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runtime: arm5, fix large-offset floating-point stores
The code sequence for large-offset floating-point stores includes adding the base pointer to r11. Make sure we can interpret that instruction correctly. Fixes build. Fixes #15440 Change-Id: I7fe5a4a57e08682967052bf77c54e0ec47fcb53e Reviewed-on: https://go-review.googlesource.com/22440 Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
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@ -168,14 +168,15 @@ execute:
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}
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return 1
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}
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if i == 0xe08bb00d {
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// add sp to r11.
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// might be part of a large stack offset address
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if i&0xfffffff0 == 0xe08bb000 {
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r := i & 0xf
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// add r to r11.
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// might be part of a large offset address calculation
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// (or might not, but again no harm done).
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regs[11] += regs[13]
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regs[11] += regs[r]
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if fptrace > 0 {
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print("*** cpu R[11] += R[13] ", hex(regs[11]), "\n")
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print("*** cpu R[11] += R[", r, "] ", hex(regs[11]), "\n")
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}
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return 1
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}
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@ -82,3 +82,47 @@ func TestUsplit(t *testing.T) {
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}
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}
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}
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//go:noinline
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func armFloatWrite(a *[129]float64) {
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// This used to miscompile on arm5.
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// The offset is too big to fit in a load.
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// So the code does:
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// ldr r0, [sp, #8]
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// bl 6f690 <_sfloat>
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// ldr fp, [pc, #32] ; (address of 128.0)
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// vldr d0, [fp]
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// ldr fp, [pc, #28] ; (1024)
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// add fp, fp, r0
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// vstr d0, [fp]
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// The software floating-point emulator gives up on the add.
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// This causes the store to not work.
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// See issue 15440.
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a[128] = 128.0
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}
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func TestArmFloatBigOffsetWrite(t *testing.T) {
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var a [129]float64
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for i := 0; i < 128; i++ {
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a[i] = float64(i)
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}
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armFloatWrite(&a)
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for i, x := range a {
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if x != float64(i) {
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t.Errorf("bad entry %d:%f\n", i, x)
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}
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}
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}
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//go:noinline
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func armFloatRead(a *[129]float64) float64 {
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return a[128]
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}
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func TestArmFloatBigOffsetRead(t *testing.T) {
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var a [129]float64
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for i := 0; i < 129; i++ {
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a[i] = float64(i)
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}
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if x := armFloatRead(&a); x != 128.0 {
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t.Errorf("bad value %f\n", x)
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}
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}
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