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Sam Elliott fe4245a4c1 [RISCV] Implement convertSelectOfConstantsToMath 
Summary:
The current lowering of `select` on RISC-V uses a branch instruction to load a
register with one or other value. This is inefficient, especially in the case of
small constants that can be computed easily.

By implementing the TargetLowering::convertSelectOfConstantsToMath hook, some of
the simpler cases are covered that let us avoid introducing a branch in these
cases.

Reviewed By: luismarques

Differential Revision: https://reviews.llvm.org/D79260
2020-05-02 15:05:57 +01:00
..
GlobalISel
[RISCV GlobalISel] Adding initial GlobalISel infrastructure
2019-08-20 22:53:24 +00:00
intrinsics
[RISCV] Lower llvm.trap and llvm.debugtrap
2019-10-28 09:54:33 +00:00
add-before-shl.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
addc-adde-sube-subc.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
addcarry.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
align.ll
…
alloca.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
alu8.ll
…
alu16.ll
…
alu32.ll
[RISCV] Custom legalize i32 operations for RV64 to reduce signed extensions
2019-08-06 00:24:00 +00:00
alu64.ll
Reland [MachineCopyPropagation] Extend MCP to do trivial copy backward propagation.
2019-12-05 14:32:11 +08:00
analyze-branch.ll
…
arith-with-overflow.ll
[TargetLowering] Simplify expansion of S{ADD,SUB}O
2019-09-30 07:58:50 +00:00
atomic-cmpxchg-flag.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
atomic-cmpxchg.ll
[LegalizeTypes][RISCV] Correctly sign-extend comparison for ATOMIC_CMP_XCHG
2020-04-01 15:51:26 +01:00
atomic-fence.ll
…
atomic-load-store.ll
…
atomic-rmw.ll
[MBP] Avoid tail duplication if it can't bring benefit
2019-12-06 09:53:53 -08:00
attributes.ll
[RISCV] ELF attribute section for RISC-V.
2020-03-31 16:16:19 +08:00
bare-select.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
blockaddress.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
branch-relaxation.ll
…
branch.ll
…
bswap-ctlz-cttz-ctpop.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
byval.ll
…
callee-saved-fpr32s.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
callee-saved-fpr64s.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
callee-saved-gprs.ll
[RISCV] Remove RA from reserved register to use as callee saved register
2019-10-29 11:32:16 +08:00
calling-conv-ilp32-ilp32f-common.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-ilp32-ilp32f-ilp32d-common.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-ilp32.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-ilp32d.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-ilp32f-ilp32d-common.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-lp64-lp64f-common.ll
…
calling-conv-lp64-lp64f-lp64d-common.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-lp64.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-rv32f-ilp32.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
calling-conv-sext-zext.ll
…
calls.ll
…
codemodel-lowering.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
compress-float.ll
[test] llvm/test/: change llvm-objdump single-dash long options to double-dash options
2020-03-15 17:46:23 -07:00
compress-inline-asm.ll
[test] llvm/test/: change llvm-objdump single-dash long options to double-dash options
2020-03-15 17:46:23 -07:00
compress.ll
[test] llvm/test/: change llvm-objdump single-dash long options to double-dash options
2020-03-15 17:46:23 -07:00
copysign-casts.ll
[LegalizeTypes][RISCV] Soften FCOPYSIGN operand
2019-11-26 15:22:55 +00:00
disable-tail-calls.ll
…
disjoint.ll
[RISCV] Add InstrInfo areMemAccessesTriviallyDisjoint hook
2019-11-05 09:39:06 +00:00
div.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-arith.ll
[RISCV] Select +0.0 immediate using fmv.{w,d}.x / fcvt.d.w
2020-03-20 09:42:24 +00:00
double-bitmanip-dagcombines.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-br-fcmp.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-calling-conv.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-convert.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-fcmp.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-frem.ll
…
double-imm.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-intrinsics.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-isnan.ll
[RISCV] Add patterns for checking isnan
2020-05-02 15:01:04 +01:00
double-mem.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-previous-failure.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-select-fcmp.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
double-stack-spill-restore.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
dwarf-eh.ll
