hoist.ll
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; RUN: opt -gvn-hoist -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@GlobalVar = internal global float 1.000000e+00
; Check that all scalar expressions are hoisted.
;
; CHECK-LABEL: @scalarsHoisting
; CHECK: fsub
; CHECK: fmul
; CHECK: fsub
; CHECK: fmul
; CHECK-NOT: fmul
; CHECK-NOT: fsub
define float @scalarsHoisting(float %d, float %min, float %max, float %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
%sub = fsub float %min, %a
%mul = fmul float %sub, %div
%sub1 = fsub float %max, %a
%mul2 = fmul float %sub1, %div
br label %if.end
if.else: ; preds = %entry
%sub3 = fsub float %max, %a
%mul4 = fmul float %sub3, %div
%sub5 = fsub float %min, %a
%mul6 = fmul float %sub5, %div
br label %if.end
if.end: ; preds = %if.else, %if.then
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %if.then ], [ %mul4, %if.else ]
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that all loads and scalars depending on the loads are hoisted.
; Check that getelementptr computation gets hoisted before the load.
;
; CHECK-LABEL: @readsAndScalarsHoisting
; CHECK: load
; CHECK: load
; CHECK: load
; CHECK: fsub
; CHECK: fmul
; CHECK: fsub
; CHECK: fmul
; CHECK-NOT: load
; CHECK-NOT: fmul
; CHECK-NOT: fsub
define float @readsAndScalarsHoisting(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
%A = getelementptr float, float* %min, i32 1
%0 = load float, float* %A, align 4
%1 = load float, float* %a, align 4
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %if.end
if.else: ; preds = %entry
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%B = getelementptr float, float* %min, i32 1
%5 = load float, float* %B, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
br label %if.end
if.end: ; preds = %if.else, %if.then
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %if.then ], [ %mul4, %if.else ]
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that we do not hoist loads after a store: the first two loads will be
; hoisted, and then the third load will not be hoisted.
;
; CHECK-LABEL: @readsAndWrites
; CHECK: load
; CHECK: load
; CHECK: fsub
; CHECK: fmul
; CHECK: store
; CHECK: load
; CHECK: fsub
; CHECK: fmul
; CHECK: load
; CHECK: fsub
; CHECK: fmul
; CHECK-NOT: load
; CHECK-NOT: fmul
; CHECK-NOT: fsub
define float @readsAndWrites(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
store float %0, float* @GlobalVar
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %if.end
if.else: ; preds = %entry
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%5 = load float, float* %min, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
br label %if.end
if.end: ; preds = %if.else, %if.then
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %if.then ], [ %mul4, %if.else ]
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that we do hoist loads when the store is above the insertion point.
;
; CHECK-LABEL: @readsAndWriteAboveInsertPt
; CHECK: load
; CHECK: load
; CHECK: load
; CHECK: fsub
; CHECK: fmul
; CHECK: fsub
; CHECK: fmul
; CHECK-NOT: load
; CHECK-NOT: fmul
; CHECK-NOT: fsub
define float @readsAndWriteAboveInsertPt(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
store float 0.000000e+00, float* @GlobalVar
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %if.end
if.else: ; preds = %entry
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%5 = load float, float* %min, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
br label %if.end
if.end: ; preds = %if.else, %if.then
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %if.then ], [ %mul4, %if.else ]
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that dependent expressions are hoisted.
; CHECK-LABEL: @dependentScalarsHoisting
; CHECK: fsub
; CHECK: fadd
; CHECK: fdiv
; CHECK: fmul
; CHECK-NOT: fsub
; CHECK-NOT: fadd
; CHECK-NOT: fdiv
; CHECK-NOT: fmul
define float @dependentScalarsHoisting(float %a, float %b, i1 %c) {
entry:
br i1 %c, label %if.then, label %if.else
if.then:
%d = fsub float %b, %a
%e = fadd float %d, %a
%f = fdiv float %e, %a
%g = fmul float %f, %a
br label %if.end
if.else:
%h = fsub float %b, %a
%i = fadd float %h, %a
%j = fdiv float %i, %a
%k = fmul float %j, %a
br label %if.end
if.end:
%r = phi float [ %g, %if.then ], [ %k, %if.else ]
ret float %r
}
; Check that all independent expressions are hoisted.
