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[PowerPC] Disable fast-isel for existing -O0 tests for PowerPC.

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This is a preliminary patch for fast instruction selection on
PowerPC.  Code generation can differ between DAG isel and fast isel.
Existing tests that specify -O0 were written to expect DAG isel.  Make
this explicit by adding -fast-isel=false to the tests.

In some cases specifying -fast-isel=false produces different code even
when there isn't a fast instruction selector specified.  This is
because TM.Options.EnableFastISel = 1 at -O0 whether or not a FastISel
object exists.  Thus disabling fast isel can actually produce less
conservative code.  Because of this, some of the expected code
generation in the -O0 tests needs to be adjusted.

In particular, handling of function arguments is less conservative
with -fast-isel=false (see isOnlyUsedInEntryBlock() in
SelectionDAGBuilder.cpp).  This results in fewer stack accesses and,
in some cases, reduced stack size as uselessly loaded values are no
longer stored back to spill locations in the stack.

No functional change with this patch; test case adjustments only.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Schmidt 2013-06-13 20:23:34 +00:00
parent 2948e693cb
commit 11729224bf
10 changed files with 31 additions and 34 deletions
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10
test/CodeGen/PowerPC/anon_aggr.ll
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@ -1,4 +1,4 @@
; RUN: llc -O0 -mcpu=pwr7 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
; RUN: llc -O0 -mcpu=pwr7 -mtriple=powerpc64-unknown-linux-gnu -fast-isel=false < %s | FileCheck %s
; RUN: llc -O0 -mcpu=g4 -mtriple=powerpc-apple-darwin8 < %s | FileCheck -check-prefix=DARWIN32 %s
; RUN: llc -O0 -mcpu=ppc970 -mtriple=powerpc64-apple-darwin8 < %s | FileCheck -check-prefix=DARWIN64 %s
@ -22,8 +22,8 @@ unequal:
; CHECK: func1:
; CHECK: cmpld {{[0-9]+}}, 4, 5
; CHECK: std 4, -[[OFFSET1:[0-9]+]]
; CHECK: std 5, -[[OFFSET2:[0-9]+]]
; CHECK-DAG: std 4, -[[OFFSET1:[0-9]+]]
; CHECK-DAG: std 5, -[[OFFSET2:[0-9]+]]
; CHECK: ld 3, -[[OFFSET1]](1)
; CHECK: ld 3, -[[OFFSET2]](1)
@ -65,8 +65,8 @@ unequal:
; CHECK: addi [[REG1:[0-9]+]], 1, 64
; CHECK: ld [[REG2:[0-9]+]], 8([[REG1]])
; CHECK: cmpld {{[0-9]+}}, 4, [[REG2]]
; CHECK: std [[REG2]], -[[OFFSET1:[0-9]+]]
; CHECK: std 4, -[[OFFSET2:[0-9]+]]
; CHECK-DAG: std [[REG2]], -[[OFFSET1:[0-9]+]]
; CHECK-DAG: std 4, -[[OFFSET2:[0-9]+]]
; CHECK: ld 3, -[[OFFSET2]](1)
; CHECK: ld 3, -[[OFFSET1]](1)

4
test/CodeGen/PowerPC/emptystruct.ll
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@ -1,4 +1,4 @@
; RUN: llc -mcpu=pwr7 -O0 < %s | FileCheck %s
; RUN: llc -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s
; This tests correct handling of empty aggregate parameters and return values.
; An empty parameter passed by value does not consume a protocol register or
@ -27,7 +27,6 @@ entry:
; CHECK: callee:
; CHECK: std 4,
; CHECK: std 3,
; CHECK-NOT: std 5,
; CHECK-NOT: std 6,
; CHECK: blr
@ -45,7 +44,6 @@ entry:
; CHECK: caller:
; CHECK: addi 4,
; CHECK: std 3,
; CHECK-NOT: std 5,
; CHECK-NOT: std 6,
; CHECK: bl callee

2
test/CodeGen/PowerPC/floatPSA.ll
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@ -1,4 +1,4 @@
; RUN: llc -O0 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
; RUN: llc -O0 -mtriple=powerpc64-unknown-linux-gnu -fast-isel=false < %s | FileCheck %s
; This verifies that single-precision floating point values that can't
; be passed in registers are stored in the rightmost word of the parameter