…
exception-pointer-register.ll
[RISCV] Fix wrong CFI directives
2019-11-14 18:29:50 +00:00
fastcc-float.ll
[RISCV] Support fast calling convention
2019-10-15 02:04:29 +00:00
fastcc-int.ll
[RISCV] Support fast calling convention
2019-10-15 02:04:29 +00:00
fixups-diff.ll
…
fixups-relax-diff.ll
…
float-arith.ll
[RISCV] Select +0.0 immediate using fmv.{w,d}.x / fcvt.d.w
2020-03-20 09:42:24 +00:00
float-bit-preserving-dagcombines.ll
…
float-bitmanip-dagcombines.ll
…
float-br-fcmp.ll
[RISCV] Select +0.0 immediate using fmv.{w,d}.x / fcvt.d.w
2020-03-20 09:42:24 +00:00
float-convert.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
float-fcmp.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
float-frem.ll
…
float-imm.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
float-intrinsics.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
float-isnan.ll
[RISCV] Add patterns for checking isnan
2020-05-02 15:01:04 +01:00
float-mem.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
float-select-fcmp.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
flt-rounds.ll
…
fp16-promote.ll
[RISCV] Add support for half-precision floats
2019-10-25 14:02:02 +01:00
fp128.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
fp-imm.ll
[RISCV] Select +0.0 immediate using fmv.{w,d}.x / fcvt.d.w
2020-03-20 09:42:24 +00:00
frame-info.ll
[RISCV][NFC] Fix use of missing attribute groups in tests
2019-12-23 15:39:04 +00:00
frame.ll
[RISCV][NFC] Fix use of missing attribute groups in tests
2019-12-23 15:39:04 +00:00
frameaddr-returnaddr.ll
…
get-register-invalid.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
get-register-noreserve.ll
[RISCV] Implement the TargetLowering::getRegisterByName hook
2019-11-04 11:23:54 +00:00
get-register-reserve.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
get-setcc-result-type.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
hoist-global-addr-base.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
i32-icmp.ll
[RISCV] Optimize seteq/setne pattern expansions for better code size
2020-02-11 22:45:15 +08:00
imm-cse.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
imm.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
indirectbr.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
init-array.ll
…
inline-asm-abi-names.ll
[RISCV] Allow ABI Names in Inline Assembly Constraints
2019-08-08 14:59:16 +00:00
inline-asm-clobbers.ll
…
inline-asm-d-abi-names.ll
[RISCV] Allow ABI Names in Inline Assembly Constraints
2019-08-08 14:59:16 +00:00
inline-asm-d-constraint-f.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
inline-asm-f-abi-names.ll
[RISCV] Allow ABI Names in Inline Assembly Constraints
2019-08-08 14:59:16 +00:00
inline-asm-f-constraint-f.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
inline-asm-i-constraint-i1.ll
…
inline-asm-invalid.ll
…
inline-asm.ll
[RISCV] Fix test for inline asm z constraint modifier
2020-01-15 13:50:50 +00:00
interrupt-attr-args-error.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
interrupt-attr-callee.ll
[RISCV] Correct the CallPreservedMask for the function call in an interrupt handler
2020-02-15 09:14:04 +08:00
interrupt-attr-invalid.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
interrupt-attr-nocall.ll
Migrate function attribute "no-frame-pointer-elim" to "frame-pointer"="all" as cleanups after D56351
2019-12-24 15:57:33 -08:00
interrupt-attr-ret-error.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
interrupt-attr.ll
Migrate function attribute "no-frame-pointer-elim" to "frame-pointer"="all" as cleanups after D56351
2019-12-24 15:57:33 -08:00
jumptable.ll
…
large-stack.ll
[RISCV] Fix wrong CFI directives
2019-11-14 18:29:50 +00:00
legalize-fneg.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
lit.local.cfg
…
lsr-legaladdimm.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
machineoutliner.mir
[RISCV] Enable the machine outliner for RISC-V
2019-12-19 16:41:53 +00:00
mattr-invalid-combination.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
mem64.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
mem.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
mir-target-flags.ll
[RISCV] Fix mir-target-flags.ll
2019-12-09 13:51:08 +00:00
module-target-abi2.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
module-target-abi.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
mul.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
musttail-call.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
option-nopic.ll
[RISCV][AsmParser] Implement .option (no)pic
2020-04-17 12:08:30 +00:00
option-norelax.ll
[llvm-objdump] -d: print 00000000 <foo>: instead of 00000000 foo:
2020-03-05 18:05:28 -08:00
option-norvc.ll