; CHECK-LABEL: @independentScalarsHoisting
; CHECK: fsub
; CHECK: fdiv
; CHECK: fmul
; CHECK: fadd
; CHECK-NOT: fsub
; CHECK-NOT: fdiv
; CHECK-NOT: fmul
define float @independentScalarsHoisting(float %a, float %b, i1 %c) {
entry:
br i1 %c, label %if.then, label %if.else
if.then:
%d = fadd float %b, %a
%e = fsub float %b, %a
%f = fdiv float %b, %a
%g = fmul float %b, %a
br label %if.end
if.else:
%i = fadd float %b, %a
%h = fsub float %b, %a
%j = fdiv float %b, %a
%k = fmul float %b, %a
br label %if.end
if.end:
%p = phi float [ %d, %if.then ], [ %i, %if.else ]
%q = phi float [ %e, %if.then ], [ %h, %if.else ]
%r = phi float [ %f, %if.then ], [ %j, %if.else ]
%s = phi float [ %g, %if.then ], [ %k, %if.else ]
%t = fadd float %p, %q
%u = fadd float %r, %s
%v = fadd float %t, %u
ret float %v
}
; Check that we hoist load and scalar expressions in triangles.
; CHECK-LABEL: @triangleHoisting
; CHECK: load
; CHECK: load
; CHECK: load
; CHECK: fsub
; CHECK: fmul
; CHECK: fsub
; CHECK: fmul
; CHECK-NOT: load
; CHECK-NOT: fmul
; CHECK-NOT: fsub
define float @triangleHoisting(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %if.end
if.end: ; preds = %entry
%p1 = phi float [ %mul2, %if.then ], [ 0.000000e+00, %entry ]
%p2 = phi float [ %mul, %if.then ], [ 0.000000e+00, %entry ]
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%5 = load float, float* %min, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
%x = fadd float %p1, %mul6
%y = fadd float %p2, %mul4
%z = fadd float %x, %y
ret float %z
}
; Check that we do not hoist loads past stores within a same basic block.
; CHECK-LABEL: @noHoistInSingleBBWithStore
; CHECK: load
; CHECK: store
; CHECK: load
; CHECK: store
define i32 @noHoistInSingleBBWithStore() {
entry:
%D = alloca i32, align 4
%0 = bitcast i32* %D to i8*
%bf = load i8, i8* %0, align 4
%bf.clear = and i8 %bf, -3
store i8 %bf.clear, i8* %0, align 4
%bf1 = load i8, i8* %0, align 4
%bf.clear1 = and i8 %bf1, 1
store i8 %bf.clear1, i8* %0, align 4
ret i32 0
}
; Check that we do not hoist loads past calls within a same basic block.
; CHECK-LABEL: @noHoistInSingleBBWithCall
; CHECK: load
; CHECK: call
; CHECK: load
declare void @foo()
define i32 @noHoistInSingleBBWithCall() {
entry:
%D = alloca i32, align 4
%0 = bitcast i32* %D to i8*
%bf = load i8, i8* %0, align 4
%bf.clear = and i8 %bf, -3
call void @foo()
%bf1 = load i8, i8* %0, align 4
%bf.clear1 = and i8 %bf1, 1
ret i32 0
}
; Check that we do not hoist loads past stores in any branch of a diamond.
; CHECK-LABEL: @noHoistInDiamondWithOneStore1
; CHECK: fdiv
; CHECK: fcmp
; CHECK: br
define float @noHoistInDiamondWithOneStore1(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
store float 0.000000e+00, float* @GlobalVar
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %if.end
if.else: ; preds = %entry
; There are no side effects on the if.else branch.
