISABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; SUM is in r0 because it is coalesced with the second
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; argument on the else path.
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; CHECK: mov{{s?}} [[SUM:r0]], #0
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; CHECK-NEXT: mov{{s?}} [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; CHECK: mov{{(\.w)?}} [[TMP:r[0-9]+]], #1
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; ARM: subs [[IV]], [[IV]], #1
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; THUMB: subs [[IV]], #1
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; ARM-NEXT: add [[SUM]], [[TMP]], [[SUM]]
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; THUMB-NEXT: add [[SUM]], [[TMP]]
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; CHECK-NEXT: bne [[LOOP]]
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;
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; Next BB.
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; SUM << 3.
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; CHECK: lsl{{s?}} [[SUM]], [[SUM]], #3
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; ENABLE-NEXT: pop {r4, r7, pc}
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;
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; Duplicated epilogue.
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; DISABLE: pop {r4, r7, pc}
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsl{{s?}} r0, r1, #1
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; DISABLE-NEXT: pop {r4, r7, pc}
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;
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; ENABLE-NEXT: bx lr
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define i32 @loopInfoRestoreOutsideLoop(i32 %cond, i32 %N) #0 {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %if.then
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if.then: ; preds = %entry
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tail call void asm "nop", "~{r4}"()
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br label %for.body
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for.body: ; preds = %for.body, %if.then
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%i.05 = phi i32 [ 0, %if.then ], [ %inc, %for.body ]
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%sum.04 = phi i32 [ 0, %if.then ], [ %add, %for.body ]
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%call = tail call i32 asm sideeffect "mov $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.04
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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%shl = shl i32 %add, 3
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br label %if.end
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if.else: ; preds = %entry
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%mul = shl nsw i32 %N, 1
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br label %if.end
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if.end: ; preds = %if.else, %for.end
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%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
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ret i32 %sum.1
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}
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; Check that we handle function with no frame information correctly.
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; CHECK-LABEL: emptyFrame:
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; CHECK: @ %entry
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; CHECK-NEXT: mov{{s?}} r0, #0
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; CHECK-NEXT: bx lr
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define i32 @emptyFrame() {
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entry:
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ret i32 0
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}
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; Check that we handle inline asm correctly.
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; CHECK-LABEL: inlineAsm:
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;
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; ARM-ENABLE: cmp r0, #0
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; ARM-ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-ENABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, r7, lr}
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; CHECK-NEXT: add r7, sp, #4
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;
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; ARM-DISABLE: cmp r0, #0
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; ARM-DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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; THUMB-DISABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; CHECK: mov{{s?}} [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; ARM: subs [[IV]], [[IV]], #1
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; THUMB: subs [[IV]], #1
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; CHECK: add{{(\.w)?}} r4, r4, #1
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; CHECK: bne [[LOOP]]
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;
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; Next BB.
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; CHECK: mov{{s?}} r0, #0
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;
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; Duplicated epilogue.
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; DISABLE: pop {r4, r7, pc}
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsl{{s?}} r0, r1, #1
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; DISABLE-NEXT: pop {r4, r7, pc}
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;
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; ENABLE-NEXT: bx lr
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define i32 @inlineAsm(i32 %cond, i32 %N) {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %for.preheader
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|
for.preheader:
|
|
tail call void asm "nop", ""()
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %entry, %for.body
|
|
%i.03 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
|
|
tail call void asm sideeffect "add r4, #1", "~{r4}"()
|
|
%inc = add nuw nsw i32 %i.03, 1
|
|
%exitcond = icmp eq i32 %inc, 10
|
|
br i1 %exitcond, label %for.exit, label %for.body
|
|
|
|
for.exit:
|
|
tail call void asm "nop", ""()
|
|
br label %if.end
|
|
|
|
if.else: ; preds = %entry
|
|
%mul = shl nsw i32 %N, 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %for.body, %if.else
|
|
%sum.0 = phi i32 [ %mul, %if.else ], [ 0, %for.exit ]
|
|
ret i32 %sum.0
|
|
}
|
|
|
|
; Check that we handle calls to variadic functions correctly.
