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llvm-6502/test/CodeGen/Mips/longbranch.ll
Daniel Sanders fe2b8b1960 [mips] Promote i32 arguments to i64 for the N32/N64 ABI and fix <64-bit structs... 
Summary:
... and after all that refactoring, it's possible to distinguish softfloat
floating point values from integers so this patch no longer breaks softfloat to
do it.

Remove direct handling of i32's in the N32/N64 ABI by promoting them to
i64. This more closely reflects the ABI documentation and also fixes
problems with stack arguments on big-endian targets.

We now rely on signext/zeroext annotations (already generated by clang) and
the Assert[SZ]ext nodes to avoid the introduction of unnecessary sign/zero
extends.

It was not possible to convert three tests to use signext/zeroext. These tests
are bswap.ll, ctlz-v.ll, ctlz-v.ll. It's not possible to put signext on a
vector type so we just accept the sign extends here for now. These tests don't
pass the vectors the same way clang does (clang puts multiple elements in the
same argument, these map 1 element to 1 argument) so we don't need to worry too
much about it.

With this patch, all known N32/N64 bugs should be fixed and we now pass the
first 10,000 tests generated by ABITest.py.

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D6117


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221534 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-07 16:54:21 +00:00

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; RUN: llc -march=mipsel < %s | FileCheck %s
; RUN: llc -march=mipsel -force-mips-long-branch -O3 < %s \
; RUN: | FileCheck %s -check-prefix=O32
; RUN: llc -march=mips64el -mcpu=mips4 -mattr=n64 -force-mips-long-branch -O3 \
; RUN: < %s | FileCheck %s -check-prefix=N64
; RUN: llc -march=mips64el -mcpu=mips64 -mattr=n64 -force-mips-long-branch -O3 \
; RUN: < %s | FileCheck %s -check-prefix=N64
; RUN: llc -march=mipsel -mcpu=mips32r2 -mattr=micromips \
; RUN: -force-mips-long-branch -O3 < %s | FileCheck %s -check-prefix=MICROMIPS
; RUN: llc -mtriple=mipsel-none-nacl -force-mips-long-branch -O3 < %s \
; RUN: | FileCheck %s -check-prefix=NACL
@x = external global i32
define void @test1(i32 signext %s) {
entry:
%cmp = icmp eq i32 %s, 0
br i1 %cmp, label %end, label %then
then:
store i32 1, i32* @x, align 4
br label %end
end:
ret void
; First check the normal version (without long branch). beqz jumps to return,
; and fallthrough block stores 1 to global variable.
; CHECK: lui $[[R0:[0-9]+]], %hi(_gp_disp)
; CHECK: addiu $[[R0]], $[[R0]], %lo(_gp_disp)
; CHECK: beqz $4, $[[BB0:BB[0-9_]+]]
; CHECK: addu $[[GP:[0-9]+]], $[[R0]], $25
; CHECK: lw $[[R1:[0-9]+]], %got(x)($[[GP]])
; CHECK: addiu $[[R2:[0-9]+]], $zero, 1
; CHECK: sw $[[R2]], 0($[[R1]])
; CHECK: $[[BB0]]:
; CHECK: jr $ra
; CHECK: nop
; Check the MIPS32 version. Check that branch logic is inverted, so that the
; target of the new branch (bnez) is the fallthrough block of the original
; branch. Check that fallthrough block of the new branch contains long branch
; expansion which at the end indirectly jumps to the target of the original
; branch.
; O32: lui $[[R0:[0-9]+]], %hi(_gp_disp)
; O32: addiu $[[R0]], $[[R0]], %lo(_gp_disp)