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%5 = load float, float* %min, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
br label %if.end
if.end: ; preds = %if.else, %if.then
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %if.then ], [ %mul4, %if.else ]
%6 = load float, float* %max, align 4
%7 = load float, float* %a, align 4
%sub6 = fsub float %6, %7
%mul7 = fmul float %sub6, %div
%8 = load float, float* %min, align 4
%sub8 = fsub float %8, %7
%mul9 = fmul float %sub8, %div
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that we do not hoist loads past stores from half diamond.
; CHECK-LABEL: @noHoistInHalfDiamondPastStore
; CHECK: load
; CHECK-NEXT: load
; CHECK-NEXT: store
; CHECK-NEXT: br
; CHECK: load
; CHECK: load
; CHECK: load
; CHECK: br
define float @noHoistInHalfDiamondPastStore(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
; Loads should not be hoisted above this store.
store float 0.000000e+00, float* @GlobalVar
br i1 %cmp, label %if.then, label %if.end
if.then:
; There are no side effects on the if.then branch.
%2 = load float, float* %max, align 4
%3 = load float, float* %a, align 4
%sub3 = fsub float %2, %3
%mul4 = fmul float %sub3, %div
%4 = load float, float* %min, align 4
%sub5 = fsub float %4, %3
%mul6 = fmul float %sub5, %div
br label %if.end
if.end:
%tmax.0 = phi float [ %mul4, %if.then ], [ %0, %entry ]
%tmin.0 = phi float [ %mul6, %if.then ], [ %1, %entry ]
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that we do not hoist loads past a store in any branch of a diamond.
; CHECK-LABEL: @noHoistInDiamondWithOneStore2
; CHECK: fdiv
; CHECK: fcmp
; CHECK: br
define float @noHoistInDiamondWithOneStore2(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
; There are no side effects on the if.then branch.
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %if.end
if.else: ; preds = %entry
store float 0.000000e+00, float* @GlobalVar
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%5 = load float, float* %min, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
br label %if.end
if.end: ; preds = %if.else, %if.then
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %if.then ], [ %mul4, %if.else ]
%6 = load float, float* %max, align 4
%7 = load float, float* %a, align 4
%sub6 = fsub float %6, %7
%mul7 = fmul float %sub6, %div
%8 = load float, float* %min, align 4
%sub8 = fsub float %8, %7
%mul9 = fmul float %sub8, %div
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that we do not hoist loads outside a loop containing stores.
; CHECK-LABEL: @noHoistInLoopsWithStores
; CHECK: fdiv
; CHECK: fcmp
; CHECK: br
define float @noHoistInLoopsWithStores(float %d, float* %min, float* %max, float* %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %do.body, label %if.else
do.body:
%0 = load float, float* %min, align 4
%1 = load float, float* %a, align 4
; It is unsafe to hoist the loads outside the loop because of the store.
store float 0.000000e+00, float* @GlobalVar
%sub = fsub float %0, %1
%mul = fmul float %sub, %div
%2 = load float, float* %max, align 4
%sub1 = fsub float %2, %1
%mul2 = fmul float %sub1, %div
br label %while.cond
while.cond:
%cmp1 = fcmp oge float %mul2, 0.000000e+00
br i1 %cmp1, label %if.end, label %do.body
if.else:
%3 = load float, float* %max, align 4
%4 = load float, float* %a, align 4
%sub3 = fsub float %3, %4
%mul4 = fmul float %sub3, %div
%5 = load float, float* %min, align 4
%sub5 = fsub float %5, %4
%mul6 = fmul float %sub5, %div
br label %if.end
if.end:
%tmax.0 = phi float [ %mul2, %while.cond ], [ %mul6, %if.else ]
%tmin.0 = phi float [ %mul, %while.cond ], [ %mul4, %if.else ]
%add = fadd float %tmax.0, %tmin.0
ret float %add
}
; Check that we hoist stores: all the instructions from the then branch
; should be hoisted.
