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fba10ebb96
The ISD::STRICT_ nodes used to implement the constrained floating-point intrinsics are currently never passed to the target back-end, which makes it impossible to handle them correctly (e.g. mark instructions are depending on a floating-point status and control register, or mark instructions as possibly trapping). This patch allows the target to use setOperationAction to switch the action on ISD::STRICT_ nodes to Legal. If this is done, the SelectionDAG common code will stop converting the STRICT nodes to regular floating-point nodes, but instead pass the STRICT nodes to the target using normal SelectionDAG matching rules. To avoid having the back-end duplicate all the floating-point instruction patterns to handle both strict and non-strict variants, we make the MI codegen explicitly aware of the floating-point exceptions by introducing two new concepts: - A new MCID flag "mayRaiseFPException" that the target should set on any instruction that possibly can raise FP exception according to the architecture definition. - A new MI flag FPExcept that CodeGen/SelectionDAG will set on any MI instruction resulting from expansion of any constrained FP intrinsic. Any MI instruction that is *both* marked as mayRaiseFPException *and* FPExcept then needs to be considered as raising exceptions by MI-level codegen (e.g. scheduling). Setting those two new flags is straightforward. The mayRaiseFPException flag is simply set via TableGen by marking all relevant instruction patterns in the .td files. The FPExcept flag is set in SDNodeFlags when creating the STRICT_ nodes in the SelectionDAG, and gets inherited in the MachineSDNode nodes created from it during instruction selection. The flag is then transfered to an MIFlag when creating the MI from the MachineSDNode. This is handled just like fast-math flags like no-nans are handled today. This patch includes both common code changes required to implement the new features, and the SystemZ implementation. Reviewed By: andrew.w.kaylor Differential Revision: https://reviews.llvm.org/D55506 llvm-svn: 362663
174 lines
6.6 KiB
LLVM
174 lines
6.6 KiB
LLVM
; Test strict 32-bit floating-point division.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 \
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; RUN: | FileCheck -check-prefix=CHECK -check-prefix=CHECK-SCALAR %s
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 | FileCheck %s
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declare float @foo()
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declare float @llvm.experimental.constrained.fdiv.f32(float, float, metadata, metadata)
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; Check register division.
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define float @f1(float %f1, float %f2) {
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; CHECK-LABEL: f1:
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; CHECK: debr %f0, %f2
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; CHECK: br %r14
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%res = call float @llvm.experimental.constrained.fdiv.f32(
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float %f1, float %f2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %res
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}
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; Check the low end of the DEB range.
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define float @f2(float %f1, float *%ptr) {
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; CHECK-LABEL: f2:
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; CHECK: deb %f0, 0(%r2)
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; CHECK: br %r14
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%f2 = load float, float *%ptr
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%res = call float @llvm.experimental.constrained.fdiv.f32(
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float %f1, float %f2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %res
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}
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; Check the high end of the aligned DEB range.
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define float @f3(float %f1, float *%base) {
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; CHECK-LABEL: f3:
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; CHECK: deb %f0, 4092(%r2)
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; CHECK: br %r14
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%ptr = getelementptr float, float *%base, i64 1023
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%f2 = load float, float *%ptr
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%res = call float @llvm.experimental.constrained.fdiv.f32(
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float %f1, float %f2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %res
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}
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; Check the next word up, which needs separate address logic.
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; Other sequences besides this one would be OK.
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define float @f4(float %f1, float *%base) {
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; CHECK-LABEL: f4:
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; CHECK: aghi %r2, 4096
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; CHECK: deb %f0, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr float, float *%base, i64 1024
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%f2 = load float, float *%ptr
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%res = call float @llvm.experimental.constrained.fdiv.f32(
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float %f1, float %f2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %res
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}
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; Check negative displacements, which also need separate address logic.
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define float @f5(float %f1, float *%base) {
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; CHECK-LABEL: f5:
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; CHECK: aghi %r2, -4
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; CHECK: deb %f0, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr float, float *%base, i64 -1
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%f2 = load float, float *%ptr
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%res = call float @llvm.experimental.constrained.fdiv.f32(
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float %f1, float %f2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %res
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}
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; Check that DEB allows indices.
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define float @f6(float %f1, float *%base, i64 %index) {
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; CHECK-LABEL: f6:
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; CHECK: sllg %r1, %r3, 2
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; CHECK: deb %f0, 400(%r1,%r2)
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; CHECK: br %r14
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%ptr1 = getelementptr float, float *%base, i64 %index
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%ptr2 = getelementptr float, float *%ptr1, i64 100
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%f2 = load float, float *%ptr2
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%res = call float @llvm.experimental.constrained.fdiv.f32(
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float %f1, float %f2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %res
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}
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; Check that divisions of spilled values can use DEB rather than DEBR.
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define float @f7(float *%ptr0) {
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; CHECK-LABEL: f7:
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; CHECK: brasl %r14, foo@PLT
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; CHECK-SCALAR: deb %f0, 16{{[04]}}(%r15)
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; CHECK: br %r14
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%ptr1 = getelementptr float, float *%ptr0, i64 2
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%ptr2 = getelementptr float, float *%ptr0, i64 4
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%ptr3 = getelementptr float, float *%ptr0, i64 6
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%ptr4 = getelementptr float, float *%ptr0, i64 8
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%ptr5 = getelementptr float, float *%ptr0, i64 10
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%ptr6 = getelementptr float, float *%ptr0, i64 12
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%ptr7 = getelementptr float, float *%ptr0, i64 14
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%ptr8 = getelementptr float, float *%ptr0, i64 16
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%ptr9 = getelementptr float, float *%ptr0, i64 18
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%ptr10 = getelementptr float, float *%ptr0, i64 20
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%val0 = load float, float *%ptr0
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%val1 = load float, float *%ptr1
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%val2 = load float, float *%ptr2
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%val3 = load float, float *%ptr3
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%val4 = load float, float *%ptr4
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%val5 = load float, float *%ptr5
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%val6 = load float, float *%ptr6
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%val7 = load float, float *%ptr7
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%val8 = load float, float *%ptr8
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%val9 = load float, float *%ptr9
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%val10 = load float, float *%ptr10
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%ret = call float @foo()
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%div0 = call float @llvm.experimental.constrained.fdiv.f32(
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float %ret, float %val0,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div1 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div0, float %val1,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div2 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div1, float %val2,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div3 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div2, float %val3,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div4 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div3, float %val4,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div5 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div4, float %val5,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div6 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div5, float %val6,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div7 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div6, float %val7,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div8 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div7, float %val8,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div9 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div8, float %val9,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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%div10 = call float @llvm.experimental.constrained.fdiv.f32(
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float %div9, float %val10,
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metadata !"round.dynamic",
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metadata !"fpexcept.strict")
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ret float %div10
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}
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