; O32: bnez $4, $[[BB0:BB[0-9_]+]]
; O32: addu $[[GP:[0-9]+]], $[[R0]], $25
; Check for long branch expansion:
; O32: addiu $sp, $sp, -8
; O32-NEXT: sw $ra, 0($sp)
; O32-NEXT: lui $1, %hi(($[[BB2:BB[0-9_]+]])-($[[BB1:BB[0-9_]+]]))
; O32-NEXT: bal $[[BB1]]
; O32-NEXT: addiu $1, $1, %lo(($[[BB2]])-($[[BB1]]))
; O32-NEXT: $[[BB1]]:
; O32-NEXT: addu $1, $ra, $1
; O32-NEXT: lw $ra, 0($sp)
; O32-NEXT: jr $1
; O32-NEXT: addiu $sp, $sp, 8
; O32: $[[BB0]]:
; O32: lw $[[R1:[0-9]+]], %got(x)($[[GP]])
; O32: addiu $[[R2:[0-9]+]], $zero, 1
; O32: sw $[[R2]], 0($[[R1]])
; O32: $[[BB2]]:
; O32: jr $ra
; O32: nop
; Check the MIPS64 version.
; N64: lui $[[R0:[0-9]+]], %hi(%neg(%gp_rel(test1)))
; N64: bnez $4, $[[BB0:BB[0-9_]+]]
; N64: daddu $[[R1:[0-9]+]], $[[R0]], $25
; Check for long branch expansion:
; N64: daddiu $sp, $sp, -16
; N64-NEXT: sd $ra, 0($sp)
; N64-NEXT: daddiu $1, $zero, %hi(($[[BB2:BB[0-9_]+]])-($[[BB1:BB[0-9_]+]]))
; N64-NEXT: dsll $1, $1, 16
; N64-NEXT: bal $[[BB1]]
; N64-NEXT: daddiu $1, $1, %lo(($[[BB2]])-($[[BB1]]))
; N64-NEXT: $[[BB1]]:
; N64-NEXT: daddu $1, $ra, $1
; N64-NEXT: ld $ra, 0($sp)
; N64-NEXT: jr $1
; N64-NEXT: daddiu $sp, $sp, 16
; N64: $[[BB0]]:
; N64: daddiu $[[GP:[0-9]+]], $[[R1]], %lo(%neg(%gp_rel(test1)))
; N64: ld $[[R2:[0-9]+]], %got_disp(x)($[[GP]])
; N64: addiu $[[R3:[0-9]+]], $zero, 1
; N64: sw $[[R3]], 0($[[R2]])
; N64: $[[BB2]]:
; N64: jr $ra
; N64: nop
; Check the microMIPS version.
; MICROMIPS: lui $[[R0:[0-9]+]], %hi(_gp_disp)
; MICROMIPS: addiu $[[R0]], $[[R0]], %lo(_gp_disp)
; MICROMIPS: bnez $4, $[[BB0:BB[0-9_]+]]
; MICROMIPS: addu $[[GP:[0-9]+]], $[[R0]], $25
; Check for long branch expansion:
; MICROMIPS: addiu $sp, $sp, -8
; MICROMIPS-NEXT: sw $ra, 0($sp)
; MICROMIPS-NEXT: lui $1, %hi(($[[BB2:BB[0-9_]+]])-($[[BB1:BB[0-9_]+]]))
; MICROMIPS-NEXT: bal $[[BB1]]
; MICROMIPS-NEXT: addiu $1, $1, %lo(($[[BB2]])-($[[BB1]]))
; MICROMIPS-NEXT: $[[BB1]]:
; MICROMIPS-NEXT: addu $1, $ra, $1
; MICROMIPS-NEXT: lw $ra, 0($sp)
; MICROMIPS-NEXT: jr $1
; MICROMIPS-NEXT: addiu $sp, $sp, 8
; MICROMIPS: $[[BB0]]:
; MICROMIPS: lw $[[R1:[0-9]+]], %got(x)($[[GP]])
; MICROMIPS: addiu $[[R2:[0-9]+]], $zero, 1
; MICROMIPS: sw $[[R2]], 0($[[R1]])
; MICROMIPS: $[[BB2]]:
; MICROMIPS: jr $ra
; MICROMIPS: nop
; Check the NaCl version. Check that sp change is not in the branch delay slot
; of "jr $1" instruction. Check that target of indirect branch "jr $1" is
; bundle aligned.
; NACL: lui $[[R0:[0-9]+]], %hi(_gp_disp)
; NACL: addiu $[[R0]], $[[R0]], %lo(_gp_disp)
; NACL: bnez $4, $[[BB0:BB[0-9_]+]]
; NACL: addu $[[GP:[0-9]+]], $[[R0]], $25
; Check for long branch expansion:
; NACL: addiu $sp, $sp, -8
; NACL-NEXT: sw $ra, 0($sp)
; NACL-NEXT: lui $1, %hi(($[[BB2:BB[0-9_]+]])-($[[BB1:BB[0-9_]+]]))
; NACL-NEXT: bal $[[BB1]]
; NACL-NEXT: addiu $1, $1, %lo(($[[BB2]])-($[[BB1]]))
; NACL-NEXT: $[[BB1]]:
; NACL-NEXT: addu $1, $ra, $1
; NACL-NEXT: lw $ra, 0($sp)
; NACL-NEXT: addiu $sp, $sp, 8
; NACL-NEXT: jr $1
; NACL-NEXT: nop
; NACL: $[[BB0]]:
; NACL: lw $[[R1:[0-9]+]], %got(x)($[[GP]])
; NACL: addiu $[[R2:[0-9]+]], $zero, 1
; NACL: sw $[[R2]], 0($[[R1]])
; NACL: .align 4
; NACL-NEXT: $[[BB2]]:
; NACL: jr $ra
; NACL: nop
}
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