28
test/CodeGen/PowerPC/jaggedstructs.ll
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@ -1,4 +1,4 @@
; RUN: llc -mcpu=pwr7 -O0 < %s | FileCheck %s
; RUN: llc -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s
; This tests receiving and re-passing parameters consisting of structures
; of size 3, 5, 6, and 7. They are to be found/placed right-adjusted in
@ -18,25 +18,25 @@ entry:
ret void
}
; CHECK: std 6, 216(1)
; CHECK: std 5, 208(1)
; CHECK: std 4, 200(1)
; CHECK: std 3, 192(1)
; CHECK: lbz {{[0-9]+}}, 199(1)
; CHECK: lhz {{[0-9]+}}, 197(1)
; CHECK: std 6, 184(1)
; CHECK: std 5, 176(1)
; CHECK: std 4, 168(1)
; CHECK: std 3, 160(1)
; CHECK: lbz {{[0-9]+}}, 167(1)
; CHECK: lhz {{[0-9]+}}, 165(1)
; CHECK: stb {{[0-9]+}}, 55(1)
; CHECK: sth {{[0-9]+}}, 53(1)
; CHECK: lbz {{[0-9]+}}, 207(1)
; CHECK: lwz {{[0-9]+}}, 203(1)
; CHECK: lbz {{[0-9]+}}, 175(1)
; CHECK: lwz {{[0-9]+}}, 171(1)
; CHECK: stb {{[0-9]+}}, 63(1)
; CHECK: stw {{[0-9]+}}, 59(1)
; CHECK: lhz {{[0-9]+}}, 214(1)
; CHECK: lwz {{[0-9]+}}, 210(1)
; CHECK: lhz {{[0-9]+}}, 182(1)
; CHECK: lwz {{[0-9]+}}, 178(1)
; CHECK: sth {{[0-9]+}}, 70(1)
; CHECK: stw {{[0-9]+}}, 66(1)
; CHECK: lbz {{[0-9]+}}, 223(1)
; CHECK: lhz {{[0-9]+}}, 221(1)
; CHECK: lwz {{[0-9]+}}, 217(1)
; CHECK: lbz {{[0-9]+}}, 191(1)
; CHECK: lhz {{[0-9]+}}, 189(1)
; CHECK: lwz {{[0-9]+}}, 185(1)
; CHECK: stb {{[0-9]+}}, 79(1)
; CHECK: sth {{[0-9]+}}, 77(1)
; CHECK: stw {{[0-9]+}}, 73(1)

4
test/CodeGen/PowerPC/mcm-4.ll
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@ -1,5 +1,5 @@
; RUN: llc -mcpu=pwr7 -O0 -code-model=medium <%s | FileCheck -check-prefix=MEDIUM %s
; RUN: llc -mcpu=pwr7 -O0 -code-model=large <%s | FileCheck -check-prefix=LARGE %s
; RUN: llc -mcpu=pwr7 -O0 -code-model=medium -fast-isel=false <%s | FileCheck -check-prefix=MEDIUM %s
; RUN: llc -mcpu=pwr7 -O0 -code-model=large -fast-isel=false <%s | FileCheck -check-prefix=LARGE %s
; Test correct code generation for medium and large code model
; for loading a value from the constant pool (TOC-relative).

4
test/CodeGen/PowerPC/mcm-obj.ll
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@ -1,6 +1,6 @@
; RUN: llc -O0 -mcpu=pwr7 -code-model=medium -filetype=obj %s -o - | \
; RUN: llc -O0 -mcpu=pwr7 -code-model=medium -filetype=obj -fast-isel=false %s -o - | \
; RUN: llvm-readobj -r | FileCheck -check-prefix=MEDIUM %s
; RUN: llc -O0 -mcpu=pwr7 -code-model=large -filetype=obj %s -o - | \
; RUN: llc -O0 -mcpu=pwr7 -code-model=large -filetype=obj -fast-isel=false %s -o - | \
; RUN: llvm-readobj -r | FileCheck -check-prefix=LARGE %s
; FIXME: When asm-parse is available, could make this an assembly test.

2
test/CodeGen/PowerPC/ppc64-align-long-double.ll
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@ -1,4 +1,4 @@
; RUN: llc -mcpu=pwr7 -O0 < %s | FileCheck %s
; RUN: llc -mcpu=pwr7 -O0 -fast-isel=false < %s | FileCheck %s
; Verify internal alignment of long double in a struct. The double
; argument comes in in GPR3; GPR4 is skipped; GPRs 5 and 6 contain

2
test/CodeGen/PowerPC/structsinmem.ll
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@ -1,4 +1,4 @@
; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim < %s | FileCheck %s
; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim -fast-isel=false < %s | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"

2
test/CodeGen/PowerPC/structsinregs.ll
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@ -1,4 +1,4 @@
; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim < %s | FileCheck %s
; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim -fast-isel=false < %s | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"

7
test/CodeGen/PowerPC/vrspill.ll
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@ -1,5 +1,5 @@
; RUN: llc -O0 -mtriple=powerpc-unknown-linux-gnu -mattr=+altivec -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -O0 -mtriple=powerpc64-unknown-linux-gnu -mattr=+altivec -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -O0 -mtriple=powerpc-unknown-linux-gnu -mattr=+altivec -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -O0 -mtriple=powerpc64-unknown-linux-gnu -mattr=+altivec -verify-machineinstrs -fast-isel=false < %s | FileCheck %s
; This verifies that we generate correct spill/reload code for vector regs.
@ -13,7 +13,6 @@ entry:
ret void
}
; CHECK: stvx 2, 1,
; CHECK: lvx 2, 1,
; CHECK: stvx 2,
declare void @foo(i32*)