[test] llvm/test/: change llvm-objdump single-dash long options to double-dash options
2020-03-15 17:46:23 -07:00
option-pic.ll
[RISCV][AsmParser] Implement .option (no)pic
2020-04-17 12:08:30 +00:00
option-relax.ll
[llvm-objdump] -d: print 00000000 <foo>: instead of 00000000 foo:
2020-03-05 18:05:28 -08:00
option-rvc.ll
[test] llvm/test/: change llvm-objdump single-dash long options to double-dash options
2020-03-15 17:46:23 -07:00
pic-models.ll
…
pr40333.ll
…
prefetch.ll
…
readcyclecounter.ll
…
rem.ll
…
remat.ll
[RISCV][NFC] Fix use of missing attribute groups in tests
2019-12-23 15:39:04 +00:00
reserved-reg-errors.ll
[RISCV] Add support for -ffixed-xX flags
2019-10-22 21:25:01 +01:00
reserved-regs.ll
[RISCV] Add support for -ffixed-xX flags
2019-10-22 21:25:01 +01:00
rotl-rotr.ll
…
rv32e.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
rv32i-rv64i-float-double.ll
[RISCV] Avoid generating AssertZext for LP64 ABI when lowering floating LibCall
2019-08-28 23:40:37 +00:00
rv64-large-stack.ll
[RISCV] Split SP adjustment to reduce the offset of callee saved register spill and restore
2019-10-04 02:00:57 +00:00
rv64d-double-convert.ll
…
rv64f-float-convert.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
rv64i-complex-float.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
rv64i-exhaustive-w-insts.ll
[RISCV] Custom legalize i32 operations for RV64 to reduce signed extensions
2019-08-06 00:24:00 +00:00
rv64i-single-softfloat.ll
[RISCV] Avoid generating AssertZext for LP64 ABI when lowering floating LibCall
2019-08-28 23:40:37 +00:00
rv64i-tricky-shifts.ll
…
rv64i-w-insts-legalization.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
rv64m-exhaustive-w-insts.ll
[RISCV] Custom legalize i32 operations for RV64 to reduce signed extensions
2019-08-06 00:24:00 +00:00
rv64m-w-insts-legalization.ll
[RISCV] Custom legalize i32 operations for RV64 to reduce signed extensions
2019-08-06 00:24:00 +00:00
saverestore.ll
[RISCV] Add support for save/restore of callee-saved registers via libcalls
2020-02-11 21:23:03 +00:00
sdata-limit-0.ll
…
sdata-limit-4.ll
…
sdata-limit-8.ll
…
sdata-local-sym.ll
…
select-cc.ll
…
select-const.ll
[RISCV] Implement convertSelectOfConstantsToMath
2020-05-02 15:05:57 +01:00
select-optimize-multiple.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
select-optimize-multiple.mir
[Alignment] Use llvm::Align in MachineFunction and TargetLowering - fixes mir parsing
2019-09-11 11:16:48 +00:00
setcc-logic.ll
[RISCV] Optimize seteq/setne pattern expansions for better code size
2020-02-11 22:45:15 +08:00
sext-zext-trunc.ll
…
shift-masked-shamt.ll
…
shifts.ll
Reland [MachineCopyPropagation] Extend MCP to do trivial copy backward propagation.
2019-12-05 14:32:11 +08:00
shrinkwrap.ll
[RISCV] Add support for save/restore of callee-saved registers via libcalls
2020-02-11 21:23:03 +00:00
split-offsets.ll
[RISCV] Fix wrong CFI directives
2019-11-14 18:29:50 +00:00
split-sp-adjust.ll
[RISCV] Split SP adjustment to reduce the offset of callee saved register spill and restore
2019-10-04 02:00:57 +00:00
srem-lkk.ll
[RISCV][NFC] Add nounwind to LKK test functions
2019-11-11 09:51:37 +00:00
srem-vector-lkk.ll
[TargetLowering] SimplifyDemandedBits - Remove ashr if all our demandedbits already match the sign bit
2020-01-25 17:36:46 +00:00
stack-realignment-with-variable-sized-objects.ll
[RISCV] Handle variable sized objects with the stack need to be realigned
2019-11-16 12:39:53 +08:00
stack-realignment.ll
[RISCV] Split SP adjustment to reduce the offset of callee saved register spill and restore
2019-10-04 02:00:57 +00:00
subtarget-features-std-ext.ll
[RISCV] Support ABI checking with per function target-features
2020-01-22 08:12:28 -08:00
tail-calls.ll
[RISCV] Implement mayBeEmittedAsTailCall for tail call optimization
2020-02-18 23:56:42 +08:00
target-abi-invalid.ll
…
target-abi-valid.ll
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
thread-pointer.ll
[RISCV] Support llvm.thread.pointer
2020-03-27 17:30:12 -07:00
tls-models.ll
[RISCV] Don't force Local Exec TLS for non-PIC
2019-12-03 22:04:54 +00:00
umulo-128-legalisation-lowering.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00
urem-lkk.ll
[RISCV][NFC] Add nounwind to LKK test functions
2019-11-11 09:51:37 +00:00
urem-vector-lkk.ll
[RISCV][NFC] Add nounwind to LKK test functions
2019-11-11 09:51:37 +00:00
vararg.ll
[SelectionDAG] Fix usage of Align constructing MachineMemOperands.
2020-04-15 13:01:41 -07:00
verify-instr.mir
Revert "Revert "Reland "[Support] make report_fatal_error abort instead of exit"""
2020-02-13 10:16:06 -08:00
wide-mem.ll
…
zext-with-load-is-free.ll
[RISCV] Switch to the Machine Scheduler
2019-09-17 11:15:35 +00:00