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b4cf0df8b1
MachineRegisterInfo used to allow just one regalloc hint per virtual register. This patch extends this to a vector of regalloc hints, which is filled in by common code with sorted copy hints. Such hints will make for more ID copies that can be removed. NB! This improvement is currently (and hopefully temporarily) *disabled* by default, except for SystemZ. The only reason for this is the big impact this has on tests, which has unfortunately proven unmanageable. It was a long while since all the tests were updated and just waiting for review (which didn't happen), but now targets have to enable this themselves instead. Several targets could get a head-start by downloading the tests updates from the Phabricator review. Thanks to those who helped, and sorry you now have to do this step yourselves. This should be an improvement generally for any target! The target may still create its own hint, in which case this has highest priority and is stored first in the vector. If it has target-type, it will not be recomputed, as per the previous behaviour. The temporary hook enableMultipleCopyHints() will be removed as soon as all targets return true. Review: Quentin Colombet, Ulrich Weigand. https://reviews.llvm.org/D38128 llvm-svn: 319754
126 lines
3.4 KiB
LLVM
126 lines
3.4 KiB
LLVM
; Test sibling calls.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare void @ok(i8 %r2, i16 %r3, i32 %r4, i64 %r5, float %f0, double %f2,
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float %f4, double %f6)
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declare void @uses_r6(i8 %r2, i16 %r3, i32 %r4, i64 %r5, i64 %r6)
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declare void @uses_indirect(fp128 %r2)
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declare void @uses_stack(float %f0, float %f2, float %f4, float %f6,
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float %stack)
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declare i32 @returns_i32()
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declare i64 @returns_i64()
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; Check the maximum number of arguments that we can pass and still use
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; a sibling call.
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define void @f1() {
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; CHECK-LABEL: f1:
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; CHECK-DAG: lzer %f0
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; CHECK-DAG: lzdr %f2
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; CHECK-DAG: lhi %r2, 1
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; CHECK-DAG: lhi %r3, 2
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; CHECK-DAG: lhi %r4, 3
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; CHECK-DAG: lghi %r5, 4
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; CHECK-DAG: {{ler %f4, %f0|lzer %f4}}
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; CHECK-DAG: {{ldr %f6, %f2|lzdr %f6}}
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; CHECK: jg ok@PLT
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tail call void @ok(i8 1, i16 2, i32 3, i64 4, float 0.0, double 0.0,
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float 0.0, double 0.0)
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ret void
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}
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; Check a call that uses %r6 to pass an argument. At the moment we don't
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; use sibling calls in that case.
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define void @f2() {
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; CHECK-LABEL: f2:
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; CHECK: brasl %r14, uses_r6@PLT
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; CHECK: br %r14
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tail call void @uses_r6(i8 1, i16 2, i32 3, i64 4, i64 5)
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ret void
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}
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; Check a call that passes indirect arguments. We can't use sibling
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; calls in that case.
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define void @f3() {
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; CHECK-LABEL: f3:
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; CHECK: brasl %r14, uses_indirect@PLT
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; CHECK: br %r14
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tail call void @uses_indirect(fp128 0xL00000000000000000000000000000000)
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ret void
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}
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; Check a call that uses direct stack arguments, which again prevents
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; sibling calls
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define void @f4() {
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; CHECK-LABEL: f4:
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; CHECK: brasl %r14, uses_stack@PLT
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; CHECK: br %r14
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tail call void @uses_stack(float 0.0, float 0.0, float 0.0, float 0.0,
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float 0.0)
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ret void
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}
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; Check an indirect call. In this case the only acceptable choice for
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; the target register is %r1.
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define void @f5(void(i32, i32, i32, i32) *%foo) {
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; CHECK-LABEL: f5:
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; CHECK: lgr %r1, %r2
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; CHECK-DAG: lhi %r2, 1
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; CHECK-DAG: lhi %r3, 2
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; CHECK-DAG: lhi %r4, 3
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; CHECK-DAG: lhi %r5, 4
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; CHECK: br %r1
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tail call void %foo(i32 1, i32 2, i32 3, i32 4)
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ret void
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}
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; Check an indirect call that will be forced into a call-saved GPR
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; (which should be %r13, the highest GPR not used for anything else).
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define void @f6(void(i32) *%foo) {
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; CHECK-LABEL: f6:
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; CHECK: stmg %r13, %r15, 104(%r15)
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; CHECK: lgr %r13, %r2
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; CHECK: brasl %r14, returns_i32
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; CHECK: lgr %r1, %r13
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; CHECK: lmg %r13, %r15, 264(%r15)
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; CHECK: br %r1
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%arg = call i32 @returns_i32()
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tail call void %foo(i32 %arg)
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ret void
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}
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; Test a function that returns a value.
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define i64 @f7() {
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; CHECK-LABEL: f7:
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; CHECK: jg returns_i64@PLT
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%res = tail call i64 @returns_i64()
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ret i64 %res
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}
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; Test a function that returns a value truncated from i64 to i32.
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define i32 @f8() {
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; CHECK-LABEL: f8:
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; CHECK: jg returns_i64@PLT
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%res = tail call i64 @returns_i64()
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%trunc = trunc i64 %res to i32
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ret i32 %trunc
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}
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; Test a function that returns a value truncated from i64 to i7.
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define i7 @f9() {
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; CHECK-LABEL: f9:
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; CHECK: jg returns_i64@PLT
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%res = tail call i64 @returns_i64()
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%trunc = trunc i64 %res to i7
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ret i7 %trunc
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}
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; Test a function that returns a value truncated from i32 to i8.
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define i8 @f10() {
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; CHECK-LABEL: f10:
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; CHECK: jg returns_i32@PLT
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%res = tail call i32 @returns_i32()
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%trunc = trunc i32 %res to i8
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ret i8 %trunc
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}
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