; CHECK-LABEL: @hoistStores
; CHECK: zext
; CHECK-NEXT: trunc
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: getelementptr
; CHECK-NEXT: getelementptr
; CHECK-NEXT: store
; CHECK-NEXT: load
; CHECK-NEXT: load
; CHECK-NEXT: zext
; CHECK-NEXT: add
; CHECK-NEXT: store
; CHECK-NEXT: br
; CHECK: if.then
; CHECK: br
%struct.foo = type { i16* }
define void @hoistStores(%struct.foo* %s, i32* %coord, i1 zeroext %delta) {
entry:
%frombool = zext i1 %delta to i8
%tobool = trunc i8 %frombool to i1
br i1 %tobool, label %if.then, label %if.else
if.then: ; preds = %entry
%p = getelementptr inbounds %struct.foo, %struct.foo* %s, i32 0, i32 0
%0 = load i16*, i16** %p, align 8
%incdec.ptr = getelementptr inbounds i16, i16* %0, i32 1
store i16* %incdec.ptr, i16** %p, align 8
%1 = load i16, i16* %0, align 2
%conv = zext i16 %1 to i32
%2 = load i32, i32* %coord, align 4
%add = add i32 %2, %conv
store i32 %add, i32* %coord, align 4
br label %if.end
if.else: ; preds = %entry
%p1 = getelementptr inbounds %struct.foo, %struct.foo* %s, i32 0, i32 0
%3 = load i16*, i16** %p1, align 8
%incdec.ptr2 = getelementptr inbounds i16, i16* %3, i32 1
store i16* %incdec.ptr2, i16** %p1, align 8
%4 = load i16, i16* %3, align 2
%conv3 = zext i16 %4 to i32
%5 = load i32, i32* %coord, align 4
%add4 = add i32 %5, %conv3
store i32 %add4, i32* %coord, align 4
%6 = load i16*, i16** %p1, align 8
%incdec.ptr6 = getelementptr inbounds i16, i16* %6, i32 1
store i16* %incdec.ptr6, i16** %p1, align 8
%7 = load i16, i16* %6, align 2
%conv7 = zext i16 %7 to i32
%shl = shl i32 %conv7, 8
%8 = load i32, i32* %coord, align 4
%add8 = add i32 %8, %shl
store i32 %add8, i32* %coord, align 4
br label %if.end
if.end: ; preds = %if.else, %if.then
ret void
}
define i32 @mergeAlignments(i1 %b, i32* %y) {
entry:
br i1 %b, label %if.then, label %if.end
if.then: ; preds = %entry
%l1 = load i32, i32* %y, align 4
br label %return
if.end: ; preds = %entry
%l2 = load i32, i32* %y, align 1
br label %return
return: ; preds = %if.end, %if.then
%retval.0 = phi i32 [ %l1, %if.then ], [ %l2, %if.end ]
ret i32 %retval.0
}
; CHECK-LABEL: define i32 @mergeAlignments(
; CHECK: %[[load:.*]] = load i32, i32* %y, align 1
; CHECK: %[[phi:.*]] = phi i32 [ %[[load]], %{{.*}} ], [ %[[load]], %{{.*}} ]
; CHECK: i32 %[[phi]]
declare i8 @pr30991_f() nounwind readonly
declare void @pr30991_f1(i8)
define i8 @pr30991(i8* %sp, i8* %word, i1 %b1, i1 %b2) {
entry:
br i1 %b1, label %a, label %b
a:
%r0 = load i8, i8* %word, align 1
%incdec.ptr = getelementptr i8, i8* %sp, i32 1
%rr0 = call i8 @pr30991_f() nounwind readonly
call void @pr30991_f1(i8 %r0)
ret i8 %rr0
b:
br i1 %b2, label %c, label %x
c:
%r1 = load i8, i8* %word, align 1
%incdec.ptr115 = getelementptr i8, i8* %sp, i32 1
%rr1 = call i8 @pr30991_f() nounwind readonly
call void @pr30991_f1(i8 %r1)
ret i8 %rr1
x:
%r2 = load i8, i8* %word, align 1
ret i8 %r2
}
; CHECK-LABEL: define i8 @pr30991
; CHECK: %r0 = load i8, i8* %word, align 1
; CHECK-NEXT: br i1 %b1, label %a, label %b