|
|
; CHECK-LABEL: callVariadicFunc:
|
|
;
|
|
; ARM-ENABLE: cmp r0, #0
|
|
; ARM-ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
|
|
; THUMB-ENABLE: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; Prologue code.
|
|
; CHECK: push {r7, lr}
|
|
; CHECK-NEXT: mov r7, sp
|
|
; CHECK-NEXT: sub sp, {{(sp, )?}}#12
|
|
;
|
|
; ARM-DISABLE: cmp r0, #0
|
|
; ARM-DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
|
|
; THUMB-DISABLE-NEXT: cbz r0, [[ELSE_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; Setup of the varags.
|
|
; CHECK: mov r0, r1
|
|
; CHECK-NEXT: mov r2, r1
|
|
; CHECK-NEXT: mov r3, r1
|
|
; ARM-NEXT: str r1, [sp]
|
|
; ARM-NEXT: str r1, [sp, #4]
|
|
; THUMB-NEXT: strd r1, r1, [sp]
|
|
; CHECK-NEXT: str r1, [sp, #8]
|
|
; CHECK-NEXT: bl{{x?}} _someVariadicFunc
|
|
; CHECK-NEXT: lsl{{s?}} r0, r0, #3
|
|
; ARM-NEXT: mov sp, r7
|
|
; THUMB-NEXT: add sp, #12
|
|
; CHECK-NEXT: pop {r7, pc}
|
|
;
|
|
; CHECK: [[ELSE_LABEL]]: @ %if.else
|
|
; Shift second argument by one and store into returned register.
|
|
; CHECK: lsl{{s?}} r0, r1, #1
|
|
;
|
|
; Epilogue code.
|
|
; ENABLE-NEXT: bx lr
|
|
;
|
|
; ARM-DISABLE-NEXT: mov sp, r7
|
|
; THUMB-DISABLE-NEXT: add sp, #12
|
|
; DISABLE-NEXT: pop {r7, pc}
|
|
define i32 @callVariadicFunc(i32 %cond, i32 %N) {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %if.else, label %if.then
|
|
|
|
if.then: ; preds = %entry
|
|
%call = tail call i32 (i32, ...) @someVariadicFunc(i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N)
|
|
%shl = shl i32 %call, 3
|
|
br label %if.end
|
|
|
|
if.else: ; preds = %entry
|
|
%mul = shl nsw i32 %N, 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %if.else, %if.then
|
|
%sum.0 = phi i32 [ %shl, %if.then ], [ %mul, %if.else ]
|
|
ret i32 %sum.0
|
|
}
|
|
|
|
declare i32 @someVariadicFunc(i32, ...)
|
|
|
|
; Make sure we do not insert unreachable code after noreturn function.
|
|
; Although this is not incorrect to insert such code, it is useless
|
|
; and it hurts the binary size.
|
|
;
|
|
; CHECK-LABEL: noreturn:
|
|
; DISABLE: push
|
|
;
|
|
; CHECK: tst{{(\.w)?}} r0, #255
|
|
; CHECK-NEXT: bne [[ABORT:LBB[0-9_]+]]
|
|
;
|
|
; CHECK: mov{{s?}} r0, #42
|
|
;
|
|
; ENABLE-NEXT: bx lr
|
|
;
|
|
; DISABLE-NEXT: pop
|
|
;;
|
|
; CHECK: [[ABORT]]: @ %if.abort
|
|
;
|
|
; ENABLE: push
|
|
;
|
|
; CHECK: bl{{x?}} _abort
|
|
; ENABLE-NOT: pop
|
|
define i32 @noreturn(i8 signext %bad_thing) {
|
|
entry:
|
|
%tobool = icmp eq i8 %bad_thing, 0
|
|
br i1 %tobool, label %if.end, label %if.abort
|
|
|
|
if.abort:
|
|
%call = tail call i32 asm sideeffect "mov $0, #1", "=r,~{r4}"()
|
|
tail call void @abort() #0
|
|
unreachable
|
|
|
|
if.end:
|
|
ret i32 42
|
|
}
|
|
|
|
declare void @abort() #0
|
|
|
|
attributes #0 = { noreturn nounwind }
|