forked from OSchip/llvm-project
196 lines
3.5 KiB
LLVM
196 lines
3.5 KiB
LLVM
; RUN: opt < %s -S -passes=speculative-execution \
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; RUN: -spec-exec-max-speculation-cost 4 -spec-exec-max-not-hoisted 3 \
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; RUN: | FileCheck %s
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target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
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; Hoist in if-then pattern.
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define void @ifThen() {
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; CHECK-LABEL: @ifThen(
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; CHECK: %x = add i32 2, 3
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; CHECK: br i1 true
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br i1 true, label %a, label %b
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; CHECK: a:
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a:
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%x = add i32 2, 3
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; CHECK: br label
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br label %b
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; CHECK: b:
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b:
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; CHECK: ret void
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ret void
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}
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; Hoist in if-else pattern.
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define void @ifElse() {
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; CHECK-LABEL: @ifElse(
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; CHECK: %x = add i32 2, 3
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; CHECK: br i1 true
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br i1 true, label %b, label %a
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; CHECK: a:
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a:
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%x = add i32 2, 3
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; CHECK: br label
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br label %b
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; CHECK: b:
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b:
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; CHECK: ret void
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ret void
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}
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; Hoist in if-then-else pattern if it is equivalent to if-then.
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define void @ifElseThenAsIfThen() {
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; CHECK-LABEL: @ifElseThenAsIfThen(
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; CHECK: %x = add i32 2, 3
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; CHECK: br
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br i1 true, label %a, label %b
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; CHECK: a:
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a:
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%x = add i32 2, 3
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; CHECK: br label
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br label %c
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; CHECK: b:
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b:
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br label %c
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; CHECK: c
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c:
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ret void
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}
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; Hoist in if-then-else pattern if it is equivalent to if-else.
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define void @ifElseThenAsIfElse() {
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; CHECK-LABEL: @ifElseThenAsIfElse(
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; CHECK: %x = add i32 2, 3
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; CHECK: br
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br i1 true, label %b, label %a
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; CHECK: a:
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a:
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%x = add i32 2, 3
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; CHECK: br label
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br label %c
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; CHECK: b:
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b:
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br label %c
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; CHECK: c
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c:
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ret void
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}
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; Do not hoist if-then-else pattern if it is not equivalent to if-then
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; or if-else.
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define void @ifElseThen() {
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; CHECK-LABEL: @ifElseThen(
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; CHECK: br
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br i1 true, label %a, label %b
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; CHECK: a:
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a:
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; CHECK: %x = add
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%x = add i32 2, 3
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; CHECK: br label
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br label %c
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; CHECK: b:
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b:
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; CHECK: %y = add
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%y = add i32 2, 3
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br label %c
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; CHECK: c
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c:
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ret void
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}
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; Do not hoist loads and do not hoist an instruction past a definition of
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; an operand.
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define void @doNotHoistPastDef() {
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; CHECK-LABEL: @doNotHoistPastDef(
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br i1 true, label %b, label %a
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; CHECK-NOT: load
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; CHECK-NOT: add
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; CHECK: a:
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a:
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; CHECK: %def = load
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%def = load i32, i32* null
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; CHECK: %use = add
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%use = add i32 %def, 0
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br label %b
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; CHECK: b:
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b:
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ret void
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}
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; Case with nothing to speculate.
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define void @nothingToSpeculate() {
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; CHECK-LABEL: @nothingToSpeculate(
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br i1 true, label %b, label %a
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; CHECK: a:
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a:
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; CHECK: %def = load
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%def = load i32, i32* null
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br label %b
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; CHECK: b:
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b:
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ret void
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}
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; Still hoist if an operand is defined before the block or is itself hoisted.
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define void @hoistIfNotPastDef() {
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; CHECK-LABEL: @hoistIfNotPastDef(
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; CHECK: %x = load
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%x = load i32, i32* null
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; CHECK: %y = add i32 %x, 1
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; CHECK: %z = add i32 %y, 1
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; CHECK: br
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br i1 true, label %b, label %a
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; CHECK: a:
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a:
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%y = add i32 %x, 1
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%z = add i32 %y, 1
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br label %b
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; CHECK: b:
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b:
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ret void
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}
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; Do not hoist if the speculation cost is too high.
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define void @costTooHigh() {
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; CHECK-LABEL: @costTooHigh(
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; CHECK: br
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br i1 true, label %b, label %a
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; CHECK: a:
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a:
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; CHECK: %r1 = add
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%r1 = add i32 1, 1
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; CHECK: %r2 = add
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%r2 = add i32 1, 1
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; CHECK: %r3 = add
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%r3 = add i32 1, 1
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; CHECK: %r4 = add
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%r4 = add i32 1, 1
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; CHECK: %r5 = add
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%r5 = add i32 1, 1
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br label %b
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; CHECK: b:
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b:
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ret void
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}
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; Do not hoist if too many instructions are left behind.
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define void @tooMuchLeftBehind() {
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; CHECK-LABEL: @tooMuchLeftBehind(
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; CHECK: br
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br i1 true, label %b, label %a
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; CHECK: a:
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a:
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; CHECK: %x = load
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%x = load i32, i32* null
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; CHECK: %r1 = add
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%r1 = add i32 %x, 1
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; CHECK: %r2 = add
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%r2 = add i32 %x, 1
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; CHECK: %r3 = add
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%r3 = add i32 %x, 1
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br label %b
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; CHECK: b:
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b:
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ret void
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}
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